长时间序列声音指数在鸟类物种丰富度评价中的应用

Evaluating Avian Species Richness Using LTSI of Sound Acoustic Indices

以神农架国家公园体制试点区为例,根据长时间序列声音数据,提取多种声音指数,并评估这些声音指数与该地鸟类物种丰富度之间的相关性,同时分析相关性良好的声音指数在长时间范围内的表现差异,探究神农架不同季节鸟类活动变化情况及每日变化的关键时刻。结果表明:声音复杂度指数、生物声学指数、归一化声景指数与神农架鸟类物种丰富度相关性显著。神农架鸟类声学活动在春夏秋季都表现出相似的日变化规律。在夏季时鸟类声音活动强度及持续时间均大于其余2季,冬季鸟类声音活动较少。在神农架进行被动声学监测时,需要注意排除天气、人类活动、其他物种对于声音指数分析结果的影响。

With the Long Time Series Index(LTSI)of soundfrom the Shennongjia National Park Pilot Area,we extracted a variety of acoustic indices and evaluated the correlation between the indices and the avian species richness in the area.The performance difference of the acoustic indices with good correlation in the long-term range was analyzed to obtain the change of bird activities in different seasons and key moments of daily changes in Shennongjia.The results show that:firstly,the acoustic complexity index,bio-acoustic indexand normalized difference soundscape index are significantly correlated with the avian species richness in Shennongjia.The acoustic activities of Shennongjia birds show similar diurnal changes in spring,summer,and autumn,and both the intensity and duration of the acoustic activity in summer are obviously stronger and longer compared with the other two seasons;while the acoustic activity of birds is much less in winter.When passive acoustic monitoring is carried out in Shennongjia,care should be taken to exclude the influence of weather,human activities and the other species on the results of acoustic index analysis.