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Shandong Agricultural University (山东农业大学) 2021

Structure and Nutrient Characteristics of Aeolian Sand Flow in Desert Steppe under Different Grazing Intensities in Sunite Right Banner

闫影影

Titre : Structure and Nutrient Characteristics of Aeolian Sand Flow in Desert Steppe under Different Grazing Intensities in Sunite Right Banner

Auteur : 闫影影

Grade : Master 2021

Université : Shandong Agricultural University (山东农业大学)

Résumé partiel
Desert steppe is the most sensitive grassland type to external disturbance,and it is the most xerophytic grassland ecosystem.It bears more severe wind erosion and grazing stress than other grassland types.The research on the influence of different grazing intensity on the process of wind-blown sand transport in desert steppe can clarify the influence of grazing intensity on the process of wind erosion and nutrient distribution in desert steppe,and it is of great significance for scientific planning of grazing system and rational formulation of grassland protection policy.Based on this,the desert steppe in Sonid Right Banner of Inner Mongolia was taken as the research object,and sand collectors were set up in the continuous random block grazing plots(Light grazing LG,Moderate grazing MG,Heavy grazing HG,Extreme heavy grazing EG and no grazing CK).Through two-year sampling period monitoring,the transportation of different grazing intensities in growing season(May to October)and non-growing season(November-next April)were studied Based on the variation characteristics of sand rate with height,the effects of Different Grazing Intensities on the daily average sediment flux in growing season and non-growing season were explored ;the vertical distribution of grain size of aeolian sand flow under different grazing intensities was studied,and the changes of total carbon,total nitrogen content and C/N ratio of aeolian sand flow sediment under different grazing intensities were explored.

Mots clés : Grazing intensity ;Desert steppe ;Sediment transport rate ;Particle size distribution ;Nutrients in aeolian sediment ;

Présentation (CNKI)

Page publiée le 10 mars 2022