Effect of Soil C, N and P Stoichiometry on Soil Organic C Fractions After Afforestation

文献类型： 外文期刊

第一作者： Zhao Fazhu

作者： Zhao Fazhu;Pang Guowei;Bai Hongying;Wang Jun;Zhang Lu;Sun Jiao;Ren Chengjie;Han Xinhui;Yang Gaihe

作者机构：

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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