生态与农村环境学报2025，Vol.41Issue(6)：792-801,10.DOI:10.19741/j.issn.1673-4831.2024.0533
沱江流域农地利用方式和土壤类型对耕层土壤有机碳组分的影响
Effects of Agricultural Land Use and Soil Type on Soil Organic Carbon Content in Topsoil in Tuojiang River Ba-sin
摘要
Abstract
Agricultural land use type and soil type are important factors affecting the content and stability of organic carbon in soil,understanding the effects of agricultural land use type and soil type on the spatial distribution of organic car-bon and its fractions is a prerequisite for developing reasonable tillage management measures and improving soil carbon se-questration potential and soil quality in cultivated land.Based on the data of 164 topsoil(0-20 cm)sampling points col-lected on cropland in the Tuojiang River Basin,this study investigated the effects of agricultural land use type and soil type on the contents of total organic carbon(SOC),easily oxidized organic carbon(EOC)and refractory organic carbon(ROC)in cultivated soil using geostatistical method and variance analysis.The results show that ROC was the main SOC fraction in the cropland topsoil in the Tuojiang River Basin,which accounted for 80.93%of SOC.The average contents of EOC and ROC were 2.71 and 11.46 g·kg-1,respectively,and the coefficient of variation ranged from 42.58%to 45.02%,representing a moderate degree of variation.Spatially,soil SOC,EOC and ROC contents were higher in the north,and lower in the south,and lower in the middle and high in the surrounding,which were jointly affected by struc-tural and random factors.The results of variance analysis show that agricultural land use was an important factor affecting the content of soil organic carbon and its fractions.SOC,EOC and ROC contents were the highest in dryland-paddy rota-tion land,followed by paddy field,and the lowest in dryland.Soil type had a significant effects on the content of organic carbon and its fractions,with paddy soil showing the highest content,followed by yellow soil,and purple soil.The refrac-tory organic carbon index(ROCI)of cropland soils in the Tuojiang River Basin is around 80%,suggesting a high stability of soil organic carbon in this basin.Among the three agricultural land use type the stability of soil organic carbon pool in paddy field was the highest,while paddy soil had the highest carbon pool stability among the three soil types.关键词
土壤易氧化有机碳/土壤惰性有机碳/农地利用方式/土壤类型/碳库稳定性Key words
easily oxidized organic carbon(EOC)/refractory organic carbon(ROC)/agricultural land use type/soil type/carbon pool stability分类
农业科学引用本文复制引用
李文丹,李艾雯,成金礼,陈丹,毛雅若,陈鑫怡,张元媛,李启权..沱江流域农地利用方式和土壤类型对耕层土壤有机碳组分的影响[J].生态与农村环境学报,2025,41(6):792-801,10.基金项目
四川省自然科学基金(2022NSFSC0104) （2022NSFSC0104）
