| The Yangtze River Economic Belt is based on the basin which linked by Yangtze River.The macro-collaborative economic belt based on the Yangtze River Delta urban agglomeration,the middle reaches of the Yangtze River and the Chengdu-Chongqing urban agglomeration has an important strategic position.It spans the three major steps of China’s geography,and there are great differences in development conditions such as resources,environment,transportation,and industrial foundation.The contradiction between regional development and protection is prominent,and the environmental pollution situation is severe.As the most obvious manifestation of global environmental change,land use change indirectly affects the cyclical and ecological processes of surface materials such as climate change,biodiversity,biochemical cycles and sustainable use of resources,and it caused the changes in ecosystem functions and structures.This will play a decisive role in the maintenance of ecosystems and their service functions.Therefore,scientificaly clarifying the ecological response caused by land use change in the process of urbanization is an important prerequisite for the coordinated development of ecology and economy.Using land utilization data of the Yangtze River Economic Belt in the four periods of 1990,2000,2010 and 2015,and adopting land use transfer probability matrix,dynamic degree model,standard deviation eliptical and habitat quality model methods,analyzing the land use of the Yangtze River Economic Belt Temporal and spatial dynamic distribution patterns and their habitat quality status objectively.Then,with the help of modified XIE Gao-di revising Costanza method,geo-detector and sensitivity index,the value of ecosystem service in the study area was calculated,and three aspects of the ecological value of different ecosystem types,individual ecological functions and unit area were analysis profoundly,calculation of all counties in the Yangtze River Economic Belt,so that the research is accurate to the county level.Meanwhile,the spatial distribution pattern and its influencing factors were explored,which reveals the basic characteristics and evolution of the ecosystem service value of the Yangtze River Economic Belt.After sensitivity analysis,the value of ecosystem services in the Yangtze River Economic Belt was inelastic to the value coefficient,and the research results are credible.The results showed:(1)The land use type of the Yangtze River Economic Belt was mainly woodland,accounting for 46% of the whole area,followed by cultivated land,grassland,water area,construction land and unutilized land.(2)From 1990 to 2015,the area of cultivated land continued to decrease,and the area of forest land showed a trend of decreasing first then increasing and then decreasing repeatedly.The grassland showed a trend of increasing first and then decreasing,and the area of water area and construction land continued to increase.(3)The focus of new construction land in three periods was basically moving in the border areas of Anhui and Hubei Province.The standard deviation elipse azimuth was between 62.702°-79.126°,and the newly added construction land was presented as “the distribution pattern of the southwest-northeast direction.(4)The habitat quality of the Yangtze River Economic Belt generaly showed a trend higher in the west than in the east,and the degree of habitat degradation generaly showed a trend from the east to the middle to the west.(5)The total value of ecosystem services in the Yangtze River Economic Belt in 1990,2000,2010 and 2015 was 37,723.69 billion yuan,3,768 billion yuan,3,771,706 milion yuan and 376,316 milion yuan respectively,showed a decrease,then increase and then reduce repeated fluctuations.The situation of forest ecosystem value was the largest,which dominates the overall trend of the region.(6)There was a clear imbalance in the spatial distribution pattern of ecosystem service value.The ecosystem services of Dongting Lake,Poyang Lake,Hongze Lake,Taihu Lake and the surrounding areas were much higher than other regions,but the Chengdu-Chongqing urban agglomeration,the Wuhan city and its near area,the northern part of Anhui Province,and most of Jiangsu Province,there were low-value areas that were significantly lower than other areas.(7)The impact factors of ecosystem service value were significantly different.Among the various impact factors,soil type has the greatest impact on the distribution of ecosystem value.Soil erosion degree factor has no significant effect on the distribution of ecosystem service value,and has no obvious correlation.(8)To protect the ecological environment,maintain biodiversity,to optimize the distribution of ecological sources,ecological corridors and ecological nodes,to build an ecological security pattern of “upstream driving ecological,midstream support ecological,and downstream rise ecological” in Yangtze River Economic Belt... |
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