Abstract
Desert lakes are unique ecosystems found in oases within desert landscapes. Despite the numerous studies on oases, there are no reports regarding the spatiotemporal distribution and causes of eutrophication in the desert lakes that are located at the edge of the Linze Oasis in northwestern China. In this study, the seasonal shoreline and eutrophication of a desert lake were monitored using an unmanned aerial vehicle (UAV) and water sampling during three crop growth stages. The spatial extents of the shoreline and algal blooms and the chromophoric dissolved organic matter (CDOM) absorption coefficient were derived through UAV images. The desert lake shoreline declined during the crop growing stage, which exhibited the largest water demand and began to expand after this stage. The estimated CDOM absorption coefficient measurements and classified algal bloom area showed seasonal variations that increased from spring to late summer and then decreased in autumn. The first two crop growth stages accounted for most of the water and fertilizer requirements of the entire growth period, which may have contributed to large amounts of groundwater consumption and pollution and resulted in peak eutrophication of the lake in the second growth stage. However, the CDOM absorption coefficient of the third stage was not well correlated with that of the first two stages, suggesting that the lake may be affected by the dual effects of groundwater and precipitation recharge in the third stage. These results indicate that the water quality of desert lakes may be affected by agricultural cultivation. The agricultural demands for water and fertilizer may change the spatiotemporal changes in water quality in the lake, especially in the middle and early stages of crop growth.
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Funding
This research was jointly supported by the National Key Research and Development Program of China (2019YFC0507400), the Key Research Project of Frontier Science of the Chinese Academy of Sciences (QYZDJ-SSW-DQC040), and the National Natural Science Foundation of China (41877545, 41871065). Lixin Wang acknowledges partial support from the Division of Earth Sciences of National Science Foundation (NSF EAR-1554894) and the President’s International Research Awards from Indiana University.
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Luo, L., Zhao, W., Wang, L. et al. Are the shoreline and eutrophication of desert lakes related to desert development?. Environ Monit Assess 193, 43 (2021). https://doi.org/10.1007/s10661-020-08806-0
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DOI: https://doi.org/10.1007/s10661-020-08806-0