水资源与水工程学报2024，Vol.35Issue(2)：48-59,12.DOI:10.11705/j.issn.1672-643X.2024.02.06
三峡库区多时空尺度土地利用和景观格局对水质的影响
Impact of land use and landscape pattern on water quality on multiple temporal and spatial scales in the Three Gorges Reservoir area
摘要
Abstract
To investigate the response of water quality to land use and landscape pattern of different scales,this study analyzed the spatial and temporal heterogeneity of water quality and the characteristics of land use and landscape patterns in multi-scale riparian buffer zones based on the hydrological and water quality data of seven transects in the Three Gorges Reservoir area from 2019 to 2021 and the land use da-ta in 2020.Correlation analysis and redundancy analysis(RDA)were also used to determine the effects of land use and landscape patterns on water quality indicators and the optimal scale of influence.Then,partial least squares regression(PLSR)was used to explore the key influencing factors under the optimal scale of influence.The results show that the overall water quality condition in the Three Gorges Reservoir area was stable,the water quality in the dry water period was better than that in the wet period,and the water quality condition was mainly affected by non-point source pollution,tributary confluence,the phos-phorus industry and urbanization.Furthermore,the landscape patches in the small-scale buffer zone were severely fragmented,but more diversified;cultivated land was the dominant landscape type in the reser-voir area,and its increased fragmentation was conducive to improving the aquatic environment;forest and grassland had a better purifying effect on the water environment in the dry period than in the wet period,whereas waters were the main source of nitrogen and phosphorus pollutants in the river.Generally,the explanatory ability of land use and landscape patterns on water quality indicators was higher in the wet pe-riod than in the dry period,and was strongest on the 300 m buffer scale,where cultivated land,grass-land,waters and patch density(PD)were the key variables influencing the water quality indicators.关键词
水质/时空尺度/景观格局/土地利用/偏最小二乘回归(PLSR)/三峡库区Key words
water quality/temporal and spatial scale/landscape pattern/land use/partial least squares regression(PLSR)/Three Gorges Reservoir area分类
资源环境引用本文复制引用
赵灿,李毅,吴雷祥,黄伟,关荣浩..三峡库区多时空尺度土地利用和景观格局对水质的影响[J].水资源与水工程学报,2024,35(2):48-59,12.基金项目
三峡水库幸福河湖建设研究项目(WE1222B112022) （WE1222B112022）
三峡工程运行安全综合监测系统,库区维护和管理基金项目(2136703) （2136703）
