Download The Response of Different Vegetation Types to Climate Change in

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;
4
College 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