摘要
Abstract
Climate changes and land use changes are the most important factors affecting water quantity and quality.To further study the factors affecting water quality and quantity of large reservoirs in mountains and highland areas,the Dumu Reservoir Basin was taken as an example,the Spearman rank correlation coefficient method and the Kriging interpolation algorithm were used in this paper to analyze the impacts of climate and land use change on downstream water quality and quantity based on hydrological,water quality and remote sensing image data.The results showed that:(1)From 2018 to 2023,the rainfall in the Dumu Reservoir Basin was mainly concentrated in summer and autumn,accounting for 53.56％and 23.15％of the total annual rainfall,respectively;(2)the water quality of Dumu Reservoir Basin deteriorated significantly,and the over-the-limit factors,total nitrogen and permanganate index,increased significantly,which was due to the increase of non-point source pollution emissions such as rural domestic sewage,farming and free-range livestock and poultry breeding in the runoff area;(3)there was a significant positive correlation between inflow and inflow flow,rainfall and air temperature(inflow and rainfall:r=0.831,p＜0.01;inflow flow and air temperature:r=0.738,p＜0.01);and(4)forest land and grassland were positively correlated with water level and flow to specific extent,which played an important role in water conservation.Construction lands,cultivated lands,garden lands,water areas,lands for water conservancy facilities,and transportation lands were negatively correlated with water quality,because the pollutants produced by social and economic activities and fertilizers and pesticides in cultivated land flowed to the reservoir,and the degree of water pollution was increased.关键词
气候变化/土地利用变化/山地高原区/大型水库/水量水质/云南独木水库Key words
Climate change/land use change/mountainous mountains and highland areas/large reservoirs/water water quan-tity and quality/Dumu Reservoir,Yunnan分类
环境科学
