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Xinjiang Agricultural University (新疆农业大学) 2021

Effect of Grazing Exclusion on Soil Organic Carbon and Soil Bacterial Diversity in Sagebrush Desert

崔雨萱

Titre : Effect of Grazing Exclusion on Soil Organic Carbon and Soil Bacterial Diversity in Sagebrush Desert

Auteur : 崔雨萱

Grade : Master 2021

Université : Xinjiang Agricultural University (新疆农业大学)

Résumé partiel
The soil organic carbon and soil bacterial diversity in sagebrush desert on northern slope of Tianshan Mountains were measured.Using correlation analysis,redundancy analysis(RDA)and structural equation model(SEM)method aimed to clarify the general law of soil organic carbon and bacterial diversity in the response of sagebrush desert grassland after grazing exclusion.We analyze the influencing factors of soil organic carbon and bacterial diversity,and explore the relationship among soil organic carbon and bacterial diversity.To provide a certain theoretical basis for understanding the restoration of degraded sagebrush desert grassland soil.The main results are as follows :(1)After grazing exclusion,the above-ground biomass of sagebrush desert grassland increased significantly by 65.99%~246.66%,and the below-ground biomass increased by65.56%~151.89%,and it was mainly concentrated in the 0-5 cm soil layer.The litter biomass accumulation effect is not significant(P>0.05).(2)After grazing exclusion,soil water content and total phosphorus content(33.45% and18.87%)showed significantly reduces in Xinyuan sagebrush desert grassland,while the electrical conductivity was significantly increased by 347.87%,But there was no significant change in other plots(P>0.05).There was no change in soil bulk density,p H,total nitrogen content,and microbial biomass carbon in all plots(P>0.05).After grazing exclusion,the microbial biomass nitrogen and microbial biomass phosphorus of the Qitai plot were significantly reduced by 31.80% and 42.05%,while the microbial biomass nitrogen of the Hutubi plot was significantly increased by 27.90%,and the microbial biomass P of the Bole plot was significantly increased by 43.02% ;The changes of microbial biomass N and P in other plots were not significant(P>0.05).

Mots clés : grazing exclusion ;sagebrush desert grassland ;soil organic carbon ;bacterial diversity ;northern slope of Tianshan Mountains ;SEM analysis ;

Présentation (CNKI)

Page publiée le 9 mars 2022