国家重点基础研究发展计划项目No.2012CB417004;国家自然科学基金No.41173118,41061037;鄱阳潮湿地与流域研究教育部重点实验室江西师范大学主任开放基金资助项目No.ZK2013007;Supported by the National Basic Research Program of ChinaNo.2012CB417004,the National Natural Science Foundation of ChinaNo.41173118,41061037 and the Opening Fund of Key Laboratory of Poyang Lake Wetland and Watershed ResearchJiangxi Normal University,Ministry of Education No.ZK2013007