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声学学报 2008年第5期33卷 419-424页

作者：季桂花李整林戴琼兴中国科学院声学所南海研究站

利用一次夏季浅海水文实验资料,数值仿真研究有线性内波和孤立子内波存在条件下的匹配场时间相关性。考察和总结了有内波存在时不同声源频率、声源深度和内波幅度等参数对匹配场时间相关的影响。研究结果表明:由于内波与声场的相互作用... 详细信息

利用一次夏季浅海水文实验资料,数值仿真研究有线性内波和孤立子内波存在条件下的匹配场时间相关性。考察和总结了有内波存在时不同声源频率、声源深度和内波幅度等参数对匹配场时间相关的影响。研究结果表明:由于内波与声场的相互作用,匹配场时间相关长度会随着线性内波的平均能流密度及孤立子内波幅度的增大而减小;频率越高,声波穿过内波场时的匹配场时间相关下降的越快;声源位于跃层下时的匹配场时间相关明显的优于跃层上的情况;孤立子内波距声源的位置对匹配场时间相关影响相对较小。

关键词：孤立子内波时间相关性匹配场浅海声源频率平均能流密度实验资料数值仿真

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The effects of the internal waves on temporal correlation of matched-field processing in shallow water

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Chinese Journal of Acoustics 2010年第1期29卷 23-32页

作者： JI Guihua LI Zhenglin dai qiongxin National Laboratory of Acoustics Institute of Acoustics Chinese Academy of Sciences Beijing 100190 Haikou Lab Institute of Acoustics Chinese Academy of Sciences Haikou 570105 Graduate University of Chinese Academy of Sciences Beijing 100190

Effects of linear and solitary internal waves on the temporal correlation of matched- field processing （MFP） in shallow water are numerically investigated for acoustic sources with different frequencies and depths based on oceanographic data from an experiment. It is shown that the temporal correlation of MFP decreases as the amplitude of solitary internal waves or the average energy density of linear internal waves increases. For acoustic source with lower frequency or located below the thermocline, the temporal correlation of MFP is less affected by internal waves, and the temporal correlation length of MFP is longer. Moreover, the effects of the range from solitary internal waves to acoustic source on the temporal correlation of MFP are relatively small.

关键词： The effects of the internal waves on temporal correlation of matched-field processing in shallow water MFP

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Genetic effects of historical anthropogenic disturbance on a long-lived endangered tropical tree Vatica mangachapoi

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Journal of Forestry Research 2018年第2期29卷 291-299页

作者： Zhicong dai Chuncan Si Deli Zhai Ping Huang Shanshan Qi Ying Lin Ruiping Wang qiongxin Zhong Daolin Du Jingjiang College Jiangsu University Institute of Environment and Ecology Academy of Environmental Health and Ecological SecuritySchool of the Environment and Safety EngineeringJiangsu University Key Laboratory of Modern Agricultural Equipment and Technology Ministry of Education and Jiangsu ProvinceJiangsu University Department of Biological and Chemical Engineering Jingdezhen University World Agroforestry Centre (ICRAF) Central and East-Asia Office Centre for Mountain Ecosystem Studies(CMES) Kunming Institute of BotanyChinese Academy of Sciences College of Life Sciences Hainan Normal University

The endangered Vatica mangachapoi,a longlived,tropical tree with economic and ecological importance found in Hainan,China,was used to assess the hypothesis that historical human activities in Hainan’s tropical rain forest could have negative effects on the genetic diversity of *** hundred and twenty individuals from 11 natural populations—which were classified into three groups according to levels of disturbance—were sampled and analyzed with *** genetic diversity of *** is high at the species level,it is relatively low within populations.A significant genetic differentiation occurs among different disturbance *** isolation-by-distance indicated relevant historical anthropogenic *** findings showed that historical human disturbances significantly increase the genetic differentiation and slightly decrease the genetic diversity of long-lived tree *** targeting conservation actions were recommended.

关键词： Endangered plant Genetic variability Human disturbance Tropical forest Vatica mangachapoi

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