湖泊科学2024，Vol.36Issue(4)：1096-1109,中插11-中插15,19.DOI:10.18307/2024.0423
极端天气下三峡库区土地利用对河流水质的多时空尺度影响
Effects of land use on river water quality at multiple spatial and temporal scales in the Three Gorges Reservoir area under extreme weather conditions
摘要
Abstract
To explore the cause-effect relationship between river water quality and land use in the basin under extreme weather,this study collected several datasets including land use indexes at multiple spatial scales(1000 m river buffer zone,500 m riparian buffer zone and sub-basin),water quality data in dry season(November 2019),rainy season-flood season(July 2020)and rainy season-arid season(August 2022).Based on the collected datasets,we explored the effects of land use at multiple spatio-temporal scales on river water quality in the basin,and thus determined the best spatial and temporal scale for protecting water quality and planning land use pattern in the basin and the critical predictors of water quality.Our results showed that the river water quality of the basin was affected by extreme weather.Rainfall would enhance the dilution capacity of the water body.High temperature would accelerate the microorganism reaction rate in the water.The water quality is better in the rainy season-flood season,followed by the rainy season-arid season.The water quality in the dry season is poor.The impact of land use on water quality was affected by both spatial and temporal scales.Land use had the most significant impact on river water quality at the scales of sub-watershed and dry season.Cultivated land,forest land,patch density,largest patch index and edge density were the most significant explanatory vari-ables affecting river water quality.Among them,forest land had a negative correlation with most water quality indicators,while con-struction land,cultivated land and patch density had a positive correlation with some of the water quality indicators.The results of this study provided a scientific basis for managing land use pattern and protecting river water quality,and was thus important for the sustainable development of human living environment and ecological protection.关键词
河流水质/土地利用指数/多时空尺度/冗余分析/三峡库区Key words
River water quality/land use indices/multiple temporal and spatial scales/redundancy analysis/Three Gorges Reser-voir area引用本文复制引用
张琼,刘睿,张静,郑达燕,张柳柳,郑财贵..极端天气下三峡库区土地利用对河流水质的多时空尺度影响[J].湖泊科学,2024,36(4):1096-1109,中插11-中插15,19.基金项目
国家自然科学基金项目(42107091)、重庆市自然科学基金项目(CSTB2022NSCQ-MSX1046)、重庆市教委科学技术研究计划项目(KJQN2O2200517)和重庆师范大学基金项目(20XLB022)联合资助. （42107091）
