| 造林恢复植被后土壤的化学计量学特征对其碳组分的影响 |
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| 作者姓名： | ZHAO Fazhu ZHANG Lu SUN Jiao REN Chengjie HAN Xinhui YANG Gaihe PANG Guowei BAI Hongying WANG Jun |
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| 作者单位： | 1College of Urban and Environmental Sciences, Northwest University, Xi’an 710127 (China)
2Shaanxi Land Construction Group, Shaanxi LCG Land Project Technology Institute, Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Land and Resources of China, Xi’an 710075 (China)
3Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002 (China)
4College of Agronomy, Northwest A&F University, Yangling 712100 (China) |
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| 基金项目： | and 31570440)，the Special Fund for Forest Scientific Research in the Public Interest of China(.201304312 and 201304309)，the Natural Science Foundation of Northwest University |
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| 摘 要： | Afforestation is recognized as an important driving force for soil organic C(SOC) dynamics and soil element cycling.To evaluate the relationships between soil C:N:P stoichiometry and SOC fractions,soil C:N:P stoichiometry distributions at 0–200 cm soil depths were analyzed and the contents of SOC fractions were evaluated in 9 typical land-use systems on the Loess Plateau of China.The contents of light fraction organic C,particulate organic C(53,53–2 000,and2 000 μm),labile organic C,microbial biomass C,and dissolved organic C decreased with increasing soil depth and were higher in afforested soil than in slope cropland soil.Compared with the slope cropland,different vegetation types influenced soil C:N,C:P,and N:P ratios,especially when C:P and N:P ratios were significantly higher(P0.05).Moreover,SOC fractions at the 0–10 and 10–40 cm depths were particularly affected by soil C:P ratio,whereas those at the 40–100 and 100–200 cm soil depths were significantly affected(P0.05) by soil N:P ratio.These results indicate that changes in SOC fractions are largely driven by soil C:P and N:P ratios at different soil depths after afforestation.
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| 关 键 词： | dissolved organic C labile organic C light fraction organic C microbial biomass C particulate organic C |
Effect of soil C, N and P stoichiometry on soil organic C fractions after afforestation |
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| ZHAO Fazhu,ZHANG Lu,SUN Jiao,REN Chengjie,HAN Xinhui,YANG Gaihe,PANG Guowei,BAI Hongying,WANG Jun.Effect of soil C, N and P stoichiometry on soil organic C fractions after afforestation[J].Pedosphere,2017,27(4):705-713. |
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| Authors: | ZHAO Fazhu ZHANG Lu SUN Jiao REN Chengjie HAN Xinhui YANG Gaihe PANG Guowei BAI Hongying and WANG Jun |
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| Institution: | 1. College of Urban and Environmental Sciences, Northwest University, Xi'an 710127 China;2. Shaanxi Land Construction Group, Shaanxi LCG Land Project Technology Institute, Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Land and Resources of China, Xi'an 710075 China;3. Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002 China;4. College of Agronomy, Northwest A&F University, Yangling 712100 China |
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| Abstract: | Afforestation is recognized as an important driving force for soil organic C (SOC) dynamics and soil element cycling.To evaluate the relationships between soil C∶N∶P stoichiometry and SOC fractions,soil C∶N∶P stoichiometry distributions at 0-200 cm soil depths were analyzed and the contents of SOC fractions were evaluated in 9 typical land-use systems on the Loess Plateau of China.The contents of light fraction organic C,particulate organic C (＞ 53,53 2000,and ＞ 2000 μm),labile organic C,microbial biomass C,and dissolved organic C decreased with increasing soil depth and were higher in afforested soil than in slope cropland soil.Compared with the slope cropland,different vegetation types influenced soil C∶N,C∶P,and N∶P ratios,especially when C∶P and N∶P ratios were significantly higher (P ＜ 0.05).Moreover,SOC fractions at the 0-10 and 10-40 cm depths were particularly affected by soil C∶P ratio,whereas those at the 40-100 and 100-200 cm soil depths were significantly affected (P ＜ 0.05) by soil N∶P ratio.These results indicate that changes in SOC fractions are largely driven by soil C∶P and N∶P ratios at different soil depths after afforestation. |
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| Keywords: | C sequestration dissolved organic C labile organic C light fraction organic C microbial biomass C particulate organic C |
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