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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)