THE RESPONSE OF DIFFERENT VEGETATION TYPES TO CLIMATE CHANGE

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The Response of Different Vegetation Types to Climate Change in Hulun Buir,Inner Mongolia, China


Mengjiao LI1,2,Zhenghai LI1*,Yajing BAO1,Jing Zhang1, Zhichao Hu 1,2,Jie Qin1, 3, Menggenqiqige1,4

(1College of Environment and Resources of Dalian Minzu University, Dalian, Liaoning 116600, CHINA; 2College of Environment and Resources of Inner Mongolia University, Hohhot, Inner Mongolia, 010021,CHINA; 3 College of ecological and Environmental Sciences, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia, 010019,CHINA; 4College of Life Sciences of Inner Mongolia University, Hohhot, Inner Mongolia, 010021,CHINA; *[email protected])


As an important index to study the ecological environment of grassland and the carbon sequestration ability of grassland vegetation, vegetation cover condition is directly affected by climatic change. With the Hulun Buir Grassland and the forest-steppe ecotone as the research area, based on the ground measured biomass and NOAA and MODIS NDVI data from 1981-2012, the study establishes a productivity assessment model per the sample data and their corresponding NDVI values on MODIS image. Combining climatic data of corresponding years, the study uses coefficient of variation to analyze changes of climate and biomass of different types of vegetation on the Hulun Buir Grassland, explores the response degrees of different types of vegetation to climatic change, and analyzes differences between various vegetation areas in ecosystem stability and carbon sequestration function. As indicated by the research results, fluctuation in precipitation has a relatively small influence on the yield of grass in meadow steppe areas in forest wetland and forest-steppe ecotone. Temperature is the limiting factor of this area. The amount of precipitation has a comparative large impact on the yield of grass of Stipa grandis and Cleistogenes chinensis grassland and S. krylovii and C. chinensis steppe. The biomass variation coefficient value of grassland is relatively high and the biomass variation trend is basically identical with the precipitation change trend. Compared with forest land, grassland is more sensitive to climatic change. With a relatively fragile ecological system, grassland is greatly affected by the climate. In the early 21st century characterized by fierce climatic fluctuation, variable coefficients of forest wetland and forest-steppe ecotone have not increased significantly and their ecosystem remains constantly stable. Due to abundant groundwater resources and the implementation of natural forest resources protection projects, those regions possess relatively strong carbon sequestration abilities and become carbon sinks.

Key words: Vegetation types; Climate change; Biomass; Coefficient of variation; Carbon fixation; Hulun Buir



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