acoustic indices_autumn:Acoustic indices in autumn migratory periods (秋季迁徙期的声学指数值); acoustic indices_spring:Acoustic indices in spring migratory periods (春季迁徙期的声学指数值); percent present_autumn:the percentage of biophony aggregated half-hourly and by habitat and PSD values aggregated half-hourly and by habitat during the autumn migratory periods (秋季迁徙期各声音类型、各声学指数按每半小时处理后的均值); percent present_spring:the percentage of biophony aggregated half-hourly and by habitat and PSD values aggregated half-hourly and by habitat during the spring migratory periods (春季迁徙期各声音类型、各声学指数按每半小时处理后的均值)。