Research On Ecosystem Service Value Of Lanzhou New District Based On Land Use Change

As the basis for the existence and reproduction of all life,land is also the space carrier of the ecosystem.Its utilization changes have an important impact on the evolution of the natural ecosystem and the sustainable development of social economy.Based on the remote sensing image data of Lanzhou New District in 2010,2015,and2018,this paper first explored the spatio-temporal characteristics of land use change in Lanzhou New District from 2010 to 2018 using methods such as single land use dynamics,land use transfer matrix,and landscape pattern index.The transformation of land use and the change of landscape pattern of land use.Secondly,the equivalent factor method was used to calculate the ecosystem service value of Lanzhou New District from 2010 to 2018,and its temporal and spatial characteristics were analyzed.On this basis,the impact of land use change on the value of ecosystem services is analyzed.Draw the following main Conclusions:(1)From 2010 to 2018,the land use structure of Lanzhou New District is dominated by grassland and cultivated land,followed by construction land,woodland,water area and unused land.Land use changes show the characteristics of"three increases and three decreases".It shows that the area of construction land,woodland,and water area has increased,and the area of cultivated land,grassland,and unused land has decreased.From the perspective of land use dynamics,from 2010 to 2018,the dynamics of construction land was the largest,reching 27.00%;followed by woodland and water area,with 13.15%and 11.29%;cultivated land,unused land and grassland have the smallest dynamic degree,with-4.79%,-1.38%and-1.24%respectively.(2)The land use types with the largest transfer volume are grassland and cultivated land,with 170.230 km~2and 159.453 km~2transferred respectively,mainly converted to construction land and woodland;the largest transfer volume is construction land,with a total transfer of 209.899 km~2,it is mainly from the grassland and cultivated land.The overall performance is that the continuous expansion of construction land is constantly encroaching on cultivated land and grassland.From the perspective of the spatial distribution of various land use types,the central and northern parts of Lanzhou New District have changed the most.The construction land has expanded to the northeast and southeast,and concentrated in the vicinity of Zhongchuan Town and Xicha Town.(3)The degree of fragmentation of cultivated land and grassland in Lanzhou New District has increased,and the degree of cohesion and connectivity decreased;the degree of fragmentation of woodland and water area decreased,and the degree of cohesion and connectivity increased;the degree of fragmentation of construction land and unused land reduced,and the degree of cohesion and connectivity increased.(4)The overall ecosystem service value of Lanzhou New District has been decreasing year by year,from RMB 1,388,985,100 in 2010 to RMB 1,277,725,900 in2018.The main reason is that the area of cultivated land and grassland with a larger ecosystem service value equivalent of land use types in the study area has decreased,while the area of construction land with a smaller ecosystem service value equivalent has increased.(5)The higher value of ecosystem service functions are mainly climate regulation and hydrological regulation,and the maintenance of nutrient circulation and the supply of water area are of lower value.The spatial distribution of ecosystem service value corresponds to the spatial distribution of land use types,showing a distribution pattern of"low in the middle and high on both sides".The low-value areas and low-value areas of ecosystem services are mainly distributed in the central and northern regions,and the surrounding ecosystem service values are relatively high.(6)Construction land and grassland have the largest contribution rate to the variation of ecosystem service value.They are the two main types of land use that affect the value of ecosystem services in the study area,followed by cultivated land and woodland.Unused land has the least impact on the value of ecosystem services.The main factors affecting land use and ecosystem service value changes in Lanzhou New District are the policy factors.