A Study On Evaluation Of Land Ecological Service Value In Northwest Ecological Fragile Areas Based On Meta Analysis

The ecological value is an important component of the natural value of land,which greatly affects the living environment and ecological protection.Combining with the actual needs of regional natural environment and social development to promote the rational use of land,as well as the development and protection of land function,is an extremely important one-dimensional construction of ecological civilization in China.China's northwest region has a vast territory,but covers a number of ecological crisis areas,the ecological environment is relatively fragile,is called the northwest ecological fragile area.From the zoning point of view,the five provinces of the northwest cover more than 95% of the land area of the northwest eco-fragile areas.The rational analysis of the ecological value characteristics of the five northwest provinces is beneficial to the sustainable development of agriculture and animal husbandry and the maintenance of ecosystem utility in the fragile ecological areas of northwest China.Meta-Regression analysis is to apply the natural resource value evaluation results of the research site to the resource value evaluation of the policy site.It can eliminate the heterogeneity of evaluation conclusions due to different research methods,and has the characteristics of objective,quantitative,comprehensive and repeatable.Limited by technology,capital,time and other factors,the cost of information collection in the early stage of empirical research on a large spatial scale is often very high,and the use of Meta analysis method to re-integrate analysis on the basis of existing research is also a useful exploration for low-cost evaluation of the value of natural resources.In view of this,this study takes the five provinces of northwest as an example to investigate the evolution characteristics of ecosystem service value in the fragile area of northwest ecology.To construct the Meta-regressive model of land ecosystem service value in five northwest provinces,combined with land use remote sensing monitoring data,to explore the trend and influencing factors of ecosystem service value change in five northwest provinces from 1990 to 2018.In order to provide a useful reference for the establishment of land use planning and ecological compensation standard in the ecological fragile area of Northwest China.The main conclusions of the study are as follows:(1)Constrained by geographical environment,the spatial distribution of all kinds of land in the five provinces of Northwest China is not balanced.The most important land distribution types of grassland and unused land in the region have low land urbanization level and great potential for development.From 1990 to 2018,the land use structure gradually became reasonable;(2)There are differences in the service value of different land ecosystems and their influencing factors.The relevant research on land ecological value assessment should fully consider the natural characteristics of the ecosystem and the level of social development;(3)In 1990-2018,the level of ecological-economic coordination in the five northwest provinces was in a state of micro-coordination for a long time.In 2018,Shaanxi,Gansu,Qinghai,Ningxia all showed mild coordination type,Xinjiang showed micro degree disharmony,and the land benefit management in Xinjiang region needed to be strengthened urgently;(4)After testing,the Meta regression model is effective and can be used to calculate the value of ecosystem services in the five northwest provinces.Calculated unit area ESV can provide reference for the northwest ecological fragile area to formulate ecological compensation standards.Based on the research conclusion,the paper further discusses the land use,ecological protection and future research directions of the ecologically fragile area in northwest China.Northwest of ecologically fragile area of land use and development should be on the premise of not damage the ecological environment sustainability,emphasis on regional land resources protection,restoration and improvement,through the research and development and promotion of suitable for northwest area and related industry science and technology,northwest of mining ecological fragile areas of land resources of new function and new value,actively promote the development and utilization of land intensification and diversification.