摘要
土地利用变化影响着浅层地下水水质,以滇池流域为研究对象,综合运用遥感影像解译、马尔科夫转移矩阵和冗余分析,对近20年(2002~2020)滇池流域土地利用和浅层地下水质变化进行分析,揭示长时间尺度下土地利用变化对浅层地下水水质的影响.结果表明:2002和2020年滇池流域土地利用类型以草地、林地和耕地为主,分别占总面积20.91%和17.43%、43.21%和37.99%、22.11%和17.08%,2002~2020年间耕地向建筑用地和林地、林地向草地和耕地、草地向林地和建筑用地转移概率分别为22.59%和20.72%、13.16%和10.49%、26.30%和15.65%,耕地面积减少146km^(2),建筑用地面积增加279km^(2).2002~2020年滇池流域浅层地下水化学类型由HCO_(3)^(-)·SO_(4)^(2-)-Mg^(2+)型转变为HCO_(3)^(-)·SO_(4)^(2-)-Ca^(2+)型,浅层地下水水质从I、II类下降至IV、V类,整体水质恶化.草地和林地与TN、NO_(3)^(-)-N呈负相关,表现为“汇”效应;建筑用地与TN、NO_(3)^(-)-N呈显著正相关(P<0.05),表现为“源”效应.可见,滇池流域土地利用空间格局变化显著影响着流域浅层地下水水质,建筑用地和耕地是导致滇池流域浅层地下水水质恶化的主要影响因素,合理规划、利用滇池流域土地资源对改善地下水水质具有重要意义.
Land use change impacts on shallow groundwater quality.The changes of land use and shallow groundwater quality in the Dianchi Lake Basin in recent 20years(2002~2020)were analyze by comprehensive use of remote sensing image interpretation,Markov transition matrix and redundancy analysis,and the impact of land use change on shallow groundwater quality in a long time scale was revealed.The results showed that the land use types in 2002 and 2020 in the Dianchi Lake Basin were mainly grassland,forest land and cultivated land,accounting for 20.91%and 17.43%,43.21%and 37.99%,22.11%and 17.08%of the total area,respectively.The transfer probabilities of cultivated land to construction land and forest land,forest land to grassland and cultivated land,and grassland to forest land and construction land were 22.59%and 20.72%,13.16%and 10.49%,26.30%and 15.65%from 2002 to 2020,respectively.The area of cultivated land decreased by 146km^(2),and the area of construction land increased by 279km^(2).From 2002 to 2020,the chemical type of shallow groundwater in the Dianchi Lake Basin changed from HCO_(3)^(-)·SO_(4)^(2-)-Mg^(2+)to HCO_(3)^(-)·SO_(4)^(2-)-Ca^(2+).The quality of shallow groundwater decreased from Class I and II to Class IV and V,and the overall water quality has deteriorated.Grassland and forest land were negatively correlated with TN and NO_(3)^(-)-N,showing a“sink”effect,while construction land was positively correlated with TN and NO_(3)^(-)-N(P<0.05),showing a“source”effect.Our results revealed that changes in the spatial pattern of land use in the Dianchi Lake Basin significantly affected the quality of shallow groundwater.Construction land and cultivated land were the main drivers that led to the deterioration of shallow groundwater quality in the Dianchi Lake Basin.Reasonable planning and utilization of land resources are crucial to improve groundwater quality in the Dianchi Lake Basin.
作者
陈清飞
陈安强
叶远行
闵金恒
张丹
CHEN Qing-fei;CHEN An-qiang;YE Yuan-hang;MIN Jin-heng;ZHANG Dan(College of Resources and Environment,Yunnan agricultural University,Kunming 650201,China;Agricultural Environment and Resources Institute,Yunnan Academy of Agricultural Science,Kunming 650201,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2023年第1期301-310,共10页
China Environmental Science
基金
国家自然科学基金资助项目(42067052,41977319)
云南省兴滇英才项目。
关键词
滇池流域
土地利用变化
浅层地下水
水质
Dianchi Lake Basin
land use change
shallow groundwater
water quality
作者简介
陈清飞(1999-),男,贵州铜仁人,硕士研究生,主要从事流域水土过程及其环境效应研究.发表论文2篇;责任作者:张丹,副教授,yidan33@163.com。
