文献类型： 外文期刊
作者： Zhao Fazhu 1 ; Zhang Lu 2 ; Sun Jiao 3 ; Ren Chengjie 4 ; Han Xinhui 4 ; Yang Gaihe 4 ; Pang Guowei 1 ; Bai Hongying 1 ; Wan 1 ;
作者机构： 1.Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Shaanxi, Peoples R China
2.Minist Land & Resources China, Shaanxi LCG Land Project Technol Inst, Shaanxi Land Construct Grp, Key Lab Degraded & Unused Land Consolidat Engn, Xian 710075, Shaanxi, Peoples R China
3.Ningxia Acad Agr & Forestry Sci, Inst Agr Resources & Environm, Yinchuan 750002, Peoples R China
4.Northwest A&F Univ, Coll Agron, Yangling 712100, Peoples R China
关键词： dissolved organic C;labile organic C;light fraction organic C;microbial biomass C;particulate organic C
期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）
ISSN： 1002-0160
年卷期： 2017 年 27 卷 4 期
页码：
收录情况： SCI
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, and > 2 000 mu m), 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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