黔桂岩溶山区土地利用冲突强度演变及其空间分异特征

Evolution and spatial variation of land use conflict intensity in Qian-Gui karst mountainous areas

采用基于"压力-状态-响应(Press-State-Response,PSR)的土地利用冲突强度模型,评估了1990-2010年黔桂岩溶山区土地利用冲突强度演变过程,并运用探索性空间分析方法(Exploratory Spatial Data Analysis,ESDA)对黔桂岩溶山区县域土地利用冲突强度变化的空间分异特征进行探讨,结果表明:(1)1990-2010年间黔桂岩溶山区土地利用冲突呈增强趋势,综合指数从0.09增长到0.30;(2)从全局空间自相关看,该区1990-2010年土地利用冲突强度存在显著空间集聚特征,且集聚态势进一步增强,时段Ⅲ压力指数、响应指数和综合指数变化量的Global Moran’s I指数为0.317 9、0.473 3和0.185 9,时段Ⅱ的Global Moran’s I值均大于时段Ⅰ的值;(3)就局域空间自相关而言,热点区、次热区趋向集聚于以贵阳市为龙头的黔中城市群、黔西南州、南宁市及其周边区域,冷点区、次冷区连片分布于黔桂峰丛洼地及其周边偏远山区。因而,建议在黔桂岩溶山区城镇化、工业化加速阶段,应优化土地利用结构,缓解土地利用冲突,以提高土地资源可持续利用水平。

In this paper,we both use land conflict model based on PSR（Press-State-Response）to assess the evolution of land use conflict intensity and explore the change of spatial differences of land use conflict intensity at a county level and use ESDA（Exploratory Spatial Data Analysis）method for the years from 1990to2010 in Qian-Gui karst mountainous areas.As the results,（1）From 1990 to 2010,the phenomenon of land use conflict had increased in Qian-Gui karst mountainous areas because LUCI（Land Use Conflict Index）rose from 0.09 to 0.30;（2）In the study region,the global spatial autocorrelation of land use conflict had a significant agglomeration characteristic which appeared an enhanced trend.In addition,the global Moran＇s I of the Press Index,the Response Index and LUCI were respectively 0.3179,0.4733 and 0.1859 in phase III.Particularly,the global Moran＇s I in phase II was greater than that of phase I;（3）In terms of local spatial autocorrelation,it is noted that the hotspots and sub-hotspots tended to agglomerate into city clusters which is located in Guiyang,Central Guizhou Province and Nanning City,Guangxi Zhuang Autonomous Region and its surrounding areas.However,cold spots and sub-cold spots collectively distributed in remote Qian-Gui karst peak-cluster depression areas and their surrounding districts.From the results,it is necessary to optimize the land use structure and alleviate the land use conflict,in order to improve the level of sustainable utilization of land resources.