Traffic accessibility and the coupling degree of ecosystem services supply and demand in the middle reaches of the Yangtze River urban agglomeration,China

Journal of Geographical Sciences - The spatial relationships between traffic accessibility and supply and demand (S&D) of ecosystem services (ESs) are essential for the formulation of...     

中国土地利用变化生态环境效应的空间分异性与形成机理

中国复杂的自然要素、社会经济要素、区域发展战略和政策调控形成了当前中国不均衡的经济发展空间格局、土地利用空间格局和生态环境质量空间格局。厘清中国生态环境质量的空间格局及形成机理对中国土地资源的可持续利用和生态环境的有效保护具有重要的实践意义和价值。以往研究缺乏对中国县域尺度土地利用/土地覆被变化生态环境效应的空间分异性及形成机理的相关研究,本研究基于1995—2015年间中国土地利用现状遥感监测数据,尝试采用生态环境质量指数方法测度中国土地利用变化的生态环境效应,并且综合运用重心分析、热点分析工具（Getis-Ord G_i*）和地理探测器等研究方法,分析1995—2015年中国生态环境质量时空演变特征及形成机理。研究结果如下：① 东部季风区生态环境质量指数高于青藏高寒区和西北干旱区,东部季风区生态环境质量低值区主要分布在人口和经济集聚的城市群以及省会城市周边地区。研究期间中国生态环境质量重心持续向西北方向迁移;② 1995—2015年间中国生态环境质量变化的热点区域主要分布在西藏地区、新疆、重庆、贵州以及位于黄土高原的省份（青海、甘肃、宁夏、内蒙古、山西、陕西以及河南）境内,冷点区域主要分布在长江经济带沿线地区省份以及东南部沿海地区省份;③ 土地利用程度对于生态环境质量影响力显著强于其他因子,东部季风区的社会经济和交通区位因子对生态环境质量影响力强于青藏高寒区、西北干旱区和生态大区过渡带;④ 影响因子之间相互作用主要包括非线性增强作用和双因子增强作用两种类型,以非线性增强作用为主。     

黄河流域景观破碎化对土壤保持服务影响研究

基于2000年、2005年、2010年和2015年土地利用现状遥感监测数据,分别采用景观格局指数和当量因子法测度了黄河流域多尺度景观破碎化和土壤保持服务的时空特征,并且综合运用热点分析工具、普通最小二乘法和空间回归分析模型,探索了2000—2015年黄河流域多尺度土壤保持服务时空演变特征及景观破碎化对土壤保持服务的影响机制。结果如下：① 黄河流域土壤保持服务低值区主要集中分布在黄河流域上游青海-甘肃-宁夏-陕西-内蒙古沿线地区以及流域下游河南和山东,另外省会城市以及周边地区同样是土壤保持服务低值区,土壤保持服务具有显著的尺度依赖性;② 研究期间黄河流域土壤保持服务变化的热点区域主要分布在流域上游黄土高原地区,冷点区域主要分布在黄土高原的周边地区,不同尺度下土壤保持服务变化冷热点差异显著;③ 回归结果显示,经济社会因子与土壤保持服务具有显著的负相关;自然本底因子中海拔和林地面积比重与土壤保持服务具有显著的正相关;景观破碎化指数对土壤保持服务的影响差异性显著。未来黄河流域不同分区土壤保持和土地利用政策的制定不仅需要考虑自然本底和经济社会驱动因子,还应考虑多尺度景观格局破碎化以及空间溢出效应,跨区域协同治理对于黄河流域土地利用政策制定和生态系统保护具有重要现实意义。     

Coordinated development efficiency between cultivated land spatial morphology and agricultural economy in underdeveloped areas in China: Evidence from western Hubei province

Suitable spatial morphology of cultivated land is a basic requirement for sustaining agricultural economic development in mountainous areas. Coordinated development efficiency of cultivated land spatial morphology and agricultural economy(CECA) is of great practical significance to measure the efficiency of cultivated land use, and thereby promote regional rural revitalization. However, few studies to date have focused on coordinated development efficiency between cultivated land use and agricul...     

Impacts of traffic accessibility on ecosystem services: An integrated spatial approach

The continuous degradation of ecosystem services is an important challenge faced by the world.Improvements in transportation infrastructure have had substantial impacts on economic development and ecosystem services.Exploring the influence of traffic accessibility on ecosystem services can delay or stop their deterioration;however,studies on its impact are lacking.This study addresses this gap by analysing the impact of traffic accessibility on ecosystem services using an integrated spatial regression approach based on an evaluation of the ecosystem services value (ESV) and traffic accessibility in the Middle Reaches of the Yangtze River Urban Agglomeration (MRYRUA) in China.The results indicated that the ESV in the MRYRUA continuously decreased during the study period,and the average ESV in plain areas,areas surrounding the core cities,and areas along the main traffic routes was significantly lower than that in areas along the Yangtze River and the surrounding moun-tainous areas.Traffic accessibility continued to increase during the study period,and the high-value areas centred on Wuhan,Changsha,Nanchang,and Yichang were radially dis-tributed.The global bivariate spatial autocorrelation coefficient between the average ESV and traffic accessibility was negative.The average ESV and traffic accessibility exhibited signifi-cant spatial dependence and spatial heterogeneity.Spatial regression also proved that there was a negative association between the average ESV and traffic accessibility,and scale ef-fects were evident.The findings of this study have important policy implications for future ecological protection and transportation planning.