Chin J Plant Ecol ›› 2017, Vol. 41 ›› Issue (10): 1041-1050.DOI: 10.17521/cjpe.2016.0317
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Guan-Tao CHEN1, Yong PENG1, Jun ZHENG2, Shun LI1, Tian-Chi PENG1, Xi-Rong QIU1, Li-Hua TU1,*()
Online:
2017-10-10
Published:
2017-12-24
Contact:
Li-Hua TU
Guan-Tao CHEN, Yong PENG, Jun ZHENG, Shun LI, Tian-Chi PENG, Xi-Rong QIU, Li-Hua TU. Effects of short-term nitrogen addition on fine root biomass, lifespan and morphology of Castanopsis platyacantha in a subtropical secondary evergreen broad-leaved forest[J]. Chin J Plant Ecol, 2017, 41(10): 1041-1050.
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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2016.0317
土层深度 Soil depth (cm) | pH | 土壤容重 Soil bulk density (g·cm-3) | 有机碳含量 Organic carbon content (g·kg-1) | 全氮含量 Total nitrogen content (g·kg-1) | 全磷含量 Total phosphorus content (g·kg-1) | 全钾含量 Total potassium content (g·kg-1) |
---|---|---|---|---|---|---|
0-10 | 3.19 ± 0.03 | 0.41 ± 0.03 | 121.9 ± 11.7 | 5.80 ± 0.30 | 0.50 ± 0.01 | 13.89 ± 0.92 |
10-40 | 3.76 ± 0.03 | 0.66 ± 0.02 | 26.6 ± 2.5 | 1.51 ± 0.08 | 0.26 ± 0.03 | 17.07 ± 0.82 |
40-70 | 3.97 ± 0.02 | 0.89 ± 0.03 | 12.6 ± 1.2 | 0.82 ± 0.05 | 0.18 ± 0.01 | 19.02 ± 1.17 |
70-100 | 4.03 ± 0.02 | 0.99 ± 0.03 | 7.8 ± 0.8 | 0.57 ± 0.04 | 0.21 ± 0.01 | 19.31 ± 1.26 |
Table 1 Soil physicochemical properties in a secondary evergreen broad-leaved forest, Wawu Mountain (mean ± SE)
土层深度 Soil depth (cm) | pH | 土壤容重 Soil bulk density (g·cm-3) | 有机碳含量 Organic carbon content (g·kg-1) | 全氮含量 Total nitrogen content (g·kg-1) | 全磷含量 Total phosphorus content (g·kg-1) | 全钾含量 Total potassium content (g·kg-1) |
---|---|---|---|---|---|---|
0-10 | 3.19 ± 0.03 | 0.41 ± 0.03 | 121.9 ± 11.7 | 5.80 ± 0.30 | 0.50 ± 0.01 | 13.89 ± 0.92 |
10-40 | 3.76 ± 0.03 | 0.66 ± 0.02 | 26.6 ± 2.5 | 1.51 ± 0.08 | 0.26 ± 0.03 | 17.07 ± 0.82 |
40-70 | 3.97 ± 0.02 | 0.89 ± 0.03 | 12.6 ± 1.2 | 0.82 ± 0.05 | 0.18 ± 0.01 | 19.02 ± 1.17 |
70-100 | 4.03 ± 0.02 | 0.99 ± 0.03 | 7.8 ± 0.8 | 0.57 ± 0.04 | 0.21 ± 0.01 | 19.31 ± 1.26 |
pH | TN (g·kg-1) | NH4+-N (mg·kg-1) | NO3--N (mg·kg-1) | |
---|---|---|---|---|
CK | 3.99 ± 0.05a | 6.62 ± 0.50 | 25.62 ± 5.79 | 25.47 ± 3.90 |
LN | 3.82 ± 0.02ab | 7.19 ± 0.57 | 21.63 ± 6.02 | 26.27 ± 4.65 |
HN | 3.78 ± 0.08b | 7.23 ± 0.35 | 40.15 ± 12.39 | 36.69 ± 4.61 |
单因素方差分析 One-way ANOVA analysis | p = 0.04 | p = 0.62 | p = 0.33 | p = 0.21 |
Table 2 The effect of N addition on surface soil (0-10 cm) chemical element and pH value (mean ± SE)
pH | TN (g·kg-1) | NH4+-N (mg·kg-1) | NO3--N (mg·kg-1) | |
---|---|---|---|---|
CK | 3.99 ± 0.05a | 6.62 ± 0.50 | 25.62 ± 5.79 | 25.47 ± 3.90 |
LN | 3.82 ± 0.02ab | 7.19 ± 0.57 | 21.63 ± 6.02 | 26.27 ± 4.65 |
HN | 3.78 ± 0.08b | 7.23 ± 0.35 | 40.15 ± 12.39 | 36.69 ± 4.61 |
单因素方差分析 One-way ANOVA analysis | p = 0.04 | p = 0.62 | p = 0.33 | p = 0.21 |
中值寿命 Median lifespan | pH | 总氮 Total nitrogen | NH4+-N | NO3--N | 根段长 Root segment length | 根段表面积 Root segment surface-area | |
---|---|---|---|---|---|---|---|
pH | 0.84** | ||||||
总氮 Total nitrogen | -0.54 | -0.57 | |||||
NH4+-N | -0.34 | -0.75* | 0.45 | ||||
NO3--N | -0.41 | -0.67* | 0.54 | 0.72* | |||
根段长 Root segment length | 0.37 | 0.35 | -0.15 | 0.01 | -0.18 | ||
根段表面积 Root segment surface-area | 0.73* | 0.74* | -0.50 | -0.24 | -0.50 | 0.76* | |
根直径 Root diameter | 0.48 | 0.47 | -0.32 | -0.27 | -0.14 | -0.48 | 0.15 |
Table 3 Layer I (0-15 cm) correlation analysis results of Castanopsis platyacantha fine root morphology index, median lifespan, and soil physicochemical property (0-10 cm)
中值寿命 Median lifespan | pH | 总氮 Total nitrogen | NH4+-N | NO3--N | 根段长 Root segment length | 根段表面积 Root segment surface-area | |
---|---|---|---|---|---|---|---|
pH | 0.84** | ||||||
总氮 Total nitrogen | -0.54 | -0.57 | |||||
NH4+-N | -0.34 | -0.75* | 0.45 | ||||
NO3--N | -0.41 | -0.67* | 0.54 | 0.72* | |||
根段长 Root segment length | 0.37 | 0.35 | -0.15 | 0.01 | -0.18 | ||
根段表面积 Root segment surface-area | 0.73* | 0.74* | -0.50 | -0.24 | -0.50 | 0.76* | |
根直径 Root diameter | 0.48 | 0.47 | -0.32 | -0.27 | -0.14 | -0.48 | 0.15 |
Fig. 1 Fine root biomass in different soil layer (mean ± SE). CK, control (0 g·m-2·a-1); LN, low nitrogen addition (5 g·m-2·a-1); HN, high nitrogen addition (15 g·m-2·a-1). p value is the results of one-way ANOVA analysis in different soil layer.
Fig. 2 Effects of nitrogen additions on fine root survival curve. p values are the survival curves significance test result of N addition in the same soil layers. CK, control; LN, low nitrogen; HN, high nitrogen.
Fig. 3 Effects of nitrogen additions on fine root diameter, length and superficial area at different soil layers (mean ± SE). CK, control; LN, low nitrogen; HN, high nitrogen. Text and letters in figure are the result of one-way ANOVA analysis on same morphology indexes in the same soil layers.
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