摘要
选取西北半干旱区榆林市为研究区域,以2010年、2015年和2021年3个时间节点为时间样本,结合社会经济统计数据及遥感空间数据,采用压力-状态-响应模型(PSR模型)构建生态环境脆弱性评价指标体系,在格网GIS技术的支持下,对指标进行100 m×100 m尺度下的空间化表达,利用GIS空间分析技术定量分析了研究区生态环境脆弱性时空分布特点及集聚特征,并利用空间马尔科夫链对生态环境脆弱性演化特征及邻域效应进行探究。结果表明:(1)2010—2021年榆林市生态环境脆弱性整体表现出北高南低的空间分布格局;(2)2010—2021年榆林市生态环境脆弱性空间分布表现出较强的正相关,12年间高高集聚与低低集聚区空间分布变化较大;(3)榆林市生态环境脆弱性演化以负向演化(高等级向低等级演化)为主,生态环境脆弱性整体呈现降低态势;(4)邻域背景在生态环境脆弱性演化过程中起重要作用,研究区生态环境脆弱性时空演化表现出较强的邻域趋同性。该研究揭示了榆林市生态环境脆弱性时空格局及邻域趋同效应,以期为区域生态环境保护政策制定与调整提供方向。
The study area,Yulin City,was chosen in semiarid region of the northwestern China.Using 3 temporal samples of 2010,2015 and 2021,integrating socioeconomic statistical data and remote sensing spatial data,this paper constructed an ecological environment vulnerability evaluation index system based on the pressure-state-response(PSR)model.Supported by grid-based GIS technology,the indexes were spatially represented at a 100 m×100 m scale.GIS spatial analysis technologies were employed to quantitatively analyze the spatial and temporal distribution characteristics and aggregation patterns of ecological environment vulnerability in the study area.The spatial Markov chain method was further applied to investigate the evolutionary characteristics and neighborhood effects of ecological environment vulnerability.The results were as follows:①The ecological environment vulnerability in Yulin City as a whole showed the spatial distribution pattern of"higher in the north and lower in the south"from 2010 to 2021.②The spatial distribution of ecological environmental vulnerability in Yulin City from 2010 to 2021 showed strong positive autocorrelation,and there were great changes in the spatial distribution of high-high and low-low agglomerations during 12 years.③Negative evolution(transition from higher to lower vulnerability grades)dominated the vulnerability changes in Yulin City,indicating that the overall situation of ecological environmental vulnerability was reduced.④Neighborhood context played a crucial role in vulnerability evolution,demonstrating strong spatial convergence in vulnerability patterns.The study revealed the spatial and temporal patterns and neighborhood convergence effects of ecological environmental vulnerability in Yulin City,so as to provide guidance for formulating and adjusting regional ecological conservation policies.
作者
王力力
黎鹏飞
高雨茜
刘喆
WANG Lili;LI Pengfei;GAO Yuqian;LIU Zhe(Shaanxi Huadi Survey and Design Consulting Co.,Ltd.,Xi′an Shaanxi 710000)
出处
《现代农业科技》
2025年第11期112-121,共10页
Modern Agricultural Science and Technology
关键词
生态环境脆弱性
时空格局
邻城效应
格网GIS
空间马尔科夫链
半干旱地区
陕西榆林
ecological environment vulnerability
spatial and temporal pattern
neighborhood effect
grid-based GIS
spatial Markov chain
semiarid region
Yulin Shaanxi
