Study on the Relationship Between Landscape Patterns Index at Different Spatial Scales and Water Quality in the Upstream Watershed of Miyun Reservoir
As the largest surface drinking water source in Beijing,the correlation analysis between landscape pattern index and water quality at different spatial scales can better guide the protection of water sources in Miyun Reservoir.Taking the upper watershed of Miyun Reservoir as the study area,based on the water quality monitoring data and land use data,and utilizing the landscape pattern index method,correlation analysis and redundancy analysis,we analyzed the characteristics of the water quality change and the landscape pattern index change in the upper watershed of Miyun Reservoir in 2015,2018 and 2020,to reveal the correlation between the landscape pattern of the upper watershed of Miyun Reservoir and the water quality at different spatial scales.correlation.The results show that:the land use types in the buffer zone at different scales in the upper Miyun Reservoir watershed are mainly cropland,woodland and grassland.As the scale of the buffer zone increa-ses,the degree of landscape fragmentation decreases,the number of patches gradually increases.The degree of complexity gradually increa-ses,and the degree of separation between different types of patches gradually increases.There is not much difference in the connectivity of the dominant landscapes in the buffer zones at different scales,and the richness and homogeneity of the landscape composition is close.Ex-cept for TN,the water quality indicators of the upstream watershed basically meet the water quality standard of surface water classⅡ.Redun-dancy analysis reveals that the landscape pattern index in the 2 000 m buffer zone has the strongest ability to explain water quality.The 2 000 m buffer zone is a key area for improving water quality in the future.
water qualitylandscape pattern indexcorrelation analysisupstream of Miyun Reservoir
万方数据
维普
