Skip to main content

Table 2 Mean (standard error) understory and overstory attributes within ponderosa pine prescribed fire burn units by time since burned for a first entry fire. All percentages represent percent cover measurements. Letters represent significant differences (α ≤ 0.05) between treatment years using PERMANOVA; n = 8 plots. QUGA = Gambel oak, PIPO = ponderosa pine. Data from permanent monitoring plots located at Zion National Park, Utah, USA.

From: Evaluating Prescribed Fire Effectiveness Using Permanent Monitoring Plot Data: A Case Study

  Pre fire Post-fire years since fire
  1 2 5 10
Understory cover (%)      
   Woody shrubs 14.2 (2.7)a 7.3 (1.8)b 6.9 (1.7)b 5.6 (1.0)b 7.5 (2.2)ab
   QUGA 22.4 (4.1) 8.6 (2.9) 19.9 (3.4) 19.4 (3.4) 27.0 (4.4)
   Forb 9.6 (2.8) 8.2 (1.9) 12.6 (3.1) 5.9 (5.0) 7.1 (2.3)
   Perennial graminoids 6.4 (3.1) 5.1 (2.3) 8.1 (3.7) 7.5 (4.1) 5.6 (2.6)
   Total vegetation 55.0 (8.4) 32.1 (5.7) 48.7 (6.0) 38.9 (6.8) 48.0 (3.6)
Overstory and midstory      
   PIPO overstory basal area (m2 ha−1) 20.0 (3.8) 20.0 (3.6) 20.1 (3.6) 21.1 (3.7) 21.1 (3.7)
   PIPO midstory basal area (m2 ha−1) 0.8 (0.4) 0.8 (0.3) 0.8 (0.3) 0.5 (0.2) 0.6 (0.3)
   QUGA overstory density (trees ha−1) 8.8 (5.2) 5.0 (5.0) 6.3 (6.3) 6.3 (6.3) 6.3 (6.3)
   QUGA midstory density (trees ha−1) 655 (447.7) 360 (320.8) 345 (305.8) 335 (306.9) 250 (250)