摘要
【目的】为科学认知、评价鄱阳县生态环境脆弱性,合理调控保护生态环境,顺利开展生态修复分区和国土空间规划工作。【方法】基于生态敏感性—生态恢复力-生态压力度(SRP)概念模型,分别选取高程、坡度、地形起幅度、景观多样性指数等15个指标,采用熵权法对层次分析法修正确定指标权重,结合全局Moran’s I指数和LISA聚类图、变异系数,从县域整体生态脆弱性表征、县域整体生态脆弱性空间格局、乡镇尺度生态脆弱性、不同地类尺度生态脆弱性、生态脆弱性时空演变5个方面,对鄱阳县生态脆弱性进行了探讨。【结果】(1)从县域整体生态脆弱性特征来看,2005年整体为微度脆弱,2010年和2015年为中度脆弱,生态脆弱性有所加剧,由微度脆弱转变为中度脆弱,加剧的幅度先大后小。(2)从县域整体生态脆弱性空间格局看,空间格局逐渐趋于均衡。县域生态脆弱性呈现西南高,东北低的态势。生态脆弱性指数由西南向东北逐渐降低。生态脆弱性存在显著的空间集聚特征,高高聚集区主要分布在西南部地区,低低聚集区主要分布在东北部地区。(3)从乡镇尺度生态脆弱性来看,研究期间微度脆弱、轻度脆弱的乡镇数量显著减少,中度脆弱和重度脆弱的乡镇数量显著增加。(4)从不同地类尺度生态脆弱性特征来看,2005年和2010年,生态脆弱性程度由高到低依次表现为:水域、建设用地、草地、耕地、未利用地、林地。2015年,林地跃居第二,这表明林地生态环境遭受了一定的破坏。耕地和林地和水域的脆弱性指数持续增加。(5)从生态脆弱性时空演变特征来看,2005年,以微度脆弱和轻度脆弱为主,到2010年转变为以轻度脆弱和中度脆弱为主,到2015年,转变为以中度和重度脆弱为主。从空间上来看,生态脆弱性高值区呈现从西南向东北蔓延的趋势。【结论】研究结果将为鄱阳县的国土
[Objective]This study aims to scientifically understand and evaluate the eco-environmental vulnerability,regulate and protect the ecological environment,and smoothly implement ecological restoration zoning and territorial Spatial planning in Poyang County.[Method]Based on the ecological sensitivity-resilience-pressure(SRP)conceptual model,this study selected 15 indices including elevation,slope,terrain elevation,landscape diversity index,etc.,and determines the index weight by using entropy-right method to modify the analytic hierarchy process(AHP).In addition,the global Moran’I index and LISA clustering map,coefficient of variation were used together to discuss the eco-environmental vulnerability in Poyang County from five aspects:the characterization of the overall ecological fragility of the county,the spatial pattern of the overall ecological fragility of the county,the ecological fragility of the township scale,the ecological fragility of different land types.[Result](1)Regarding the overall ecological fragility characteristics of the county,the overall situation was negligibly vulnerable in 2005,and medially vulnerable in 2010 and 2015.The ecological fragility has increased,from negligible vulnerability to medium vulnerability,and the magnitude of the aggravation was first large and then small.(2)Regarding the overall ecological vulnerability spatial pattern of the county,the spatial pattern gradually became balanced.The ecological vulnerability of the county was high in the southwest and low in the northeast.The ecological vulnerability index gradually decreased from the southwest to the northeast.Ecological vulnerability had significant spatial agglomeration characteristics.High-high-aggregation areas were mainly distributed in the southwestern region,and low-low-aggregation areas mainly in the northeast.(3)Regarding the township-scale ecological vulnerability,the number of towns with negligible vulnerability and light vulnerablity decreased significantly during the research period,and the number of tow
作者
常溢华
蔡海生
CHANG Yihua;CAI Haisheng(Ecology Key Laboratory of Po-yang Lake watershed in Jiangxi Province/Development Research Center of Selenium-rich Agricultural Industry,Jiangxi Agricultural University,Nanchang 330045,China;Jiangxi Tourism and Commerce Vocational College,Nanchang 330100,China)
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2022年第1期245-260,共16页
Acta Agriculturae Universitatis Jiangxiensis
基金
国家自然科学基金项目(31660140)。
关键词
生态脆弱性
动态评价
SRP概念模型
多尺度
鄱阳县
eco-environmental vulnerability
dynamic assessment
sensitivity-resilience-pressure(SRP)conceptual model
multiscale
Poyang County