Research On Green Space Empowerment Of Shi-ma-sha Urban Agglomeration Based On Carbon Sink

Purpose:As an important part of the Urban ecosystem,green space has played an important role in reducing urban carbon dioxide content and alleviating the Urban heat island effect,and is considered to be an important natural way to promote the city to achieve"double carbon".However,there are still problems in the current construction of urban green spaces,such as disorderly development,high fragmentation of green spaces,and low efficiency.In the context of“carbon peak and carbon neutrality”,how to improve the quality of current green spaces and enhance their ecological benefits is an urgent problem that needs to be solved.Method:This article is based on the interpretation of green spatial information in the Shi-ma-sha urban cluster and analyzes its spatiotemporal changes.Combined with the meteorological observation data and socio-economic development data of Manas,Shawan and Shihezi,the CASA model was used to estimate the green space net primary productivity（NPP）and net ecosystem productivity（NEP）of this area,and analyze the temporal and spatial distribution characteristics and changes of carbon sources/sinks of Shi-ma-sha town group.Using correlation analysis to explore the impact of factors such as temperature,precipitation,elevation,and different landscape pattern index on the carbon sink of green space in the Shi-ma-sha urban cluster.Based on the above analysis,this paper explores empowering measures to improve the ecological benefits of green space in the Shi-ma-sha urban cluster from two aspects:optimizing the layout of green space carbon sink network and increasing sink measures.Main results:（1）The green space of Shi-ma-sha Town Group was widely distributed in a large area south of Gurbantünggüt Desert.During the research period,the green space area of the Shi-ma-sha Town Cluster increased from 1521864 hm² in 2000 to 1603653 hm₂ in 2020,significantly increasing its proportion from68.98%in 2002 to 72.68%in 2020.The area of various green spaces was characterized by grassland>cultivated land>water>forest land.The main source of green space area transformation was the transformation of unused land to cultivated land and grassland.During the research period,the expansion direction of green space in the Shi-ma-sha urban cluster was mainly in the west and northwest directions.From the changes in landscape pattern index,it proves that the expansion of urban space in the Shi-ma-sha urban cluster had led to drastic changes in urban land use types,increasingly balanced landscape distribution,and improved landscape fragmentation.（2）The Shi-ma-sha urban cluster had significant vertical differentiation and strong spatial heterogeneity,with a prominent feature of high central and low north-south.High value areas were mainly urban oases and southern mountains,while low value areas were mainly located in high altitude mountains and Gurbantünggüt Desert.From 2002 to 2020,the annual average of NEP in the Shi-ma-sha Town Group showed a fluctuating upward trend,with an overall increase rate of 3.2673 g C·m-2·a-1.Between 2002and 2020,the areas with rapid carbon sequestration growth in the green space of the Shi-ma-sha Town Group were mainly located in the large area of farmland west of Xiaoguai and Sandaohezi Town,which showed a high degree of consistency with the expansion of urban green space.The carbon sequestration capacity of various green spaces is in the order of forest land>cultivated land>grassland>construction land>unused land>water area.（3）Carbon sink was negatively correlated with temperature and positively correlated with precipitation.When the altitude was above 1000m,NEP showed a trend of increasing first and then decreasing with the altitude.Different green spatial landscape patterns had different response mechanisms to carbon sinks,requiring refined management to improve regional carbon sink values.（4）Based on the MCR resistance model,a green spatial ecological network with three horizontal and two vertical directions and network coverage was constructed to explore methods for optimizing the regional green spatial pattern.A comprehensive approach was proposed to empower the green space of the Shi-ma-sha urban cluster from two aspects:optimizing the ecological network pattern of green space and measures to increase sinks.Main conclusion:From 2002 to 2020,the green space of the Shi-ma-sha urban cluster continued to expand,mainly due to the significant transformation of unused land into green space.During this process,the heterogeneity of the landscape in the Shi-ma-sha urban cluster has decreased,the degree of fragmentation has decreased,the regional carbon sequestration capacity has continued to increase,and the ecological environment has gradually improved.Among various factors,precipitation is an important factor affecting the carbon sequestration of the Shi-ma-sha urban cluster,and there are significant differences in green space carbon sequestration at different altitudes.Based on this,a green space carbon sequestration network system for the Shi-ma-sha urban cluster is constructed,and optimization plans are proposed.Specific measures to improve regional carbon sequestration are also proposed for different regions,empowering the realization of green space ecological benefits in the Shi-ma-sha urban cluster.