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Chinese Academy of Agricultural Sciences (2021)

The Impact of Extreme Drought on Ecosystem Services and Values of Temperate Grassland in Inner Mongolia

王杰

Titre : The Impact of Extreme Drought on Ecosystem Services and Values of Temperate Grassland in Inner Mongolia

Auteur : 王杰

Grade : Master 2021

Université : Chinese Academy of Agricultural Sciences

Résumé partiel
As global changes are intensifying,the increase in extreme climate events has increasingly profoundly affected the ecosystems on which we depend.Ecosystem services are the benefits that mankind obtains from ecosystems and are the basis for mankind’s survival.Research on the effects of extreme drought on grassland ecosystems mostly focuses on ecosystem functions and processes such as ecosystem productivity,diversity,and biogeochemical cycles,while the impact of extreme drought on grassland ecosystem services and values has not been reported.Therefore,it is very important to study the impact of extreme drought on the temporal and spatial changes of grassland ecosystem service functions and values.This thesis takes the temperate grassland of Inner Mongolia as the research object,constructs an evaluation index system suitable for the ecosystem service function of the temperate grassland of Inner Mongolia,uses remote sensing images to estimate the ecosystem service function,and quantitatively analyzes the ecosystem bases on the estimated ecosystem service function value,to study the temporal and spatial change characteristics of the service function and value of the temperate grassland ecosystem in Inner Mongolia.Through six extreme drought networking experiments covering the main grassland types in Inner Mongolia,the response ratio of each indicator after extreme drought was determined,and the impact of extreme drought on ecosystem service functions and value was studied.This paper can quantify the impact of extreme drought on the ecosystem services and functions of the temperate grassland in Inner Mongolia,and recognize the hazards of extreme drought events,which has important guiding significance for the management and protection of grassland ecosystems.The main conclusions are as follows :(1)Evaluate the output of grass products,the amount of carbon fixation and oxygen release,the amount of water and soil conservation,and the amount of water conserved in the temperate grasslands of Inner Mongolia from 2015 to 2018.The four-year average value of grass product output was 1171kg/ha ;the carbon fixation and oxygen release were 172 g/m2and 466 g/m2respectively ;the water and soil conservation capacity is 30 t/ha ;the water conservation capacity was 103 t/ha ;Ecosystem service functions gradually decreased from northeast to southwest in spatial distribution.Divided according to the type of grassland,the ecosystem service function of meadow grassland was significantly higher than that of typical grassland and desert grassland.

Mots clés : Extreme drought ;Temperate grassland in Inner Mongolia ;Ecosystem services ;Value;Grassland type ;

Présentation (CNKI)

Page publiée le 11 novembre 2021