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Table 5 Composition of Jeffrey pine needles following one, two, and six years of decay from initial collection (2009). Values represent mean with one standard error of the mean in parentheses. GRAN = granitic site, META = metamorphic site, N = nitrogen, P = phosphorus, K = potassium.

From: Surface fuel accumulation and decomposition in old-growth pine-mixed conifer forests, northwestern Mexico

Site

Year

Weight (g)

Carbon (%)

N (%)

P (%)

K (%)

GRAN

2009

37.2 (0.1)

49.7 (0.1)

1.11 (0.01)

0.11 (0.0)

0.52 (0.03)

2010

31.7 (0.4)

54.2 (0.1)

1.38 (0.02)

0.10 (0.0)

0.29 (0.03)

2011

29.4 (0.7)

52.1 (0.9)

1.44 (0.05)

0.10 (0.0)

0.23 (0.03)

2015

19.0 (0.9)

53.0 (0.4)

1.97 (0.08)

0.09 (0.0)

0.09 (0.02)

META

2009

37.4 (0.6)

49.2 (0.1)

1.13 (0.02)

0.14 (0.01)

0.55 (0.01)

2010

30.4 (0.2)

54.5 (0.1)

1.28 (0.02)

0.11 (0.00)

0.18 (0.03)

2011

28.1 (0.3)

52.6 (0.3)

1.33 (0.04)

0.10 (0.01)

0.17 (0.02)

2015

18.6 (1.3)

53.2 (0.5)

1.74 (0.05)

0.09 (0.01)

0.09 (0.02)