Bird diversity in different counties in Yangtze River Basin from 2011 to 2020.xlsx

The monitoring of breeding birds and wintering birds were conducted in 536 monitoring sites during 2011 and 2020. The monitoring sites were selected based on complementarity and stratified random sampling, covering all ecosystem types and elevation gradient. According to climatic characteristics, and activity rhythm of birds in the YRB, field surveys of breeding birds were conducted from March to July each year, covering the early and late breeding periods. A line transect method was used. The length of each line transect was set as 1–3 km. These line transects did not overlap and covered different habitat types and altitudinal belts. The sampling point method was used in the field surveys of wintering birds for some important lakes in the YRB, such as Poyang Lake, Dongting Lake, Caizi Lake, and other major lakes and wetlands.2011至2020年间，研究团队在536个监测样点开展了繁殖鸟类与越冬鸟类监测工作。监测样点的选取遵循互补性原则并采用分层随机抽样法，覆盖所有生态系统类型与海拔梯度。依据长江流域（Yangtze River Basin，YRB）的气候特征与鸟类活动节律，繁殖鸟类野外调查于每年3月至7月开展，覆盖繁殖期的早、晚两个阶段。调查采用样线法，每条样线长度设定为1至3千米，样线互不重叠且覆盖不同生境类型与海拔带。针对长江流域内鄱阳湖（Poyang Lake）、洞庭湖（Dongting Lake）、菜子湖（Caizi Lake）等重要湖泊及主要湿地，越冬鸟类野外调查采用样点法实施。