Effects of land use change on groundwater quality in the Dianchi Lake Basin
CHEN Qing-fei1, CHEN An-qiang2, YE Yuan-hang1, MIN Jin-heng1, ZHANG Dan1
1. College of Resources and Environment, Yunnan agricultural University, Kunming 650201, China; 2. Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Science, Kunming 650201, China
Abstract: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 146km2, and the area of construction land increased by 279km2. From 2002 to 2020, the chemical type of shallow groundwater in the Dianchi Lake Basin changed from HCO3-·SO42--Mg2+to HCO3-·SO42--Ca2+. 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 NO3--N, showing a “sink” effect, while construction land was positively correlated with TN and NO3--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.
陈清飞, 陈安强, 叶远行, 闵金恒, 张丹. 滇池流域土地利用变化对地下水水质的影响[J]. 中国环境科学, 2023, 43(1): 301-310.
CHEN Qing-fei, CHEN An-qiang, YE Yuan-hang, MIN Jin-heng, ZHANG Dan. Effects of land use change on groundwater quality in the Dianchi Lake Basin. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 301-310.
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