有机碳流失对土壤侵蚀的响应及其驱动因素:基于Meta分析  

Response of Organic Carbon Loss to Soil Erosion and Its Drivers:A Meta⁃analysis

作　　者：刘小岚 黄金权 齐瑜洁[1] 李威闻 刘纪根 陈燕飞[1] 高绣纺 LIU Xiao-lan;HUANG Jin-quan;QI Yu-jie;LI Wei-wen;LIU Ji-gen;CHEN Yan-fei;GAO Xiu-fang(School of Resources and Environment,Yangtze University,Wuhan 430100,China;Yangtze River Scientific Research Institute,Yangtze River Water Resources Commission,Wuhan 430010,China;Engineering Research Center of Mountain Flood Geological Disaster Prevention and Control,Ministry of Water Resources,Wuhan 430010,China)

机构地区：[1]长江大学资源与环境学院,武汉430100 [2]长江水利委员会长江科学院,武汉430010 [3]水利部山洪地质灾害防治工程技术研究中心,武汉430010

出　　处：《环境科学》2023年第9期5125-5134,共10页Environmental Science

基　　金：国家自然科学基金项目(42077062,U19A2047)。

摘　　要：土壤侵蚀是土壤有机碳(SOC)流失的主要驱动力,在全球碳循环中发挥着重要作用.评估侵蚀作用下SOC流失的主要驱动因素及其影响程度有助于深入理解土壤侵蚀作用下SOC的流失机制.因此,通过Meta分析方法,基于2007~2021年间国内外期刊上发表的24个案例,研究了不同气候因素(气候类型、降雨量和降雨强度)和土壤因素(土壤类型、容重和团聚体粒径)条件下土壤侵蚀对中国SOC流失的影响.结果表明:①与无侵蚀扰动相比,侵蚀作用下SOC含量显著下降(整体下降16.0%),表现出明显的负响应特征;②侵蚀背景下SOC对不同因子的负响应程度为:降雨强度(65.0%)>降雨量(24.3%)>土壤类型(21.4%)>容重(20.2%)>团聚体粒径(16.5%)>气候类型(9.1%);③主成分分析显示,侵蚀背景下气候因素相对于土壤因素是影响SOC流失的主导因素,降雨强度则再次显示为关键影响因子.深入分析我国土壤侵蚀作用下SOC流失特征及其影响因素,为系统理解土壤侵蚀在碳循环中的作用提供了理论参考.Soil erosion is the main driving force of soil organic carbon(SOC)loss and plays an important role in the global carbon cycle.It is helpful to understand the mechanism of SOC loss under soil erosion by evaluating the main driving factors of SOC loss under soil erosion and their influence degree.Therefore,based on 24 cases published in domestic and foreign journals from 2007 to 2021,this study investigated the effects of soil erosion on SOC loss in China under different climatic factors(climate types,rainfall,and rainfall intensity)and soil factors(soil types,bulk density,and aggregate size)by using Meta⁃analysis.The results showed that:①compared with that under no erosion disturbance,the SOC content under erosion decreased significantly(overall decreased 16.0%),showing obvious negative response characteristics.②Under the erosion background,the negative response degree of SOC to different factors was as follows:rainfall intensity(65.0%)>mean annual rainfall(24.3%)>soil types(21.4%)>bulk density(20.2%)>aggregate size(16.5%)>climate types(9.1%).③Principal component analysis showed that climate was the dominant factor affecting SOC loss,and rainfall intensity was again shown to be the key factor.In this study,the characteristics and influencing factors of SOC loss under soil erosion in China were analyzed,which provided theoretical reference for the systematic understanding of the role of soil erosion in the carbon cycle.

关 键 词：土壤侵蚀 土壤有机碳(SOC) 气候因素 土壤因素 META分析 

分 类 号：X171.1[环境科学与工程—环境科学]