摘要
良好的生态环境有利于社会经济的健康发展。在城市发展过程中加强生态监测及约束,有利于城市的可持续发展。本研究通过遥感生态指数(RSEI)监测评估2014和2018年的海南省三亚市生态环境质量状况,将RSEI监测结果依据生态环境质量等级划分出不同生态约束条件,结合PLUS模型模拟2030年不同生态约束情景的三亚市土地利用变化。结果表明:2014—2018年间三亚市RSEI从0.656下降至0.632,整体生态环境质量变差,生态环境退化区域主要发生在经济开发热点区域。2030年的模拟显示,自然发展情景中建设用地扩张显著,同时侵占林地和耕地,对生态安全和耕地造成威胁;结合RSEI的2种生态约束情景模拟显示,建设用地扩张和林地下降趋势均得以控制,严格生态约束情景对生态空间的保护作用更为明显。研究结果表示加强生态约束可以有效抑制城市建设用地无序扩张以及维持森林数量,有助于可持续发展的实现。
[Background]With the continuous promotion of urbanization in China,the contradiction between ecological protection and economic development is becoming increasingly prominent.Strengthening the monitoring and rigid constraints of the ecological environment in the process of urban development is conducive to ecological environmental protection and provides a carrying capacity base for sustainable economic and social development.Sanya is a typical city in the tropical region of China and has faced many ecological and environmental problems in the rapid expansion of the city in recent years.Therefore,there is an urgent need to conduct quantitative spatial assessment and scenario simulation studies on the ecological environment of Sanya city by establishing a research framework for land use change and ecological environment monitoring.[Methods]This study assessed and monitored the ecological quality of Sanya city based on Landsat remote sensing images in 2014 and 2018,using the Remote Sensing Ecological Index(RSEI)formed by integrating four ecological elements of greenness,humidity,heat and dryness by principal component analysis.The RSEI monitoring results were classified into different ecological constraints according to ecological quality levels,and combined with the PLUS model to simulate land use changes in Sanya city in 2030 under three scenarios of natural development,moderate ecological constraints and strict ecological constraints.[Results]The RSEI of Sanya city decreased from 0.656 to 0.632 between 2014 and 2018.Although the greenness,humidity increasing and heat decreasing improved the ecological environment,but the increasing in dryness contributed more to ecological damage than the first three,resulting in a decrease in the overall RSEI in Sanya city.From 2014 to 2018,the area of RSEI with excellent ecological quality decreased by 132.19 km^(2)and the area of RSEI with poor ecological quality increased by 14.48 km^(2).As a result,the overall ecological quality of Sanya city has deteriorated and ecological degradation occurred mainly in the hot spots of the city s economic development.Based on the PLUS model to simulate land use changes in Sanya city in 2030,the results showed that under the natural development scenario,construction land expanded significantly,mainly by encroaching on woodland and arable land,with the total reduction of woodland being the largest,indicating that this scenario posed a threat to ecological and arable land security.The simulation results of the two ecological constraints scenarios combined with RSEI showed that the expansion of construction land and the decline of woodland were both controlled,and the strict ecological constraints scenario had a more obvious effect on the protection of ecological space.[Conculsions]The study shows that RSEI-based can achieve rapid and effective monitoring of the regional ecological environment.According to the scenario simulation combining ecological constraints,it is shown that strengthening ecological constraints can effectively reduce the significant expansion of construction land and the maintenance of forest quantity.This study may provide reference cases for the implementation of land use planning and sustainable development under ecological constraints in tropical cities.
作者
胡珂
韩念龙
于淼
张育诚
HU Ke;HAN Nianlong;YU Miao;ZHANG Yucheng(School of Public Administration,Hainan University,570228,Haikou,China;School of Public Administration,Nanjing Agricultural University,210095,Nanjing,China;School of Geography and Tourism,Huizhou University,516007,Huizhou,Guangdong,China)
出处
《中国水土保持科学》
CSCD
北大核心
2023年第1期101-109,共9页
Science of Soil and Water Conservation
基金
海南省自然科学基金“人类活动视角下的海南岛中部山区生态系统服务功能权衡与模拟”(421RC1034)。
关键词
遥感生态指数
PLUS模型
生态约束情景模拟
土地利用变化
三亚市
remote sensing ecological index
PLUS model
ecological constraint scenario simulation
land use changes
Sanya city
