Pedosphere 27(4): 705--713, 2017
ISSN 1002-0160/CN 32-1315/P
©2017 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effect of soil C, N and P stoichiometry on soil organic C fractions after afforestation
ZHAO Fazhu1, ZHANG Lu2, SUN Jiao3, REN Chengjie4, HAN Xinhui4, YANG Gaihe4, PANG Guowei1, BAI Hongying1 and WANG Jun1
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)
4 College of Agronomy, Northwest A&F University, Yangling 712100 (China)
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 in 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 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 afforestation 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 in the 0–10 cm depth were particularly affected by soil C:P ratio, whereas those in the 10–40, 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.
Key Words:  C sequestration, dissolved organic C, labile organic C, light fraction organic C, microbial biomass C, particulate organic C
Citation: Zhao, F., Zhang, L., Sun, J., Ren, C., Han, X., Yang, G., Pang, G., Bai, H. and Wang, J. 2017. Effect of soil C, N and P stoichiometry on soil organic C fractions after afforestation. Pedosphere. 27(4): 705-713.
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