摘要
[目的]揭示国土开发强度变化对生态安全时空格局演变的非线性影响,为推进武陵山区高质量发展和筑牢长江上游生态安全屏障提供科学依据。[方法]以国家重点生态功能区武陵山区为考察对象,构建国土开发强度和生态安全综合评估体系,采用空间杜宾模型解析了国土开发强度对生态安全的空间溢出效应,并利用门槛模型厘清多重约束条件下的非线性影响。[结果](1)武陵山区国土开发强度从2000年的0.195升至2020年的0.273,生态安全指数从2000年的0.282增至2020年的0.438,两者均呈波动上升发展态势。(2)国土开发强度与生态安全存在正向空间溢出效应,国土开发强度对本县区生态安全指数增长的溢出效应明显强于邻近县区溢出效应,整体驱动着武陵山区生态安全水平正向演化。(3)武陵山区国土开发强度提升对生态安全存在门槛效应,呈现“增强—减弱”的倒“U”型曲线关系,当门槛值介于[0.158,0.309],则国土空间开发对筑牢生态安全屏障具有显著的强化作用。[结论]研究期间武陵山区国土开发强度及其阈值逐渐增大,对生态安全的影响程度存在明显的时空异质性,因地制宜设置国土开发强度区间成为优化国土空间开发保护新格局的关键。
[Objective]The aim of this study is to reveal the spatial and temporal patterns of nonlinear impact of changes in territorial development intensity on the evolution of ecological security,provide a scientific basis for promoting the high-quality development of the Wuling Mountain Area,and to build a strong ecological security barrier in the upper reaches of the Yangtze River.[Methods]The Wuling Mountain Area,a national key ecological functional area,was taken as the research object,the comprehensive assessment system of territorial development intensity and ecological security was firstly constructed.Then the spatial Dubin model was used to analyze the spatial spillover effect of territorial development intensity on ecological security.The threshold model was used to clarify the nonlinear relationship between the two under multiple constraints.[Results]The mean value of territorial development intensity increased from 0.195 in 2000 to 0.273 in 2020,and the mean value of ecological security index increased from 0.282 in 2000 to 0.438 in 2020,both of which showed an increasing trend of fluctuation.There was a positive spatial spillover effect between territorial development intensity and ecological security.The spillover effect of territorial development intensity on the exponential growth of ecological security in this county was significantly stronger than that in neighboring counties,overall driving the positive evolution of ecological security level in Wuling Mountain Area.The improvement of territorial development intensity had interval effect on ecological security,showing an inverted U-shaped curve relationship of‘strengthening-weakening’.If the threshold value was between 0.158 to 0.309,the territorial development had a significant threshold effect on building the ecological security barrier.[Conclusion]During the study period,the territorial development intensity and its threshold in the Wuling Mountain Area gradually increased,and there was obvious spatial and temporal heterogeneity in the degree of i
作者
陈勤昌
王兆峰
Chen Qinchang;Wang Zhaofeng(College of Tourism,Hunan Normal University,Changsha 410081,China)
出处
《水土保持研究》
CSCD
北大核心
2024年第2期287-298,309,共13页
Research of Soil and Water Conservation
基金
国家自然科学基金(41771162,41971188)
湖南省国内一流培育学科建设项目(5010002)。
关键词
国土空间开发
生态安全
时空异质性
武陵山区
territorial development
ecological security
spatial and temporal heterogeneity
Wuling Mountain Area
