气候智慧型农业措施对中国农田土壤有机碳含量影响的Meta分析OA北大核心CSTPCD

Climate-smart agriculture(CSA)has been implemented widely in agricultural regions worldwide as a new type of agriculture that aims to achieve the three goals of improving agricultural efficiency,enhancing agricultural adaptability,and reducing greenhouse gas emissions.The purpose of this study was to explore the effects of four CSA practices,biochar application,no-tillage,green manure,and straw return,on soil organic carbon(SOC)content in farmland in China,to provide a scientific foundation for SOC management and CSA promotion in the country.The two major literature databases,Web of Science and CNKI,were used to search the data.A total of 470 sets of field experiment data were collected from 78 articles published from 2002 to 2022.Meta-analysis was used to assess the effects of the CSA practices on SOC content and explore its influencing factors.The results showed that the practices of CSA significantly increased SOC content by 18.19%in comparison with the value of conventional tillage.There were differences in the implementation effects of the four CSA practices.Specifically,biochar application was the most effective approach for increasing SOC content(46.67%),followed by straw return(17.08%),green manure(9.32%),and no-tillage(7.34%).Moreover,regional environmental factors(temperature,precipitation,depth of soil,soil pH value,initial value of SOC,etc.)and management methods(duration of experiment and planting pattern)affected the implementation effect of the CSA practices to varying degrees,and the implementation of CSA measures in different regions of China,resulted in different significant changes in SOC content.According to the information above,CSA practices had a significant impact on SOC content in farmland in China,and the effect was tightly linked to climate,soil,management,and location.Hence,in the practice of CSA,it is important to consider the impacts of various factors on the implementation effect fully and then adopt the proper practices and management methods to maximize SOC content.