华中农业大学学报2025，Vol.44Issue(4)：47-57,11.DOI:10.13300/j.cnki.hnlkxb.2025.04.005
旱改水型耕地红壤团聚体稳定性及影响因素研究
Stability and affecting factors of red soil agglomerates in dryland converted paddy fields
摘要
Abstract
The traditional dryland(HS0),dryland converted paddy field in 1 year(HS1),dryland converted paddy field in 5 year(HS5)and local traditional paddy field(CK)in typical dryland-to-paddy ar-ea of Guangxi Zhuang Autonomous Region were selected to study the effects of dryland converted paddy field(dryland-to-paddy)on soil aggregates in southern red soil areas.Methods including dry screening and wet screening were used to compare and analyze the properties of soil aggregates in the tillage layer.The re-sults showed that the content of soil aggregates>0.25 mm(R>0.25)in mechanical aggregates and water-sta-ble aggregates in HS0,HS1,HS5 and CK was 90.0%,94.0%,95.8%,98.1%and 81.0%,70.6%,76.0%and 95.4%in the traditional arid land and after dryland-to-paddy,with the mean weight diameter(ΦMWD)of 3.35 mm,3.63 mm,3.69 mm,4.73 mm and 2.25 mm,0.94 mm,1.54 mm,4.63 mm,re-spectively.The geometric mean diameter(ΦGMD)of the water-stable aggregates in HS1 decreased by 68%compared with that in HS0.The percentage of aggregate destruction(rPAD)of>0.25 mm aggregate in-creased first and then decreased with the years of dryland-to-paddy compared with that in HS0,with the in-crease in HS1 and HS5 by 61%and 34%,while there was a significant decrease of 76%in CK.The re-sults of structural equation model and random forest analyses indicated that the cation exchange capacity(CEC)and the content of total nitrogen(TN)in soil were the important factors affecting the stability of soil aggregates in the tillage layer of dryland converted paddy fields.关键词
旱改水/红壤/耕地/土壤团聚体/团聚体稳定性/土壤结构Key words
dryland converted paddy fields/red soil/arable land/soil aggregates/stability of aggre-gates/soil structure分类
农业科技引用本文复制引用
袁鹏丽,覃佳宇,周雨茜,龙新路,周勇,江立庚..旱改水型耕地红壤团聚体稳定性及影响因素研究[J].华中农业大学学报,2025,44(4):47-57,11.基金项目
国家自然科学基金项目(32160500) （32160500）
