| Land use transition and its impact on ecosystem service value(ESV)are the foundation of optimizing the layout of territorial space and ecological civilization construction.With the acceleration of industrialization and urbanization,the area of construction land has expanded.So it has become a research hotspot to fully consider its impact on the ecological environment,accurately estimate the regional ESV and explore the ecological effects of land use.This paper took Gangcheng District of Jinan,a steel base in Shandong Province,as the study area.Based on remote sensing images,the land use data of four years in 1990,2000,2010 and 2021 were obtained,and the characteristics of land use transition from 1990 to 2021were explored by using geo-informatic Tupu,and put forward a method for calculating ESV in industrial counties-introducing the"three wastes"factor method.By introducing the value factors of waste gas,waste water and waste from construction land,the calculation system of ESV in industrial counties was improved,and the characteristics of ESV were explored in combination with the grid pattern.Finally,the contribution of land use transition to ESV was calculated and the effect of land use transition on ESV was measured.The results show that:(1)The characteristics of land use transition from 1990 to 2021 were proved.The land use types in Gangcheng District were mainly cultivated land and forestland.Over the past 30 years,the cultivated land area first increased and then decreased,with a net increase of 1468.41 hm~2,the forestland area first decreased and then increased,with a net increase of 1553.25 hm~2,the grassland area continued to decrease,with a decrease of about8718.88 hm~2,and the construction land area continued to increase radially from the county seat,with an increase of about 4750.87 hm~2.In 1990-2000 and 2000-2010,the total area of land use transition was 23689.27 hm~2and 25296.11 hm~2,respectively.Due to food demand and industrialization,the land use transition was mainly grassland and forestland transformed into cultivated land,and cultivated land and forestland transformed into construction land.The total area of land use transition in 2010-2021 was 16024.88 hm~2.Under the influence of ecological protection policy,the most important land use transition was the transformation from cultivated land to forestland.The types of land use transition were mainly repetitive and continuous,covering an area of 12718.68 hm~2and 15972.22 hm~2,respectively.The repetitive transition among the four land use types,namely cultivated land,forestland,grassland and construction land,was more complicated.(2)The characteristics of ESV from 1990 to 2021 were proved.Based on the method of introducing the"three wastes"factor,the ESV of Gangcheng District in 1990,2000,2010 and 2021 was 2.035 billion yuan,1.682 billion yuan,1.655billion yuan and 1.928 billion yuan,respectively.The ESV first decreased and then increased,with a slight overall decline for more than 30 years,showing a spatial distribution characteristic of"low in the south-central and high around".The ESV of Ecosystem service function mainly included hydrological regulation,climate regulation and soil conservation.In1990,the slightly high value of ESV ranked first,accounting for 38.18%,and the slightly low value of ESV accounted for the largest proportion in 2000,2010 and 2021,accounting for37.06%,38.92%and 33.76%respectively.The high value and slightly high value areas of ESV were mainly distributed in the northeast,southeast and southwest of the study area,and the slightly low value and low value areas were mainly construction land and cultivated land.In 1990-2010,affected by the increase in food demand and industrial development,forestland and grassland were transformed into cultivated land and construction land,which led to the decline of ESV;In 2010-2021,the study area coordinated the comprehensive management of landscape,forest,field,lake and grass,carried out ecological protection projects,and transformed a large area of cultivated land into forestland,thus increased ESV.(3)The effect of land use transition on ESV was proved.Based on the method of introducing the"three wastes"factor,the overall impact of land use transition on ESV in 1990-2000 and 2000-2021 was negative,with the total contribution rate of negative effects being 68.28%and 73.16%respectively,while the impact of land use transition on ESV in 2010-2021 was positive,with the total contribution rate of positive effects being 81.72%.In 1990-2010,due to the adjustment of agricultural structure and the development of the iron and steel industry,the transition from forestland and grassland to cultivated land and construction land dominated the negative effect of ESV,and the transition from cultivated land to forestland dominated the positive effect of ESV.In 2010-2021,the ecological protection policy was implemented,and the transition from cultivated land to forestland dominated the positive effect of ESV,while the transition from cultivated land to construction land dominated the negative effect of ESV.(4)The introduction of"three wastes"factor method can accurately calculate ESV and accurately reflect the impact of land use transition on ESV.Compared with the traditional method and Xie Gaodi’s method,the method of introducing"three wastes"factor can calculate the ESV of industrial counties more accurately in numerical value,and analyze the change process of ESV in detail in spatial-temporal analysis.When studying the impact of land use transition on ESV,this paper fully considered the impact of construction land area change and accurately calculated the contribution rate of positive and negative effects of land use transition to promote ESV change.To sum up,industrial counties should adhere to green development in the process of industrialization and urbanization in the future,strengthen ecological protection and land greening projects,complete the conversion of old and new kinetic energy,promote the construction of new industries,and achieve dual economic and ecological benefits.This paper can not only enrich the theories and technical methods of land use transition and its effects,and provide a case reference for similar industrial counties,but also provide data and decision-making support for the spatial layout and ecological protection.in the study area. |
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