Response mechanism of ecosystem service value to urban and rural construction land expansion in the three outlets of the southern Jingjiang River
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摘要: 针对当前生态系统服务价值对城乡建设用地扩张响应机理研究的不足,本研究以荆南三口地区为研究对象,采用当量因子法计算荆南三口地区生态系统服务价值,对生态系统服务价值的时空变化特征进行分析; 通过线性回归方法,分析生态系统服务价值对城乡建设用地扩张的响应机理。研究结果表明: 1990—2018年间,荆南三口地区的ESV从443.56亿元增加至471.03亿元,ESV整体经历了平缓的增长过程; ESV的空间差异较为明显,中高值区面积减少较快,低值区面积增加较快; 城乡建设用地扩张较为显著,总扩张量为27.74 km2,经历了”缓慢-负增长-缓慢-快速-减速”的波动扩张过程; 城乡建设用地侵占不同地类,对各类生态系统服务的损益值有不同程度的影响,其中侵占高生态价值地类(水域、湿地)的比例越大,对生态的破坏性越高。荆南三口地区在未来的土地利用中,应转换传统的建设用地扩张模式,合理规划城镇用地边界,严守耕地红线,提高土地集约利用水平。同时完善河湖管理体制,加强河湖生态保护与修复,提升河湖生态服务功能。Abstract: In view of the shortcomings of the current research on the response mechanism of ecosystem services value to urban and rural construction land expansion, By taking the three outlets of southern Jingjiang River as the research object, this study calculates the ecosystem service value of the three outlets of southern Jingjiang River by equivalent factor method, analyzes the temporal and spatial variation characteristics of ecosystem service value, and analyzes the response mechanism of ecosystem service value to urban and rural construction land expansion by linear regression method. The results show that from 1990 to 2018, ESV in the three outlets of southern Jingjiang River increased from 44.356 billion yuan to 47.103 billion yuan, which experienced a gentle growth process as a whole. The spatial difference of ESV was obvious. Specifically, the area of the high- and medium-value areas decreased rapidly, and the area of the low-value areas increased rapidly. The expansion of construction land was more significant, with a total expansion of 27.74 km2, which experienced the fluctuating expansion process of "slow-negative-slow-rapid- decelerated expansion". Construction land occupied different types of land, which has different degrees of impact on the loss and gain values of all kinds of ecosystem services, and the greater the proportion of occupation high ecological value land (water area, wetland), the higher the damage to the ecology. In the future use of the land of the three outlets of southern Jingjiang River, the traditional expansion mode of construction land should be changed, the boundary of urban land use should be reasonably planned, the red line of arable land should be strictly observed, and the level of intensive land use should be improved. At the same time, we should improve the management system of rivers and lakes, make more efforts on the ecological protection and restoration of rivers and lakes, and improve the ecological service function for rivers and lakes.
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