Table 2 Seasonal dynamics of soil chemical composition and root biomass in a lowland evergreen rain forest in central Amazonia. Time 1 (rainy season); Time 2 (transition into dry season); Time 3 (dry season). Values are averaged data (n = 15 for all except mineral N and root biomass with n = 20) followed by standard error. Letters in superscript indicate statistically significant differences between sampling times as determined by paired t-test and Wilcoxon signed-rank test.
From: Spatio-temporal dynamics of soil bacterial communities as a function of Amazon forest phenology
Time 1 | Time 2 | Time 3 | |
|---|---|---|---|
pH | 3.75 ± 0.06a | 3.87 ± 0.05b | 4.27 ± 0.06c |
NH4+ (μg g−1) | 26.6 ± 1.6a | 17.1 ± 1.2b | 51.8 ± 1.2c |
NO3− (μg g−1) | 2.98 ± 0.3a | 1.93 ± 0.2b | 5.07 ± 0.7c |
PO43− (μg g−1) | 11.21 ± 0.38 | 10.86 ± 0.43 | 10.46 ± 0.4 |
K+ (mmolc kg−1) | 1.36 ± 0.07a | 1.39 ± 0.09a | 1.58 ± 0.11b |
Ca2+ (mmolc kg−1) | 4.31 ± 0.96 | 3.92 ± 0.79 | 3.71 ± 0.7 |
Mg2+ (mmolc kg−1) | 1.72 ± 0.16 | 1.93 ± 0.19 | 1.68 ± 0.09 |
H + Al2+ (mmolc kg−1) | 205.4 ± 15.4a | 193.5 ± 14.9a | 155.9 ± 12.2b |
Organic matter (%) | 7.52 ± 0.49 | 7.68 ± 0.45 | 7.12 ± 0.38 |
CEC (mmolc kg−1) | 213.7 ± 15.8a | 200.8 ± 15.1a | 162.8 ± 12.3b |
Fine roots (Mg ha−1) | 7.03 ± 0.73a | 4.5 ± 0.34b | 4.56 ± 0.27b |
Coarse roots (Mg ha−1) | 2.75 ± 1.27a | 3.29 ± 1.4a | 6.52 ± 1.77b |
