厦门大屿-鸡屿白鹭自然保护区声环境分析

Analysis of acoustic environment of Dayu-Jiyu Egret Nature Reserve in Xiamen

用声级计对厦门大屿——鸡屿白鹭保护区的声环境进行了监测。结果表明:大屿岛保护区的噪声波动范围为42.9~64.6 dB,噪声等效声级(L_(eq))平均值为52.2 dB;鸡屿岛保护区的噪声波动范围为44.5~57.5 dB,噪声等效声级L_(eq)平均值为50.9 dB,均略高于保护区评价噪声值50 dB的标准;噪声变化主要受轮船航行与林内鸟虫鸣叫影响,大屿岛L_(eq)最大值为64.6 dB出现在树林内部,最小值为42.9 dB出现在远离航道一侧的海滩上;鸡屿岛L_(eq)最大值为57.5 dB出现在码头附近和人类活动区测点,最小值为44.5 dB则出现在远离码头及人类活动区测点。由监测结果结合鸟类观察结果可以分析声环境对保护区带来的正面影响和负面影响;并针对目前保护区的声环境现状,制定合理的降噪措施。

The acoustic environment of Dayu-Jiyu Egret Reserve in Xiamen was monitored by the sound level meter.The results showed that the noise fluctuation range of Dayu Island was 42.9~64.6 dB,and the average noise equivalent sound level(L_(eq))was 52.2 dB.The noise fluctuation range of Jiyu Island was 44.5~57.5 dB,and L_(eq) was 50.9 dB.Both of the two sound levels were slightly higher than the standard of 50 dB.The change of noise was mainly affected by the sailing of ships and the chirping of birds and insects in the forest.The maximum L_(eq) of Dayu Island was 64.6 dB,which was located inside the forest,and the minimum L_(eq) was 42.9 dB,which was located on the beach far away from the channel.While in Jiyu Island,the maximum L_(eq) value 57.5 dB was observed in the forest,and the minimum L_(eq) value 44.5 dB was observed near the wharf and human activity area.Based on the monitoring results and bird observation results,the positive and negative impacts of acoustic environment on the nature reserve could be analyzed.In view of the current situation of the acoustic environment in the reserve,some reasonable noise reduction measures were proposed.