施用有机物料对覆膜滴灌土壤团聚体及有机碳分布的影响OA北大核心CSTPCD

Taking soil in the area of long-term drip irrigation with film mulching in Tumuji Town,Zh-alaite Banner,Inner Mongolia,as the research object,to explore the effects of different organic mate-rials(straw,pasture,and sheep dung)returning to the field on the characteristics of soil organic car-bon and soil aggregates,and analyze and compare the differences of different organic materials re-turning to the field.The results showed that,compared with the control group,organic materials re-turned to the field increased soil grain-level carbon content by 1.01 to 2.67 times;among the three materials,the effect of sheep manure is better,1.06 times and 1.12 times higher than other materials on average,indicating that the return of sheep manure to the field has a stronger potential for soil car-bon sequestration and can more promote the storage of soil organic carbon.At the same time,returning organic materials to the field promoted the increase in the proportion of large-diameter(>0.25 mm)soil particles in the soil.R>0.25,MWD,GMD was gradually increased,PAD,fractal dimen-sion(D)and soil erodibility K value gradually decreased.It shows that returning organic materials to the field can significantly enhance the stability of soil aggregates,among which straw is more condu-cive to enhancing mechanical stability,and sheep manure is more conducive to enhancing water sta-bility.In summary,returning organic materials to the field promotes the organic carbon content of semi-arid mulched drip irrigation soils,while enhancing soil aggregate stability.