资源枯竭城市国土空间生态保护重要性评价研究——以徐州市贾汪区为例

Research on Evaluation of the Importance of Land Spatial Ecological Protection of Resource-exhausted Cities:A Case of Jiawang District,Xuzhou City

选择水源涵养、固碳释氧、生物多样性保护3种生态系统服务功能,将生态系统服务重要性划分为极重要、高度重要、中度重要、轻度重要、不重要5个等级,综合评价徐州市贾汪区的生态功能重要性及其空间分布特征。结果表明,(1)水源涵养高度重要以上区域面积比为17.28%,主要分布在中部和北部山地,呈现出以大洞山为中心向周围递减的趋势。(2)固碳释氧高度重要以上区域面积比为21.46%,主要分布在中部大洞山、北部奶奶山和大鹿山区域,以及潘安湖地区。(3)生物多样性保护轻度重要区占比较高,面积比为48.03%;极重要区主要在中部和北部连片分布;高度重要区沿河道呈带状分布。(4)生态系统服务极重要和高度重要以上区域面积占研究区总面积的34.32%,主要分布在北部低山丘陵区、大洞山自然保护区和潘安湖湿地,其次是南部京杭运河和不牢河沿线。本研究结果可为徐州市贾汪区制定生态保护与修复策略提供科学依据,也为资源枯竭城市生态文明建设提供借鉴。

Select three ecosystem service functions:water conservation,carbon sequestration and oxygen release and biodiversity protection,and divide the importance of ecosystem service into five levels:extremely important,highly important,moderately important,slightly important and unimportant.Comprehensively evaluate the importance of ecological function and its spatial distribution characteristics in Jiawang District of Xuzhou City.The results show that,(1)the area ratio of areas above the high importance of water conservation is 17.28%,which is mainly distributed in the central and northern mountains,showing a decreasing trend from Dadong mountain to the surrounding.(2)The area ratio of areas above the high importance of carbon sequestration and oxygen release is 21.46%,which is mainly distributed in Dadong mountain in the middle,Granny mountain and Dalu mountain in the north,as well as Pan’an Lake area.(3)The proportion of lightly important areas for biodiversity protection is relatively high,with an area ratio of 48.03%,the extremely important areas are mainly distributed in the middle and North,highly important areas are distributed in strips along the river.(4)Ecosystem services are extremely important and highly important,accounting for 34.32%of the total area of the study area.They are mainly distributed in the northern low mountain and hilly area,Dadongshan nature reserve and Pan’an Lake wetland,followed by the Beijing Hangzhou canal and Bulao River in the south.The results of this study can provide a scientific basis for formulating ecological protection and restoration strategies in Jiawang District of Xuzhou,and also provide a reference for the construction of ecological civilization in resource exhausted cities.