土地利用结构与景观格局对开都河水质的影响  

Impact of Land Use and Landscape Patterns on Water Quality in Kaidu River

作　　者：王凯[1] 迪丽努尔·阿吉[1,2] 李平平 胡丛巧[1] 康佳佳 彭清清 WANG Kai;Diinuer·Aji;LI Pingping;HU Congqiao;KANG Jiajia;PENG qingqing(School of Geography and Tourism,Xinjiang Normal University,Urumqi 830054,P.R.China;Key Laboratory of Lake Environment and Resources in Arid area of Xinjiang,Urumqi 830054,P.R.China)

机构地区：[1]新疆师范大学地理科学与旅游学院,新疆乌鲁木齐830054 [2]新疆干旱区湖泊环境与资源重点实验室,新疆乌鲁木齐830054

出　　处：《水生态学杂志》2025年第1期45-57,共13页Journal of Hydroecology

基　　金：国家自然科学基金项目(42361006,41661007)。

摘　　要：探究土地利用结构与景观格局对干旱区河流水质的影响机制,对维护干旱区流域生态安全具有参考意义。基于开都河2021年丰水期和枯水期15个采样点的水质数据,以流域景观类型占比表征土地利用结构,景观指数表征景观格局,采用bioenv分析、冗余分析(RDA)等方法探讨土地利用结构与景观格局对开都河水质的影响。结果表明:(1)开都河属清洁、较清洁水质,枯水期水质略优于丰水期;(2)丰、枯水期的2000、5000 m半径缓冲区土地利用对水质解释率最佳,分别为63.81%、64.91%;景观格局对水质解释率的最佳缓冲区分别为500、200 m,解释率分别为73.88%、63.33%;(3)丰水期耕地对水质的贡献率最高为57.9%,景观指数LPI对水质的贡献率最高为48.8%;枯水期对水质贡献率最高的为草地68%,景观指数LSI对水质贡献率最高为21.6%;(4)丰水期,耕地、林地、水域的组合与水质的相关系数最高为0.4245,枯水期单一草地的组合与水质的相关系数最高为0.5129;丰水期NP、LPI、ENN_MN与水质的相关系数最高为0.0765,枯水期NP、PD、LPI与水质的相关系数最高为0.2163;(5)土地利用结构与景观格局对水质的交互作用在丰水期2000 m半径缓冲区内为18%,高于枯水期200 m半径缓冲区的11%。研究结果表明土地利用结构与景观格局都对开都河水质有较大影响,二者的交互作用在该影响中占有重要地位。Understanding the influence of land use and landscape on river water quality in arid regions is crucial for maintaining ecological security.In this study,Kaidu River was selected for a case study,and we investigated the impact of land use and landscape on water quality in the river using BIOENV and re-dundancy analysis(RDA),aiming to provide a theoretical reference for water quality management in riv-ers in arid regions.The study was based on a water quality investigation at 15 sampling sites along the up-per,middle and lower reaches of Kaidu River in 2021 during the wet and dry seasons.Based on remote sensing images of the Kaidu River basin in 2020,land use data of circular buffer regions around the sam-pling points at five scales(200 m,500 m,1000 m,2000 m,5000 m)were generated as water quality re-sponse units,and the land use structure was characterized by the proportion of different land use types in the watershed.The landscape pattern indices at each of the five spatial scales were extracted to character-ize the landscape pattern.Results show that:(1)Water quality of Kaidu River was clean or relatively clean at each sampling site,and water quality in the dry season was slightly better than that in the wet season.(2)Land use in the buffer zones at 2000 m and 5000 m scales explained water quality well during both the wet and seasons,with explanation rates of 63.81%and 64.91%,respectively.The landscape within the 500 m and 200 m circular buffer zones had the strongest explanatory power for water quality,with expla-nation rates of 73.88%and 63.33%,respectively.(3)During the wet season,the contribution rates of crop-land(57.9%)and the largest patch index(LPI:48.8%)for water quality was highest,while the land use type and landscape index with the highest contribution rates to water quality in dry season was grassland(68%)and landscape shape index(LSI:21.6%).(4)During the wet season,the combination of cropland,woodland and water had the highest correlation coefficients(0.4245)with water quality,and the highest corre

关 键 词：土地利用 景观格局 水质 开都河 

分 类 号：X522[环境科学与工程—环境工程]