摘要
为探究冬闲绿肥对红壤抵御季节性干旱能力的调节作用,以第四纪红黏土和红砂岩两种母质发育红壤为研究对象,研究了冬闲和冬闲绿肥两种处理对红壤抗旱能力的影响。结果发现,相比冬闲处理,冬闲绿肥处理显著改变了红壤的理化性质,增加了土壤饱和含水量、有效孔隙度、有机碳和全氮含量,降低了土壤容重和凋萎含水量。经过3年的冬闲绿肥处理,第四纪红黏土和红砂岩发育红壤耕层土壤有机碳含量分别提高14.9%和13.8%,全氮含量分别提高16.3%和12.1%。同时,冬闲绿肥处理提高了红壤对季节性干旱的抵御能力,第四纪红黏土和红砂岩发育红壤的旱季有效水含量在0~60 cm土层显著提升,特别是季节性干旱严重的2022年,第四纪红黏土发育红壤20~40 cm土层有效含水量提高幅度达271.5%。冬闲绿肥处理对红壤旱季有效含水量的贡献大于母质和土壤深度,贡献比例分别为55.3%、23.8%和19.4%。该研究为冬闲绿肥处理提升红壤抵御季节性干旱能力提供了直接证据,冬闲绿肥处理通过提升红壤的质量增强了其对季节性干旱的抵御能力,是红壤区值得推荐的土壤抵御季节性干旱的措施。
Given the increasing challenges posed by seasonal drought in regions with red soils,this study aimed to assess the regulatory effects of winter fallow(CK)and winter green manure(CK+GM)on the drought resistance of red soil,focusing on soils derived from two parent materials:Quaternary red clay and red sandstone.The results showed that compared to CK treatment,CK+GM treatment significantly changed the physicochemical properties of the red soil,in which increased soil saturated moisture content,effective porosity,contents of organic carbon and total nitrogen,while reduced soil bulk density and wilting moisture content.After three years of CK+GM treatment,soil organic carbon increased by 14.9%and 13.8%,and total nitrogen increased by 16.3%and 12.1%in soils derived from Quaternary red clay and red sandstone,respectively.Meanwhile,CK+GM treatment improved the resilience of red soil to seasonal drought.Under CK+GM treatment,the effective moisture contents of soils derived from Quaternary red clay and red sandstone were significantly increased in the 0–60 cm soil layer during the dry season.In particular,during the severe seasonal drought in 2022,the effective soil moisture content was increased by 271.5%in the 20–40 cm layer of red soil derived from Quaternary red clay.The contribution of winter green manure treatment to the effective soil moisture content of red soil during the dry season was 55.3%,which was greater than those of the parent material(23.8%)and soil depth(19.4%).This study provides direct evidence that winter green manure treatment enhances the resistance of red soil to seasonal drought by improving soil quality,and demonstrates that it is a recommended measure for soil resistance to seasonal drought in red soil areas.
作者
王烨
高磊
王艳玲
钟湧
彭新华
WANG Ye;GAO Lei;WANG Yanling;ZHONG Yong;PENG Xinhua(College of Ecology and Applied Meteorology,Nanjing University of Information Science and Technology,Nanjing 210044,China;State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 211135,China;Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China)
出处
《土壤》
北大核心
2025年第5期1137-1144,共8页
Soils
基金
井冈山农高区省级“揭榜挂帅”项目(20222-051261)
中国科学院先导A课题(XDA0440202)
国家自然科学基金项目(42077012)资助。
关键词
土壤母质
土壤有效含水量
季节性干旱
土壤培肥
土壤结构
Soil parent material
Effective soil moisture content
Seasonal drought
Soil fertilization
Soil structure
