Study on the Effects of Grazing on Nutrients and Plants in Desert Grassland Ecosystems
Due to the unique geographical location and climatic environment of desert grasslands,the ecology of the region is relatively fragile and highly susceptible to human activities.This paper aims to introduce the effects of grazing on the physical properties(bulk density and water content),chemical properties(organic matter),indi-vidual and community characteristics of plants,and microbial diversity of desert grassland soil,based on the re-search of scholars.The results show that under normal circumstances,with the increase of grazing intensity,the soil structure will change,especially the surface soil.As the soil bulk density increases,the soil permeability de-creases.However,in sandy soils with relatively poor soil quality,overgrazing can lead to a decrease in soil bulk density.The impact of grazing on soil organic matter is influenced by multiple factors,and soils with lower organ-ic matter content are more sensitive to grazing.In terms of plants and microorganisms,most scholars have consist-ent experimental results with the"moderate disturbance"theory,indicating that appropriate grazing can not only promote the increase of soil nutrients,but also promote the development of individual plants and the increase of microbial diversity,thereby promoting the sustainable development of grassland ecosystems.However,overg-razing can lead to stunted plant individuals,degraded plant communities,and decreased microbial diversity.To carry out scientific and rational grazing in desert grassland areas,in addition to adopting unified research methods and means,multiple grazing methods and grazing objects should be used as supporting experiments,and grazing should be combined with environmental factors to promote harmonious coexistence between humans and nature.
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