Ecological risk assessment has an important research status in the field of environmental protection and sustainable development.Taking the Pearl River Basin as the study area,based on remote sensing image data and statistical data,the"pressure-state-response"model was used to construct the ecological risk evaluation system and carry out a study on the spatial and temporal evolution of the ecological risk values in the Pearl River Basin in 2014,2017 and 2020.The results of the study show that,(1)the risk level of the basin is low,and its spatial distribution is characterized by"low in the middle and high in the southeast-northwest".(2)The ecological risk transfer mainly occurs within the low-level risk level,and the transfer speed is faster in 2014-2017 than in 2017-2020,with a small transfer amplitude,mainly converting between neighboring levels.(3)In 2014-2017,risk improved in the central part of the basin and intensified from the center to the sides along the southeast-northwest direction,and in 2017-2020,risk improved in the western part of the basin and intensified in the rest of the region.The results of the study help to understand the distribution of ecological risks in time and space,and provide a scientific basis for managers to develop targeted risk management measures.
关键词
时空演变/生态风险/珠江流域
Key words
spacetime evolution/ecological risk/Pearl River Basin
维普
万方数据