Changes in gross ecosystem product and its response to land use changes in forest resource dominant regions:A case study of Zixi County,Jiangxi Province,China
Forests are one of the most important terrestrial ecosystems and play a crucial role in the construction of ecological civilization.Understanding the changes in gross ecosystem product(GEP)and its response to land use change in areas with unique advantages in forest resources is of great significance for promoting sustainable develop-ment.We examined the GEP of Zixi County of Jiangxi Province.Based on the theory and method of ecosystem value accounting,and on the basis of the general indicator system for regulating services(water source conservation,soil conservation,oxygen supply,carbon fixation,climate control,flood regulation,water purification,air cleaning,species conservation)and the general indicator system for cultural services(landscape recreation,education),we added negative oxygen ions and health care indicators and introduced forest ecosystem service correction coefficients to construct a GEP indicator system and method with unique advantages in forest resources.We evaluated the spatio-temporal variations of GEP in 2010,2017 and 2020,and quantified the impact of land use/land cover change on GEP by means of elasticity index and value profit and loss analysis.The results showed that the GEP of Zixi County in 2010,2017 and 2020 was 16.788 billion,26.817 billion,and 38.407 billion yuan,respectively.Forests contri-buted the largest amount of GEP,followed by wetland,farmland,grassland,and town.During the study period,the added value of GEP mainly came from forest ecosystems.Land use change had an important impact on GEP.From 2010 to 2020,the total land use change area in the study area was 8501.88 hm2.The amplitude of land use change was grassland(-2811.17 hm2)＞town(1428.06 hm2)＞forest(1357.67 hm2)＞wetland(1031.05 hm2)＞farmland(-1005.01 hm2).The absolute changes of various land use types were mainly occurred from 2017 to 2020.The elasticity index of each indicator on forest ecosystems was significantly higher than that of other ecosys-tems,indicating that GEP had the highest sensitivity to changes in forest area.The results of value profit and loss analysis showed that urban development had reduced GEP to some extent,while the protection of forest and wetland had increased GEP.From 2010 to 2020,the conversion of land use types in Zixi County led to an increase of 1.865 billion yuan in GEP,indicating that land use change in Zixi County had a positive ecological impact on the whole.Our results reflect the green development effect of Zixi County after becoming a national ecological civilization con-struction demonstration county,which could provide decision-making support for high-quality development,high-level protection and sustainable development and utilization of land resources in the future,and provide reference for other similar areas of GEP accounting.
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