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Inner Mongolia University (2021)

Effects of Different Grazing Intensities on Soil Aggregate Stability in Typical Steppe

杨泽宇

Titre : Effects of Different Grazing Intensities on Soil Aggregate Stability in Typical Steppe

Auteur : 杨泽宇

Grade : Master 2021

Université : Inner Mongolia University

Résumé partiel
Grassland soil protection and degraded soil remediation are important research fields of environmental engineering in arid and semi-arid regions,and also one of the important contents of ecological safety barrier construction in northern China.Soil aggregates are important indicators to characterize soil structure and stability,which have attracted extensive attention in ecology,agricultural science and environmental science in recent years.Soil aggregates and their stability are important driving factors affecting soil fertility and soil carbon storage,and they are extremely sensitive to land use intensity.At present,the studies on the effects of grazing on grassland soil aggregates mostly focus on the relationship between soil physical and chemical properties and aggregates,and there are few studies on the effects of grazing disturbance on soil aggregates and their stability.In this study,the typical steppe in Xilingol League of Inner Mongolia was taken as an example,and four grazing intensives were set up on the grazing experimental platform : control(0 sheep/day·hm2),light grazing(2 sheep/day ·hm2),moderate grazing(4 sheep/day ·hm2)and heavy grazing(8 sheep/day ·hm2).The underground biomass,soil physicochemical properties,soil microbial biomass and the grain size distribution of soil aggregates under different grazing intensities were measured,and the effects of underground biomass,soil physicochemical properties and soil microorganisms on the content and stability of soil aggregates under different grazing intensities were analyzed.The results of this study can provide basic data for the study of the mechanism and process of soil aggregate structure and stability change in grassland ecosystem,and also provide reference for grassland soil protection and remediation of degraded soil.The important findings and conclusions are as follows:1.In the 0-40 cm soil layer of typical steppe,the underground biomass,soil total carbon,total nitrogen,organic carbon and microbial biomass nitrogen decreased significantly with the increase of grazing intensity and soil depth,but the soil bulk density and microbial biomass carbon contents increased significantly

Mots clés : Mechanical stability of agglomerates ;Water stability of agglomerates ;Soil physical and chemical properties ;Microbial biomass ;Grazing intensity ;

Présentation (CNKI)

Page publiée le 29 octobre 2021