水土保持学报2025，Vol.39Issue(3)：61-69,77,10.DOI:10.13870/j.cnki.stbcxb.2025.03.014
间歇性降雨条件对黑土表层孔隙结构和团聚体周转的影响
Influence of Intermittent Rainfall Conditions on the Pore Structure and Aggregate Turnover of Black Soil Topsoil
摘要
Abstract
[Objective]To investigate the effects of intermittent rainfall conditions on the pore structure and aggregate turnover in the black soil topsoil.[Methods]Black soil topsoil was studied using a combination of rare earth element tracer method,artificial rainfall simulation,and CT scanning research method.The aim was to elucidate the responses of topsoil aggregate characteristics,turnover characteristics of topsoil aggregates,and topsoil pore characteristics to rainfall intensity and frequency.[Results]Under intermittent rainfall conditions,isolated pores were concentrated in the topsoil layer.With the increase of the number of rainfall events,the connected porosity was always greater than the isolated porosity at a rainfall intensity of 40 mm/h,and the maximum values of connected porosity and isolated porosity alternated at a rainfall intensity of 70 mm/h.For large aggregates,as the number of rainfall events increased,the ability of 5-2 mm aggregates to break up into 0.25-0.053 mm aggregates decreased when the connecting porosity decreased,while the ability of 5-2 mm aggregates to break up into<0.053 mm aggregates increased.The opposite was true when the connectivity porosity increased.For small aggregates,as the number of rainfall events increased,the ability of 0.25-0.053 mm aggregates to break up into<0.053 mm aggregates increased,while the ability of<0.053 mm aggregates to aggregate to form 0.25-0.053 mm aggregates gradually decreased.[Conclusion]With the increase in the number of intermittent rainfall,isolated pores tend to concentrate in the topsoil layer.Meanwhile,the ability of large aggregates to break up into small particle sizes gradually increases,while the ability of small aggregates to form large aggregates gradually decreases.关键词
间歇性降雨/孔隙结构/团聚体周转/稀土元素/CT扫描Key words
intermittent rainfall/pore structure/aggregate turnover/rare earth element/CT scanning分类
农业科学引用本文复制引用
雷涵喆,徐金忠,杨庆楠,张晓娅,赵怡凯,李雨,张玉鹏,付玉..间歇性降雨条件对黑土表层孔隙结构和团聚体周转的影响[J].水土保持学报,2025,39(3):61-69,77,10.基金项目
国家自然科学基金项目(42207377) （42207377）
黑土地保护与利用重点实验室开放基金项目(2023HTDGZ-KF-02) （2023HTDGZ-KF-02）
