| The accelerated urbanization process has led to serious fragmentation of the landscape pattern,degradation of the function of river and lake systems and uneven supply and demand of soil and water resources in the PRD region.It is important to explore the characteristics of the changing landscape pattern in the PRD region and its impact on the water use structure and water supply capacity for ecological protection.Based on the land use data of nine periods in the PRD region from 1980 to 2020 and the social and economic data of the same period,this paper adopts the landscape pattern analysis method to study the landscape pattern changes and their driving factors in the PRD region,and analyzes the impact of landscape pattern changes on the water use structure in the PRD region from the perspective of time and space,and also takes the Zhuhai-Macau region as an example,adopts the landscape pattern analysis method and the system dynamics method were used to analyze the trend of changes in watershed landscape connectivity and the characteristics of changes in the water supply system,and to calculate the water resources carrying capacity of the water extraction system in the Zhuhai-Macau region,with the following main conclusions:(1)In the PRD region,the area of forest land and arable land landscape patches showed an overall decreasing trend during 1980-2020,while the area of urban land landscape patches showed a significant increasing trend.The woodland patches are mainly distributed in the hilly areas of Huizhou,Jiangmen and Zhaoqing,the arable land landscape patches are mainly distributed in the central PRD,and the urban land landscape patches are mainly distributed in the flat areas along the Pearl River Delta such as Zhuhai,Zhongshan,Dongguan and Shenzhen.Woodland and arable land landscape elements as a whole are decreasing,landscape fragmentation is increasing,and landscape connectivity of urban land is increasing.The factors affecting the change of landscape pattern in the PRD region are mainly land use transformation,but also related to natural factors such as temperature and topography and human policies.The change of landscape pattern in the PRD region has a certain influence on the spatial distribution of water use and water use structure,with a decreasing trend of agricultural water use and an increasing trend of residential water use due to the transformation of arable land and urban land use.(2)The results show that the fragmentation of water landscape patches in the Zhuhai-Macao region gradually increased from 1980 to 2015,and the connectivity of the water landscape deteriorated;from 2015 to 2020,the connectivity of the water landscape was restored.The main driving factor for the change of landscape pattern in Zhuhai-Australia region is the change of land use.The area of urban land in Zhuhai-Australia region increased significantly during 1980-2020,and the implementation of reclamation projects led to a significant reduction of marine and water area,resulting in the shrinking area of water landscape patches and serious landscape fragmentation.There has been some improvement.(3)The water resources carrying capacity of the water extraction system in Zhuhai and Macao is calculated,and four scenarios of current development,environmental priority,economic priority and comprehensive development are set up for simulation.The results show that the current development scenario cannot meet the future water supply demand of Zhuhai and Macao,and the water resources carrying capacity under the comprehensive development scenario is the highest,and the total water consumption by 2030 can meet the requirements of the strictest water resources management system in Guangdong Province The target of "total water consumption from 2016 to 2030 is 684 million m~3",which can effectively relieve the water supply pressure in Zhuhai.In view of the current situation that water consumption in Zhuhai and Macao is increasing year by year,the effective solution is to improve the efficiency of industrial and agricultural water use and the utilization rate of recycled water. |
PDF Full Text Request