土壤2025，Vol.57Issue(5)：1004-1012,9.DOI:10.13758/j.cnki.tr.2025.05.007
长期施肥对灌漠土有机碳含量及碳储量的影响
Effects of Long-term Fertilization on Organic Carbon Content and Carbon Storage in Irrigated Desert Soil
摘要
Abstract
To elucidate the spatiotemporal evolution of soil organic carbon(SOC)in irrigation desert soil under long-term fertilization,this study utilized a long-term field experiment established in 1982 in Zhangye,Gansu Province.The regulatory effects of eight fertilization treatments(CK:no fertilization;N:nitrogen;NP:nitrogen+phosphorus;NPK:nitrogen+phosphorus+potassium;M:manure;MN:manure+nitrogen;MNP:manure+nitrogen+phosphorus;MNPK:manure+nitrogen+phosphorus+potassium)on SOC content and storage across the 0-200 cm soil profiles under three cropping systems(wheat-wheat-maize rotation,wheat/maize intercropping,and maize monoculture)were systematically analyzed during two sampling periods(2003:after 22 years;2022:after 41 years).The results showed that:1)Fertilization regimes significantly influenced SOC accumulation efficiency,with SOC content ranked as MNP,MNPK>M,MN>N,CK>NP,NPK.SOC in CK and N declined continuously,while M markedly enhanced SOC,with MNPK showing the greatest increase.2)SOC exhibited distinct vertical stratification,with topsoil(0-20 cm)showing the highest SOC content and storage(2003:9.67-16.15 g/kg,28.7-45.5 t/hm2;2022:10.47-15.70 g/kg,29.5-44.3 t/hm2),decreasing exponentially with depth.3)Cropping systems modulated carbon use efficiency.Organic manure application achieved a carbon sequestration rate of 38.6%with 132.2 kg organic carbon consumed per ton of grain yield under wheat rotation,whereas the carbon sequestration rate decreased to 24.7%and the carbon consumption increased to 156.6 kg/t under maize intercropping/monoculture,highlighting the role of crop configuration in balancing carbon input and sequestration.In conclusion,organic-inorganic combined fertilization synergistically enhances topsoil carbon capacity and subsoil carbon stability,serving as a core strategy for optimizing carbon sequestration and grain productivity in arid irrigation-silted soils.In addition,it is recommended to implement a wheat maize rotation system in irrigated desert soil areas to enhance soil carbon sequestration function.These findings provide critical scientific insights for designing regional agricultural carbon neutrality pathways.关键词
长期施肥/灌漠土/有机碳/有机碳储量/土壤剖面Key words
Long term fertilization/Irrigated desert soil/Organic carbon/Organic carbon storage/Soil profile分类
农业科技引用本文复制引用
张建文,马煜卿,张盛,杜健,孙建好,吴海燕,孙宁科,索东让,赵小宁,许依,夏龙龙..长期施肥对灌漠土有机碳含量及碳储量的影响[J].土壤,2025,57(5):1004-1012,9.基金项目
张掖市市级科技计划项目(ZY2022KY04)和中央引导地方科技发展资金项目(24ZYQA053)资助. （ZY2022KY04）
