Exploration of dynamic changes of sound diversity based on acoustic index in the Shennongjia National Park, China

doi:10.12302/j.issn.1000-2006.202208003

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (5): 39-48.doi: 10.12302/j.issn.1000-2006.202208003

Exploration of dynamic changes of sound diversity based on acoustic index in the Shennongjia National Park, China

LUO Li¹^,²(), HOU Yanan¹^,³, YANG Jingyuan⁴, YU Xinwen¹^,⁵^,^*(), GAO Lingwang², OUYANG Xuan¹^,⁵, YANG Minglun¹, GAO Jiajun¹, GUO Anqi¹, LIU Yukun¹

1. Institute of Forest Resource Information Techniques, CAF, Beijing 100091, China
2. College of Plant Protection,China Agricultural University, Beijing 100083, China
3. Department of Computer Science Engineering, Chengdu Neusoft University, Chengdu 611844,China
4. Scientific Research Institute of Shennongjia National Park Administration,Shennongjia Forest District 442421, China
5. Key Laboratory of Forestry Remote Sensing and Information System, NFGA, Beijing 100091, China

Received:2022-08-01 Revised:2022-09-28 Online:2023-09-30 Published:2023-10-10

Abstract

Abstract:

【Objective】The study aims to evaluate the response of acoustic indices to the dynamic changes of animal sound diversity, further to explore the characteristics of the variation of animal sound diversity in Shennongjia National Park, China, in order to provide a quantitative basis for the local ecological protection. 【Method】We deployed nine sound recording equipments in nine sampling sites in Shennongjia National Park, and sound recording data from May to July 2021 were obtained. A time series of eco-acosutic indices including acoustic complexity index (ACI), bioacoustic index (BI), normalized difference soundscape index (NDSI) were extracted from the recording data after noise reduction processing. Further the summer dynamic characteristics of these three acoustic diversity indices were analyzed.【Result】Results showed that the variation of ACI was not obvious during the recording period, while BI showed a double peak variation, NDSI index showed a triple or four peak variation. Results of the Mann-Kendall mutagenicity test showed that ACI only had a mutations at a few sampling sites, while BI and NDSI had mutation at most of the sampling sites. And the analysis of daily variations on the date of the index mutation suggested that weather and human disturbance are the main causes of the index mutation. Results of daily changes of acoustic indices showed that the variation of ACI was not obvious also, while BI and NDSI had a obvious diurnal variation trend, which was consistent with the species of dawn/dusk chorus. The spatial variation of acoustic indexes with altitude gradient indicated that ACI and BI have the maximum value in the middle altitude area, and ACI has a strong correlation with the altitude, while the NDSI has no obvious change.【Conclusion】Our results demonstrated that BI and NDSI could better reflect the dynamic changes of animal sound diversity over time, and the changes of animal sound diversity in Shennongjia National Park showed a multi-peak variation during the recording period, and weather and human activities would cause the abrupt change. The ACI can well explain the spatial variation of animal sound diversity, and the maximum diversity was found in the middle altitude area.

Key words: acoustic index, biodiversity, acoustic complexity index (ACI), bioacoustic index (BI), normalized difference soundscape index (NDSI), Shennongjia National Park

CLC Number:

Q958.1

LUO Li, HOU Yanan, YANG Jingyuan, YU Xinwen, GAO Lingwang, OUYANG Xuan, YANG Minglun, GAO Jiajun, GUO Anqi, LIU Yukun. Exploration of dynamic changes of sound diversity based on acoustic index in the Shennongjia National Park, China[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(5): 39-48.

Figures/Tables 7

Table 1

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采样点编号及位置 location of sampling site and its No.	经纬度/(°) longitude and latitude	海拔/m altitude	周围环境 surrounding
1-大龙潭 Dalongtan	110.29E,31.49N	2 184.88	溪流旁
2-观音洞 Guanyindong	110.27E,31.49N	2 375.36	指向峡谷
3-长横二线 Changhengerxian	110.29E,31.46N	2 456.36	坡中
4-神农谷 Shennonggu	110.26E,31.44N	3 011.28	坡顶
5-官门山 Guanmenshan	110.38E,31.44N	1 396.46	坡顶
6-大九湖 Dajiuhu	110.01E,31.48N	1 741.78	平地
7-鱼儿沟 Yu’ergou	110.33E,31.53N	1 802.42	坡底
8-仟家坪 Qianjiaping	110.41E,31.41N	1 720.98	坡底
9-酒壶坪垭口Jiuhuping	110.36E,31.49N	1 816.62	坡中

Exploration of dynamic changes of sound diversity based on acoustic index in the Shennongjia National Park, China

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