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[Ecological Effects and Influencing Factors of the Spatial Pattern Evolution of "Three Zones Space" in the
Xue Wang1, Hong Shuai1, Yao-Yao Chen1
1School of Geographical Science, Hunan Normal University, Changsha 410006, China.
Abstract:
The Chang-Zhu-Tan urban agglomeration is a core growth pole for high-quality development in central China. Clarifying the relationship between the spatial evolution of the "three zones" (urban, agricultural, and ecological spaces) and ecological service functions, as well as their driving factors, is of great significance for optimizing regional territorial space and ecological protection. This study analyzed the spatiotemporal characteristics of six types of ecological services in the Chang-Zhu-Tan urban agglomeration from 2000 to 2020 using land use transfer matrices and the InVEST model, calculated the comprehensive ecological service index and the ecological contribution rate of spatial transformation in the "three zones space", and explored the driving mechanisms using the random forest model. The results showed that: ① Over the 20 years, urban space in the Chang-Zhu-Tan urban agglomeration continued to expand, while agricultural and ecological spaces shrank. The total cross-conversion area of the three types of spaces reached 2 504.29 km2, mainly characterized by mutual conversion between agricultural and ecological spaces, followed by conversion to urban space, and the least conversion from urban space to agricultural and ecological spaces. ② The overall ecosystem service functions deteriorated, with the comprehensive ecosystem service index decreasing by 0.011. Four functions, including habitat quality, food supply, carbon sequestration, and recreational services, declined, while soil conservation and water purification functions improved. The conversion of agricultural and ecological spaces to urban space was the main cause. ③ Ecosystem service functions were jointly affected by natural geography, social economy, and transportation location. Factors such as night-time light index and topographic relief played a leading role, and there was a non-linear correlation between variables. This study can provide a decision-making basis for land resource utilization and ecological protection in the Chang-Zhu-Tan urban agglomeration.
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