土壤学报2024，Vol.61Issue(3)：813-823,11.DOI:10.11766/trxb202208300482
酸化与富磷对农田土壤硅有效性的影响
Acidification and Phosphorus Enrichment Affect Silicon Availability in Two Farmland Soils
摘要
Abstract
[Objective]Soils and their functions are under threat from acidification.Phosphorus(P)and silicon(Si)mobility and their interactions in soils are sensitive to soil pH.Although Si fertilizer application has been reported to efficiently increase P availability in soils,the responses of Si mobility and availability to soil P enrichment are not well understood,especially in areas of intensive agriculture where soil P accumulation is significant.[Method]This study investigated the effects of P addition and artificial soil acidification on Si sorption and mobility in two typical farmland soils with different available silicon levels(the lower available silicon level,LASi and the higher available silicon level,HASi)using P and Si competitive adsorption experiments and soil incubation experiments.[Result]When Si and P were simultaneously added at equimolar concentrations between pH 3.5 and 8.0,the presence of P decreased Si adsorption by 26%-74%and 31%-84%,respectively,in LASi and HASi soils at the corresponding pH,suggesting that P had a greater affinity to soil solids than did Si.Si sorption by the soil generally decreased with decreasing pH in the pH range of 3.5 to 8.0,and the reduction of Si sorption due to P addition was more significant under higher pH conditions.[Conclusion]Soil acidification and P addition decreased Si sorption and the soil HOAc-NaOAc-extractable Si content.The responses of soil CaCl2-extractable Si content to soil acidification and P addition were different between the two farmland soils,and further studies are needed to understand the mechanisms.关键词
硅移动性/磷富集/土壤酸化/硅吸附/硅有效性Key words
Silicon mobility/Phosphorus accumulation/Soil acidification/Silicon adsorption/Silicon availability分类
农业科技引用本文复制引用
张庚金,魏宗强,颜晓,吴建富..酸化与富磷对农田土壤硅有效性的影响[J].土壤学报,2024,61(3):813-823,11.基金项目
国家自然科学基金项目(41967014)和江西省自然科学基金项目(20212BAB205012)资助 Supported by the National Natural Science Foundation of China(No.41967014)and the Natural Science Foundation of Jiangxi Province,China(No.20212BAB205012) （41967014）
