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

作     者：ZHAO Fazhu ZHANG Lu SUN Jiao REN Chengjie HAN Xinhui YANG Gaihe PANG Guowei BAI Hongying WANG Jun 

作者机构：College of Urban and Environmental SciencesNorthwest University Shaanxi Land Construction GroupShaanxi LCG Land Project Technology InstituteKey Laboratory of Degraded and Unused Land Consolidation Engineeringthe Ministry of Land and Resources of China Institute of Agricultural Resources and EnvironmentNingxia Academy of Agriculture and Forestry Sciences College of AgronomyNorthwest A&F University 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2017年第27卷第4期

页      面：705-713页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：supported by the National Natural Science Foundation of China(Nos.41601578,41601290,31270484,and 31570440) the Special Fund for Forest Scientific Research in the Public Interest of China(Nos.201304312 and 201304309) the Natural Science Foundation of Northwest University,China(No.15NW03) the Young Talent Fund of University Association for Science and Technology in Shaanxi,China(No.20170302) 

主　　题：dissolved organic C, labile organic C, light fraction organic C, microbial biomass C, particulate organic C 

摘      要：Afforestation is recognized as an important driving force for soil organic C(SOC) dynamics and soil element *** 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 *** 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 *** 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 *** results indicate that changes in SOC fractions are largely driven by soil C:P and N:P ratios at different soil depths after afforestation.