农业资源与环境学报2025，Vol.42Issue(3)：674-682,9.DOI:10.13254/j.jare.2024.0126
粉煤灰、腐植酸和秸秆复合改良红壤初期的水盐运动特征
Characteristics of water and salt movement in soil during the initial stage of composite improvement by fly ash,humic acid,and straw
摘要
Abstract
To investigate the characteristics of water and salt movement in soil during the initial stage of composite improvement,this study employed one-dimensional vertical infiltration experiments to analyze the effects of different proportions of fly ash,humic acid,and straw on the movement of the infiltration wetting front,surface infiltration rate,and salt distribution in composite-improved soil.The results showed that,during the initial stage of composite improvement,the composite amendment significantly reduced the migration rate of the infiltration wetting front,initial surface infiltration rate,and stable surface infiltration rate by 12.56%-54.33%,23.63%-79.03%,and 27.82%-82.19%,respectively,compared with those of soil without composite-improved.The main factor responsible for the reduction in infiltration characteristics was found to be fly ash(P<0.05).Additionally,composite amendment significantly increased soil salinity.Soil salts quickly accumulated at the interface between the amended layer and subsoil with the infiltration water,resulting in the increment of soil salt as 1.10-2.55 times and 0.98-2.71 times in the upper(0-8 cm)and lower(12-20 cm)soil layers,respectively,compared with those of soil without composite-improved.These findings indicate that,during the initial stage of composite improvement,the capacity of soil infiltrate,drainage,and salts discharge are all significantly reduced,which will increase the loss of irrigation water and applied fertilizer by surface runoff,and will increase the risk of soil salinization and environmental water pollution.Therefore,though composite amendment has long-term benefits for improving soil quality,attention should be paid to the adverse effects of amendments on soil during the initial stage of composite improvement,and appropriate adjustments should be made to farmland management practices to mitigate these negative impacts.关键词
土壤改良初期/复合改良剂/一维垂直入渗/水盐运动/Horton入渗模型Key words
initial stage of soil improvement/composite amendment/one-dimensional vertical infiltration/water and salt movement/Horton infiltration model分类
农业科学引用本文复制引用
覃超建,盛丰..粉煤灰、腐植酸和秸秆复合改良红壤初期的水盐运动特征[J].农业资源与环境学报,2025,42(3):674-682,9.基金项目
国家自然科学基金项目(51579020) （51579020）
湖南省自然科学基金项目(2022JJ30602) National Natural Science Foundation of China(51579020) （2022JJ30602）
Hunan Provincial Natural Science Foundation(2022JJ30602) （2022JJ30602）
