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Ningxia University (2020)

Impacts of Climate Change and Shrubification on Carbon Cycle in Desert Steppe

王乐;

Titre : Impacts of Climate Change and Shrubification on Carbon Cycle in Desert Steppe

Auteur : 王乐;

Grade : Master’s Theses 2020

Université : Ningxia University

Résumé partiel
The changes of climate and land-use will affect the material and energy cycle processes of terrestrial ecosystems.Global greening caused by human activities has been focused by scientists worldwidely.Large-scale afforestation conduced by ecological management projects in China is one of its driving factors.Under the given background,the feedback mechanism of carbon-water cycle in terrestrial ecosystems still need more study.Vegetation structure and function has changed a lot in ecological restoration projects while experiencing the global climate change,which inevitably caused profound impacts on the carbon cycle of the zonal desert steppe ecosystem that affected by artificial shrubification.Studying the impacts of climate change and artificial Caragana intermedia shrubification on carbon storage and exchange in desert steppe can not only reveal the carbon-water cycle response mechanism of terrestrial ecosystems under this background,but also can provide regional scientific basis for ecological management.Thus,this research used simulation and observation methods such as ecosystem process model and eddy covariance technique to explore the changes of carbon storage and exchange of desert steppe ecosystem in Yanchi County under the background of climate change and artificial shrubification in a long-term sequence.The main results of this study are as follows :(1)Based on the meteorological data from 1958 to 2017,climate scenarios simulation and Biome-BGC ecosystem process model,this study simulated the carbon storage of desert steppe in four different climate change scenarios.In these climate scenarios,the annual average total carbon storage of the desert steppe ecosystem in Yanchi County is 2.3208-2.3652 kg/m2.Soil carbon storage accounts for the highest proportion of total carbon storage,followed by litter carbon storage and vegetation carbon storage.The interannual fluctuation of vegetation carbon storage is more significant,which is also consistent with the fluctuation of precipitation in the same period,and total carbon storage shows a rising trend in fluctuation.T

Mots clés : Carbon cycle; Desert steppe; Biome-BGC; Climate change; Artificial shrubification;

Présentation (CNKI)

Page publiée le 27 mars 2022