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Inner Mongolia Agricultural University (2021)

The Effects of Grazing and Drought on Vegetation and Soil Characteristics and Greenhouse Gas Flux in the Desert Steppe

朱国栋

Titre : The Effects of Grazing and Drought on Vegetation and Soil Characteristics and Greenhouse Gas Flux in the Desert Steppe

Auteur : 朱国栋

Grade : Doctoral Dissertation 2021

Université : Inner Mongolia Agricultural University

Résumé partiel
Desert steppe is the aridest grassland ecosystem in the transition from steppe to the desert,which has a wide distribution and a large area,so it is highly sensitive to various disturbance activities.In recent years,this ecosystem faces serious threats due to the combined impact of global climate change and long-term unreasonable human utilization,especially the impacts of extreme drought and long-term overgrazing utilization.Under the background of climate change,the dynamic changes of this ecosystem will profoundly affect the livestock production,regional and global carbon balance and ecological service function.However,there is still a lack of comprehensive and systematic understanding of the response of different components of the desert grassland ecosystem to extreme drought and free-grazing disturbance and their regulatory mechanisms.Therefore,the grazing(free grazing:FG,control:CK)and the extreme drought test(reduce66%of precipitation from May to August:W1,reduce 100%of precipitation in June and July:W2,control:CK)platform was established in the Xilamuren desert steppe of Inner Mongolia in 2014 and 2016 respectively to study the effects of extreme drought and long-term free grazing on vegetation,soil physical and chemical properties and greenhouse gas flux deeply and the main driving factors of greenhouse flux comprehensively with the combined method of field sampling investigation and indoor measurement analysis.

Mots clés : Desert steppe ;Free grazing ;Extreme drought ;Vegetation characteristics ;Soil physical and chemical properties ;Greenhouse gas flux ;

Présentation (CNKI)

Page publiée le 15 février 2022