基金This work was supported by the National Training Program of Innovation and Entrepreneurship for Undergraduates （No. 201611319050）, Science and Technology Project of Jiangxi Provincial Department of Education （No. GJJ161097）, China Postdoctoral Science Foundation （No. 2016M600515）, Jiangxi Province Postdoctoral Science Foundation （No. 2017KY48）, the Open Research Fund of Jiangxi Province Key Laboratory of Water Information Cooperative Sensing and Intelligent Processing （2016WICSIP012）, and the Opening Fund of the Key Laboratory of Poyang Lake Wetland and Watershed Research （Jiangxi Normal University）, Ministry of Education （No. PK2017002）.