Study On The Evolution Characteristics And Spatial Conflict Of Production-Living-Ecological Land In The Middle Reaches Of Heihe

With the intensification of the contradiction between the development of living and production space and the protection of ecological space,the problem of space conflict has received extensive attention to many scholars.Whether the area can achieve the coordination of socio-economic development and ecological protection in the development process has become the process of promoting the construction of ecological civilization.The key issue in.Due to the unique natural environmental conditions in arid areas,ecological protection is particularly important.Under the background of increasing interference intensity of human activities,ecological fragility is gradually increasing,and the contradiction between socio-economic development and ecological protection has become increasingly prominent.The middle reaches of the Heihe River are a key area to maintain ecological security in Northwest my country.In the context of continuous social and economic development,how to coordinate the conflicting relationship between production,living space development and ecological space protection,and rational use of limited water and land resources Become an important part of sustainable development in the middle reaches of the Heihe River.Based on the land use/cover data of the middle reaches of the Heihe River from1975 to 2016,this paper constructs a production-living-ecological land conflict evaluation model with the support of GIS spatial analysis technology,and comprehensively uses the transition matrix model,landscape pattern index,and geographic detector,Ordinary least squares regression and geographically weighted regression and other methods explored the distribution characteristics,evolution laws and change mechanisms of the production-living-ecological land space conflicts in the middle reaches of the Heihe River.The research results and main conclusions of this article are as follows:(1)The area of production-living-ecological land in the middle reaches of the Heihe River changed significantly from 1975 to 2016.In general,the area proportion of ecological production land and ecological land showed a downward trend,while the area proportion of production and ecological land and living and production land showed an upward trend.The land for ecological production decreased from 22.55% in1975 to 17.13% in 2016,the land for ecological production increased from 14.13% to21.54%,the land for living and production increased from 1.50% to 2.67%,and the land for ecological production decreased from 61.82% to 58.67%.The expansion of agricultural land to marginal areas leads to the decrease of ecological land and ecological production land.(2)The transformation of production-living-ecological land leads to the change of landscape pattern.In general,the landscape pattern of production-living-ecological land in the middle reaches of the Heihe River presents a trend of fragmentation,and the change characteristics of landscape pattern of different land types are different.The regions with higher fragmentation degree are mainly located in densely populated Linze County and Ganzhou District,and the change range of landscape pattern index is the most significant from 2010 to 2016.(3)The spatial distribution of spatial conflicts has a significant agglomeration feature,and the agriculture-pastoral ecotone and the land-water transition zone have a strong spatial conflict level,among which the conflict between ecological production land and ecological land is the most significant.The spatial conflict level of productionliving-ecological land in the middle reaches of the Heihe River showed a downward trend.The variation characteristics of spatial conflict in different periods are different.The level of spatial conflict is on the rise from 1975 to 1992,and after a significant decline from 1992 to 2001,it begins to rise gradually again.(4)The distribution of spatial conflict is affected by many factors,and the contribution of each factor is different in different regions.In general,socioeconomic factors are the main factors leading to spatial conflict distribution in Ganzhou District,and the spatial conflict distribution in Linze County and Gaotai County is more affected by natural environment factors than by socio-economic factors.The spatial conflict of production-living-ecological land in the middle reaches of the Heihe River is characterized by significant spatial differentiation,and the change of production-livingecological land in different locations has different impacts on the spatial conflict.In general,the marginal expansion of living and production land,ecological production land and ecological land will lead to a decrease in the level of spatial conflict,while the enclave increase will lead to an increase in the index of spatial conflict.