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Soil Carbon and Nutrient Recovery after High-Severity Wildfire in Mexico

Fire Ecology volume 11, pages 45–61 (2015)Cite this article

Abstract

Fire severity can increase above historical levels due to factors such as human-derived fire suppression and climate change. Studies about the effects of high-severity fires on soil carbon and nutrients in pine forest at tropical latitudes are still rare. We analyzed the changes in carbon (C), nitrogen (N), and phosphorus (P) contents in the organic layer and the top mineral soil layer in a post-fire chronosequence of Pinus douglasiana Martínez-dominated forest stands in central-western Mexico 8 yr, 28 yr, and 60 yr following a high-severity fire. We found that fire significantly affected the total C, N, and P contents in the organic layer, explained mainly by mass losses. We did not detect differences in C, N, and P contents (Mg ha−1) in the mineral soil, but C and N concentrations (mg g−1) increased with stand age. This can be explained by the high levels of tree mortality that occur during high-severity fires, depleting litter inputs to the soil. We observed a fast recovery of C, N, and P, perhaps resulting from the high capacity of Pinus douglasiana to regenerate following high-severity fires. This can be associated with high metabolic rates of forests in tropical latitudes, which, given their climate and soil conditions, favor higher rates of vegetation growth and, thus, faster rates of organic C inputs and soil organic C accumulation.

Resumen

La severidad de los incendios podría aumentar por encima de los valores históricos como resultado de acciones humanas como la supresión de incendios y el cambio climático. Estudios sobre el efecto de los incendios de alta severidad sobre el carbono y los nutrientes almacenados en suelos de bosques de pino en latitudes tropicales, son escasos. En este estudio analizamos los cambios en los contenidos de carbono (C), nitrógeno (N) y fósforo (P) almacenados en la capa orgánica del suelo y en la capa superficial del suelo mineral, en una crono-secuencia post-incendio en bosques dominados por Pinus douglasiana Martínez, en el centro-occidente de México, 8 años, 28 años, y 60 años después de incendios severos. Los incendios afectaron significativamente los contenidos de C, N y P en la capa orgánica, explicado principalmente por la pérdida de masa. No hubo diferencias en los contenidos de C, N y P (Mg ha−1) en el suelo mineral, mientras que la concentración de C y N (mg g−1) se incrementó con la edad del rodal. Esto puede ser explicado por la alta mortalidad de árboles provocada por los incendios severos, lo que disminuyó la entrada de materia orgánica al suelo. Se registró una rápida recuperación de los contenidos de C, N y P probablemente como resultado de la alta capacidad de Pinus douglasiana para regenerar después de incendios severos. Lo anterior puede estar asociado con las altas tasas metabólicas de los bosques en latitudes tropicales, dadas las condiciones climáticas y de suelo que favorecen mayores tasas de crecimiento de la vegetación y de incorporación y acumulación de C en el suelo.

Introduction

Fire affects forests globally (Agee 1993, Fulé and Covington 1997, Alauzis et al. 2004, Russell-Smith and Yates 2007, Scott et al. 2014), changing various components of these ecosystems, such as carbon and nutrient dynamics (Johnson and Curtis 2001, Carter and Foster 2004). Fire severity can increase with variations in fuels, topography, and weather conditions (Agee 1993), and if the time between fires increases due to factors such as human-derived fire suppression, fuels accumulate and high-severity fire can occur (Fulé and Covington 1997), promoting forest stand replacement processes (Smithwick et al. 2005).

During the nineteenth and most of the twentieth centuries, fire suppression was a generalized management approach in fireprone forests worldwide, including Mexico, to protect timber resources and rural communities (Covington and Moore 1992, Agee 1993, Jardel et al. 2009, Rodríguez-Trejo et al. 2011). Cessation of frequent low-severity fires can increase severity in the next fire event, due to higher biomass accumulation (Agee 1993); in addition to this, global climate change scenarios predict higher temperatures and more droughts in some regions of the world, which may lead to high-severity fire proliferation (Wotton and Flannigan 1993, Westerling et al. 2006). Thus, studies that generate quantitative data that help understand the effects of high-severity fires on soil carbon and nutrients are critical to improve and validate global carbon cycle models and to provide information that supports fire management (Badia et al. 2014).

The organic layer and soil surface represent important sources of nutrients in forest ecosystems (Switzer et al. 1979, Boerner 1982). High-severity fires cause high tree mortality and reach high temperatures (675 °C) in the organic layer, consuming most or all of it (Overby et al. 2003). These fires can transfer considerable heat to the mineral soil, reducing soil carbon (C) and nitrogen (N) stocks (Johnson and Curtis 2001), as these elements volatilize at 200 °C (Neary et al. 1999, Certini 2005). Thus, high-severity fires can negatively impact carbon and nutrient stocks (Neary et al. 1999), decreasing forest productivity (Covington and Moore 1992, Georgiadis 2011, Bento-Goncalves et al. 2012, Powers et al. 2013).

Studies report losses higher than 75% of C and N stocks in the organic layer following high-severity fires (Baird et al. 1999, Neary et al. 1999, Murphy et al. 2006, Neary and Overby 2006). Since phosphorus (P) requires temperatures above 770 °C to volatilize (Neary et al. 2005), only 50% to 70% is lost during combustion in high-severity fires, and the residual P returns to the soil as ash (DeBano and Conrad 1978, Murphy et al. 2006). However, residual phosphorus is vulnerable to hydric or wind erosion, and can be lost rapidly following a fire (Giardina et al. 2000).

Mineral soil layers appear to be less affected by high-severity fire, as only the first 5 cm of depth generally register a small amount of the heat generated during the fire, rarely exceeding 200 °C (Neary et al. 1999, Certini 2005). However, losses of up to 50% of total C and N content in the top mineral soil layer have been documented as a direct result of the combustion of soil organic matter (SOM) in different forest soils (Kutiel and Naveh 1987, Fernández et al. 1997, Baird et al. 1999, Murphy et al. 2006, Martín et al. 2012). Furthermore, subsequent losses of C and N may occur due to increased SOM mineralization and surface soil erosion (Neary et al. 2005). In contrast, total P in soil may increase by 100% to 300% (Kutiel and Naveh 1987, Giardina et al. 2000, Martín et al. 2012), mostly due to ash inputs, organic P mineralization, and solubility of the occluded P as a result of chemical changes to the soil solution (Kutiel and Naveh 1987, García-Oliva and Jaramillo 2011).

Fire causes temporary N and P mineralization in soils (Wan et al. 2001, Certini 2005), increasing the availability of these nutrients for plants and microorganisms (Grove et al. 1986, Kutiel and Naveh 1987, Serrasolsas and Khanna 1995, Murphy et al. 2006). While this contributes to vegetation regeneration, decreased availability in the years following the fire is due to plant assimilation, microbial immobilization, and losses from leaching and erosion (Kutiel and Naveh 1987, Murphy et al. 2006, García-Oliva and Jaramillo 2011, Chen and Shrestha 2012, Guénon et al. 2013).

Post-fire recovery of soil C, N, and P relies on organic matter accumulation, which is tied to forest productivity. Litter accumulates relatively quickly during stand development, reaching a maximum, and remaining relatively constant when inputs equal outputs through litter decomposition (Switzer et al. 1979, Seedre et al. 2011). Smith and Heath (2002) reported that, for several forests in the USA, equilibrium is reached 20 to 80 years following a fire event; recovery time depends on bioclimatic conditions, plant productivity, plant community composition, and post-fire successional dynamics (Switzer et al. 1979, Certini 2005, Smithwick et al. 2005, Gurmesa et al. 2013).

Recovery of C, N, and P in surface mineral soil layers depends on the quantity of organic matter produced by the vegetation established after the fire. Nitrogen recovery can occur at faster rates, even exceeding pre-fire levels, after the establishment of N-fixing plants (Carter and Foster 2004, Johnson et al. 2004). In contrast, soil P recovery depends mainly on ion leaching and occlusion processes within the mineral soil (Kutiel and Naveh 1987); soil texture is a key factor in this process, as clays have a higher capacity to form stable compounds with organic molecules and metals within the soil matrix (Six et al. 2002).

Nonetheless, soil C, N, and P recovery rates following high-severity fires are variable, depending on amounts of organic matter input, which in turn depends on temperature, moisture, soil type, plant species, and nutrient availability (Post and Kwon 2000). For instance, Baird et al. (1999) reported recoveries of 70% of soil organic carbon (SOC), and 32% of soil N within the first year following a high-severity fire in a Pinus ponderosa P. Lawson and P. ponderosa C. Lawson forest. Alauzis et al. (2004) observed that, four years after a fire in Nothofagus pumilio (Poepp. and Endl.) Krasser forests, concentrations of C and N were 52% and 22% lower than in soils without fires. In contrast, LeDuc and Rothstein (2007) observed that in Pinus banksiana Lamb. forests, SOC recovered to pre-fire levels six years after the fire, while N concentrations were 36% lower than those in control stands.

While the immediate effects of high-severity fires on soil properties have been widely documented, their mid- and long-term effects must be further investigated (Wan et al. 2001, Duran et al. 2010). Thus, the objective of this study was to analyze changes of C, N, and P contents in the soil organic layer and the top mineral layer in a chronosequence of Pinus douglasiana Martinez-dominated forests, 8 yr and 28 yr following high-severity fires, and in mature stands without fire for more than 60 years, in central-western Mexico. The hypotheses of this work were as follows: a) C, N, and P in the organic layer and top mineral soil will increase with stand age after a high-severity fire, until they reach values similar to those of mature stands not affected by high-severity fires; and b) the recovery of these elements in the organic layer will be at a faster rate than in the mineral soil layer.

Methods

Study Area

The study was conducted in Las Joyas Research Station (LJRS), located in the central-western portion of the Sierra de Manantlán Biosphere Reserve (SMBR; 19° 14′ 49″ N to 19° 37′ 30″ N, and 104° 14′ 49″ W to 104° 18′ 16″ W). This reserve is a federally protected area located in the state of Jalisco, in central-western Mexico. The station covers 1245 ha, with altitudes that range between 1500 m and 2242 m. Climatic conditions in the study area correspond to the lower montane subtropical moist forest of the Holdridge Life Zone System (Jardel et al. 2004b). Climate in LJRS is classified as sub-humid temperate with summer rains (June to September). Mean annual rainfall is 1826 ±94 mm, and the potential evapotranspiration ratio (potential evapotranspiration:annual precipitation) ranges between 0.5 and 0.6. Mean annual temperature is 15 ±2 °C, ranging from 12.8 °C in January, the coldest month, to 20 °C in May, the warmest month (Jardel et al. 2004b).

The geological substrate of LJRS consists of Tertiary extrusive igneous rocks like basaltic porphyries, basalts, andesitic basalts, and volcanic tuffs. A typical soil catena in the area is a gradient from Inceptisols in mountaintops and upper slopes to Alfisols in lower slopes, and Ultisols in hollows and stream banks (Martínez et al. 1993, Jardel et al. 2004b).

Vegetation cover in the area is a mosaic of pine-oak forests associated with convex landforms (mountaintops and upper slopes), mixed hardwood forests (bosque mesófilo de montaña or cloud forest) in concave landforms (ravines and hollows), mixed pine-hardwood forests in intermediate conditions, and secondary scrub in abandoned agriculture fields (Jardel et al. 2004a). Pinus douglasiana is the dominant species in pine-oak and pine-hardwood forests.

The area has a long history of human influence through slash and burn agriculture in small plots, extensive livestock grazing, and logging; these activities ended in 1987, following the designation of LJRS as part of one of the core zones of SMBR (Jardel 1991). Since biodiversity conservation and restoration are central goals of LJRS, fire suppression is used to encourage the recovery of forest cover through natural regeneration of mixed hardwood forests and mixed pine-hardwood forests.

Most fires in the SMBR occur between April and early June, at the end of the dry season. Fires in the area are relatively small (mean: 189 ha, mode: 50 ha); the most common ignition factors are human-related activities, but fires originated by lightning have also been recorded (Balcázar 2011). Frequent, low-severity, surface fires characterize the historical fire regime in the pine-oak forest, with mean fire intervals ranging from 3 to12 years (Jardel 1991, Llamas-Casillas 2013, Cerano-Paredes et al. 2015), similar to intervals recorded in northwestern Mexico and the southwestern USA (Stephens and Fulé 2005).

Fire suppression in LJRS has led to decreased fire frequencies and accumulation of fuels. Organic matter and woody debris loads for stands without fires in 20 years have been estimated, respectively, at 37 Mg ha−1 to 58 Mg ha−1, and 31 Mg ha−1 to 38 Mg ha−1 (Alvarado-Celestino et al. 2008). These conditions can lead to intense surface fires with high tree mortality (basal area loss >70%) and consumption of most or all of the organic soil layer, caused by smoldering combustion and torching, opening 1 ha to 40 ha patches (as recorded following fires in 1983 and 2003) where succession is restarted (Jardel 1991, Llamas-Casillas 2013). For this study, we selected sites that burned at high-severity in the 1983 and 2003 fires.

Sampling Design

To evaluate the effects of stand-replacing fires on total C, N, and P contained in the soil organic layer and the top mineral layer, we compared stands in a post-fire chronosequence, 8 yr and 28 yr following a fire, with mature stands without high-severity fire for more than 60 years. These three conditions are referred to hereafter as 8 yr old, 28 yr old, and 60 yr old stands, and coincide with three stand development stages: stand initiation, stem exclusion, and understory reinitiation, respectively. The 60 yr old stands had not had low-severity fires since the protected area was established in 1987 and represent late-successional seres in the absence of fire.

Our space-for-time substitution design relies on the assumption that all variation among sites is due to differences in time since disturbance (Yanai et al. 2003); we use a nested sampling design to help account for violations to these assumptions. If sites differed in organic matter and soil C, N, and P due to inherent landscape variability (rather than time after disturbance), we expected to capture that variability in our sample units (Allen et al. 2010). We selected three independent stands for each age group (8 yr old, 28 yr old, and 60 yr old); within each we established three 500 m2 circular plots (12.62 m radius) with a minimum 50 m separation between their centers. Stands were ∼0.5 km to 2.4 km apart to minimize the impact of spatial autocorrelation, and we did not sample stands of the same age class in close proximity to one another.

To minimize the effect of site conditions, stands were located in the same altitudinal range (1950 m to 2150 m), within the same soil type unit (Alfisols), in the mid-portion of north-facing slopes dominated by Pinus douglasiana (>70% basal area) (Table 1). While mean tree density did not differ among stands, tree basal area in the 8 yr old stands was four times lower than in the 28 yr old and 60 yr old stands, an expected effect of high-severity fires, which strongly alters the forest structure (MacKenzie et al. 2004).

Table 1 Tree density and basal area in 8 yr old, 28 yr old, and 60 yr old stands of Pinus douglasiana following high-severity fires in central-western Mexico. Values represent averages for each stand, with standard error in parentheses; a and b show significant differences between means (P < 0.05) with the post-hoc Tukey test.
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Organic Layer and Mineral Soil Sampling

We collected organic and top mineral soil samples in the dry season, between January and June 2011, the highest accumulation period for the organic layer in the region (Covaleda 2008). We divided the organic layer into two sub-layers: litter layer (LL) and duff layer (DL). The LL is formed of plant residues (excluding woody debris) that keep their structure and have an identifiable origin, and the DL includes fragmented and partially decomposed organic matter that has lost its original structure. To measure the mass of the LL and DL sub-layers, we set up four radial lines (12.62 m) originating at plot center, following each cardinal direction (N, E, S, W), and established four sampling points every 3 m (16 points plot−1) where we measured the depth of LL and DL. To obtain LL and DL bulk density samples, we selected three random points in each plot and used a 30 cm × 30 cm metal frame that was pushed into the organic layer to collect LL and DL samples (Ottmar and Andreu 2007 modified by Morfin et al. 2012).

We used a soil core (5 cm diameter) to obtain mineral soil samples from the top 10 cm of this layer, in eight points systematically selected from the 16 points used for LL and DL sampling. Four of the eight samples were used to determine soil bulk density.

Sample Processing and Analyses

Organic layer samples were oven dried at 60 °C and weighed. Half-gram subsamples were ashed in a muffle furnace at 500 °C for 4 h to determine inorganic content; data are reported on an ash-free, 60 °C dry weight basis. The three subsamples were ground and passed through a 40 sieve, and then pooled into one composite sample per plot for chemical analyses.

Mineral soil samples were oven dried at 50 °C. Bulk density samples were weighed and the bulk density of the <2 mm fraction was calculated for each plot; the eight subsamples were pooled into one composite sample per plot, which was then passed through a 100 sieve for all chemical analyses. Soil pH was determined with a potentiometer in water with a 1:2 (wt:vol) soil-solution ratio and in a Cl2Ca 0.01 M solution in a 1:5 (wt:vol) soil-solution ratio. The sand and silt-clay fractions were separated under running water with a 320 sieve.

The LL, DL, and mineral soil samples were analyzed for total concentration of C, N, and P (TC, TN, and TP). The TC was determined by combustion and coulometric detection using an automated CO2 analyzer (UIC model CM5012, Joliet, Illinois, USA). The TN was determined after acid digestion by the macro-Kjendahl method and determined colorimetrically with a 3Bran-Luebbe auto analyzer (SPX, Norderstedt, Germany). The TP was obtained after acid digestion and reduction with ascorbic acid and determined colorimetrically in the same autoanalyzer used for TN.

Statistical Analyses

Mass (Mg ha−1) was calculated as the product of depth (cm) and bulk density (Mg ha−1 cm−1). The TC, TN, and TP contents (Mg ha−1) of the organic and mineral soil layers were calculated as the product of C, N, and P concentration, bulk density, and thickness of the organic and mineral soil layers. Stands were considered treatment replicates.

We tested the normality and homoscedasticity assumptions of all variables with the Kolmogorov-Smirnov and Levene tests, respectively. Data were log-transformed to meet assumptions when required (Zar 1999), although they are reported in their original scale of measurement. We used a nested analysis of variance to compare the effects of high-severity fires on depth; bulk density; mass; TC, TN, and TP concentrations and ratios; and TC, TN, and TP pools in the organic and mineral soil layers in the three stand ages (8, 28 and 60). Stand age (8, 28, and 60) was the main fixed effect, and stands were the nested random effects within each stand age. We compared means with a Tukey test (P = 0.05); Pearson’s correlation coefficient was used to estimate correlations between tree basal area and litter mass, and between tree basal area and soil C concentration. We used simple linear regression to relate soil C concentration to stand age. All statistical analyses were carried out with SPSS version 15 (SPSS Inc., IBM, Armonk, New York, USA).

Results

Litter and Duff Mass

The organic layer depth (LL + DL) differed significantly among ages (F 2.6 = 55.85, P < 0.001), with 5.5 cm in the 8 yr old stands, 16.4 cm in the 28 yr old stands, and 14.5 cm in the 60 yr old stands. The LL was deeper in the 28 yr old stands, while the DL did not show any differences between the 28 yr old and 60 yr old stands (Table 2). Bulk density of LL and DL was lower in the 8 yr old than in the 28 yr old and 60 yr old stands (Table 2).

Table 2 Physical and chemical properties of the litter and duff layers and the top mineral soil in 8 yr old, 28 yr old, and 60 yr old stands of Pinus douglasiana after high-severity fires in central-western Mexico. Values are average (n = 3) with the standard error in parentheses. Letters indicate significant differences between means (P < 0.05) with the post-hoc Tukey test.
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Total mass (LL + DL) in the 8 yr old stands represented 17% of that in the 28 yr old and 60 yr old stands (Figure 1). The LL mass was 4.2 Mg ha−1in the 8 yr old stands, 18.3 Mg ha−1 in the 28 yr old stands, and 12.3 Mg ha−1 in the 60 yr old stands (Figure 1). The DL was 6.2 Mg ha−1 in the 8 yr old stands, representing 15% of that in the 28 yr old and 60 yr old stands (40.5 Mg ha−1 and 42.5 Mg ha−1, respectively; Figure 1). The masses of LL, DL, and total organic layer (LL + DF) were positively related to the basal area of the trees (R2 = 0.35, P ≤ 0.001; R2 = 0.64, P ≤ 0.001; R2 = 0.64, P ≤ 0.001, respectively).

Figure 1
figure 1

Total organic layer mass (LL + DL), litter layer mass (LL), and duff layer mass (DL) (mean ±SE) in 8 yr old, 28 yr old, and 60 yr old stands of Pinus douglasiana after high-severity fires in central-western Mexico.

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C, N, and P Contents of the Organic Layer

The TC, TN, and TP concentrations in the LL and DL were not significantly different among the three stand ages (Table 2). Average TC, TN, and TP concentrations in the LL were 474 ±2 mg g−1, 5.8 ±0.2 mg g−1, and 0.38 ±0.02 mg g−1, respectively. Average concentrations in the DL were 452 ±5 mg g−1, 8.4 ±0.5 mg g−1, and 0.43 ±0.05 mg g−1, respectively. The C:N, N:P, and C:P ratios in LL were relatively constant among the three stand ages. The C:N, N:P, and C:P ratios in DL were not significantly different among the three ages (Table 2).

The TC, TN, and TP contents in both LL and DL were different among ages (Table 3). In the LL, the 8 yr old and 28 yr old stands had the lowest and the highest TC, TN, and TP contents, respectively (Figure 2). In the DL, the 8 yr old stands had lower TC, TN, and TP contents, but these did not change in the 28 yr old and 60 yr old stands (Figure 2).

Figure 2
figure 2

Contents of total C, N, and P in the litter layer (LL), duff layer (DL), and total organic layer (LL + DL) (mean ±SE) in 8 yr old, 28 yr old, and 60 yr old stands of Pinus douglasiana after high-severity fires in central-western Mexico. Bars with different letters show significant differences between means (P < 0.05) with the post-hoc Tukey test.

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Table 3 Nested analysis of variance (F and P) with stand nested within stand age for total C, N, and P (Mg ha−1) in the organic layer and the top mineral soil in 8 yr old, 28 yr old and 60 yr old stands of Pinus douglasiana after high-severity fires in central-western Mexico. Stand age is the fixed effects factor; stand is the nested stand effect, within stand age, as random effects factor.
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Top Mineral Soil Layer

The soil mass was formed of silt and clay particles (74% to 78%) in the three stand ages (8, 28, and 60); soil bulk density was similar among these (Table 2). The pH was moderately acidic (5.3 to 5.6); there were no significant differences in pH among the three stand ages.

Soil C, N, and P Contents

Soil C concentration increased with stand age, being higher in the 60 yr old stands (Table 2). The regression between C concentration and stand age was significant (β = 0.5181, R2 = 0.56, P ≤; 0.001); tree basal area was positively correlated with soil C concentration (R2 = 0.36, P ≤ 0.001).

Soil N concentration was lower in the 8 yr old than the 60 yr old stands; while the concentration in the 28 yr old stands did not differ from the 8 yr old and 60 yr old stands. Soil P concentrations did not differ among the three stand ages. The C:N, N:P, and C:P ratios were relatively constant among the three ages (Table 2).

Soil C contents were not different among ages (Figure 3), but we observed a trend of higher values in the mature stands with 56.24 Mg ha−1 (F 2,6 = 4.7 P = 0.059). The N and P contents were not significant among the three stand ages. The nested effect of the site on soil P content was significant (Table 3).

Figure 3
figure 3

Contents of total C, N, and P in the top mineral soil (mean ±SE) in 8 yr old, 28 yr old, and 60 yr old stands of Pinus douglasiana after high-severity fires in central-western Mexico.

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Discussion

Organic Layer C, N, and P Contents

Concentrations (mg g−1) of C, N, and P in LL and DL were similar after the severe fire in the study sites, which suggests that the type of litter inputs to the system did not change across these successional stages. This was expected, as Pinus douglasiana represents 70% or more of tree basal area in the study sites, and the organic layer was formed mostly of organic compounds produced by this species. Similar results were found by MacKenzie et al. (2004) in a chronosequence of low elevation, second growth Pinus ponderosa-Pseudotsuga menziesii (Mirb.) Franco forest in western Montana, USA, and by Switzer et al. (1979) in a secondary succession of pine forest in eastern Mississippi, USA.

The low C, N, and P contents in the organic layer in the 8 yr old stands suggest that the high-severity fire eliminated most of the organic layer mass, and that its accumulation is slower in the first years following the disturbance. Several studies have reported that organic layer combustion during high-severity fires causes substantial losses of C, N, and P soil contents (for instance, see Baird et al. 1999, Murphy et al. 2006, Neary and Overby 2006). While our study did not evaluate the organic layer loss during fire events, preliminary observations indicate that high-severity fires in LJRS have drastic effects on the organic layer mass, reducing it by 80% to 100% (E.J. Jardel, Universidad de Guadalajara, Autlán de Navarro, Mexico, unpublished data).

Tree basal area in the 8 yr old stands was four times lower than in the 28 yr old and 60 yr old stands—an expected effect of high-severity fires, which strongly alters the forest structure (MacKenzie et al. 2004, Kashian et al. 2006). In our study sites, reduction of tree mass also decreased tree productivity, depleting organic matter inputs to the system. Additionally, forest canopy opening promotes litter decomposition by raising organic layer temperatures (Smithwick et al. 2005, Nave et al. 2011). The positive relationship between organic layer mass and tree basal area suggests that leaf litter production is lower in the youngest sites (8 yr old stands), and that the input of new organic matter to the soil is not at an equilibrium between litterfall production and litter decomposition, which has been confirmed in previous studies (Buschiazzo et al. 2004, Hu et al. 2013).

In our study sites, 28 years after high-severity fire, forest floor mass was similar to that of 60 yr old stands (59 Mg ha−1 and 55 Mg ha−1, respectively), which suggests that litterfall production and organic layer decomposition are at equilibrium approximately 28 years following a high-severity fire. The mass of the organic layer determined through this study is greater than values reported for several pine forests of the USA (25 Mg ha−1 and 28 Mg ha−1 30 years and 50 years after high-severity fires, respectively), but similar to those reported for 50 yr old mixed conifer and broadleaf forests in North America (60 Mg ha−1) (Smith and Heath 2002).

Top Mineral Soil C, N, and P Contents

While it has been reported that high-severity fires can strongly alter the properties of mineral soils (Neary et al. 1999, Certini 2005), our results show that, 8 years after a high-severity fire, bulk density; pH; soil P concentration; C:N, N:P, and C:P ratios; and soil C, N and P contents were similar to those of 60 yr old stands. This suggests that the effect of high-severity fires is temporary and could even decrease shortly after fire, as has been shown by previous studies (Johnson and Curtis 2001, Wan et al. 2001, LeDuc and Rothstein 2007, Nave et al. 2011, Chen and Shrestha 2012).

Soil C and N concentrations in the 8 yr old stands were lower than in the 60 yr old stands, which is consistent with previous studies in temperate forests worldwide that report reduced soil C and N concentrations due to volatilization during high-severity fires (Kutiel and Naveh 1987, Fernández et al. 1997, Baird et al. 1999, Murphy et al. 2006, Rovira et al. 2012). However, recovery times can be different. Alauzis et al. (2004) found that, four years after a fire in Nothofagus pumilio forests, C and N soil concentrations were 52% and 22%, respectively, lower than in control sites. Similarly, LeDuc and Rothstein (2007) found that soil N concentration was 36% lower six years after a severe fire than in control stands in Pinus banksiana-dominated forests.

We detected a positive and statistically significant relationship between tree basal area and soil C concentration, in which the youngest sites had a lower tree basal area and soil C concentration than the older stands (28 yr old and 60 yr old stands), which has also been reported by other studies (Hu et al. 2013, Garcia-Oliva et al. 2014). These results can be explained by the high levels of tree mortality that occur during high-severity forest fires, depleting litter inputs to the mineral soil. Other studies have shown that soil C and N recuperation will depend on increased tree production (Brown and Lugo 1990, Richter et al. 1999).

Soil textures dominated by fine particles increase the amount of C stored in the soil, as clays form stable compounds with organic and metal molecules, favoring C stabilization in the soil (Six et al. 2002, Lützow et al. 2006). Since soils in the study area are dominated by fine particles, we suggest that they play a key role in SOC accumulation, as has been reported for other pine forests in volcanic soils in Mexico (Peña-Ramírez et al. 2009). The SOC yearly accumulation rate (0.52 mg C g−1), shown in the regression between SOC concentration and stand age, reaches concentrations of 85 mg C g−1 60 years after a fire. This value is within the range reported by other authors for conifer forests on volcanic soils in Mexico: 56 mg g−1 to 89 mg g−1 in Pinus montezumae Lamb. forests (Peña-Ramírez et al. 2009) and 73 mg g−1 to 89 mg g−1 in pine-oak forests in southeastern Mexico (Mendoza-Vega et al. 2003). These results suggest that, in the study area, SOC concentrations reach higher values in mature Pinus douglasiana forests without severe fires for at least 60 years.

Post-fire recovery of soil organic matter and nutrient content begins with vegetation regeneration (Certini 2005). Pinus douglasiana forests in LJRS have a high capacity to regenerate following high-severity fires (Jardel 1991, Llamas-Casillas 2009). Our results suggest a rapid recovery of C, N, and P, which may be a result of the high metabolic rate (i.e., high primary productivity and high transformation rate of soil organic matter) of forest ecosystems in tropical latitudes. In sub-humid temperate climates with summer rains, the precipitation corresponds with the growing season, and higher precipitation is associated with increased vegetation growth, organic C inputs, and SOC accumulation.

In the context of increased frequency and severity of wildfire resulting from human-derived fire suppression and climate change, there is a threat of higher soil carbon and nutrient losses, which will reduce forest productivity (Covington and Moore 1992, Georgiadis 2011). Forest managers must consider these potential threats when developing fire and forest management plans, to reduce vulnerability or to enhance forest recovery.

Literature Cited

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Acknowledgements

This study was funded by the Consejo Estatal de Ciencia y Tecnología of the State of Jalisco through the grant Estructura, diversidad y reservorios de carbono de bosques de cañadas en el Pacífico Mexicano (PS-2009-664). The first author received financial support from Consejo National de Ciencia y Tecnologia (scholarship number 272059/222300). R. Velázquez-Durán helped with chemical analyses at the Laboratorio de Biogeoquímica de Suelos, Instituto de Investigaciones en Ecosistemas y Sustentabilidad, Universidad Nacional Autónoma de México. We thank Dr. C. Cortés Montaño for comments on previous drafts of this manuscript.

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Authors and Affiliations

  1. Centro Universitario de la Costa Sur, Universidad de Guadalajara, Avenida Independencia Nacional 151, Autlán de Navarro, Jalisco, México, C.P. 48900

    Shatya D. Quintero-Gradilla

  2. Instituto de Investigaciones en Ecosistemas y Sustentabilidad, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Morelia, Michoacán, México, C.P. 58190

    Felipe García-Oliva

  3. Departamento de Ecología y Recursos Naturales, Centro Universitario de la Costa Sur, Universidad de Guadalajara, Avenida Independencia Nacional 151, Autlán de Navarro, Jalisco, México, C.P. 48900

    Ramón Cuevas-Guzmán & Enrique J. Jardel-Peláez

  4. Instituto de Ecología, Universidad Nacional Autónoma de México, Boulevard Colosio sin número, Hermosillo, Sonora, México, C.P. 83000

    Angelina Martínez-Yrizar

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  1. Shatya D. Quintero-Gradilla
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Quintero-Gradilla, S.D., García-Oliva, F., Cuevas-Guzmán, R. et al. Soil Carbon and Nutrient Recovery after High-Severity Wildfire in Mexico. fire ecol 11, 45–61 (2015). https://doi.org/10.4996/fireecology.1103045

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Keywords

  • biomass
  • duff
  • fire effects
  • litter
  • Mexico
  • nitrogen
  • phosphorus
  • pine forests
  • Sierra de Manantlán