Using over 3 500 first P arrival times recorded by nine digital seismic stations from Hainan Digital Seismic Net-work during 1999～2005,a 3-D P-wave velocity model of the crust under Hainan Island and adjacent regions...Using over 3 500 first P arrival times recorded by nine digital seismic stations from Hainan Digital Seismic Net-work during 1999～2005,a 3-D P-wave velocity model of the crust under Hainan Island and adjacent regions has been determined. The results show that the pattern of velocity anomalies in the shallower upper crust is somewhat associated with the surface geological tectonics in the region. A relative low-velocity anomaly appears north of the Wangwu-Wenjiao fault zone and a relative high-velocity anomaly appears south of the Wangwu-Wenjiao fault zone,corresponding to the depressed areas in north Hainan Island,where many volcanoes are frequently active and geothermal values are relatively higher,and the uplifted and stable regions in central and south of the Hainan Is-land. In the middle and lower crust velocities are relatively lower in east Hainan than those in west Hainan,possi-bly suggesting the existence of the upwelling of hot materials from the mantle in east Hainan. The pattern of veloc-ity anomalies also indicates that NW faults,i.e.,the Puqian-Qinglan fault,may be shallower,while the E-W Wangwu-Wenjiao fault may be deeper,which perhaps extends down to Moho depth or deeper.展开更多
Marginal water east of the Hainan Island is where internal waves occur frequently. Few studies have been conducted on these internal waves so far, and their formation mechanism remains unclear. In this study, the auth...Marginal water east of the Hainan Island is where internal waves occur frequently. Few studies have been conducted on these internal waves so far, and their formation mechanism remains unclear. In this study, the author uses the China-Brazil Earth Resources Satellite data (CBERS) to detect and calculate the distribution, direction, wavelength and amplitude of internal waves in this area. The results show that the direction of these internal waves is offshore and their wavelength is about 150-200 m. The internal waves can be postulated as formed by upwelling or reversed tide.展开更多
为了解不同典型红树林生境中小型底栖动物的丰度和干质量生物量及其影响因素,本文于2020年11月对东寨港红树林自然保护区5个典型红树林沉积物中的小型底栖动物及其沉积环境进行了调查研究。共发现17个小型底栖动物类群,线虫类和底栖桡...为了解不同典型红树林生境中小型底栖动物的丰度和干质量生物量及其影响因素,本文于2020年11月对东寨港红树林自然保护区5个典型红树林沉积物中的小型底栖动物及其沉积环境进行了调查研究。共发现17个小型底栖动物类群,线虫类和底栖桡足类分别为第一和第二优势类群,相对丰度分别为77.79%和15.65%。小型底栖动物的平均丰度和平均干质量生物量分别为(487.9±134.0)ind./10 cm ^(2)和(415.0±128.1)μg/10 cm ^(2)。小型底栖动物丰度在不同红树林间差异不显著,干质量生物量在不同红树林间差异显著,但丰度和干质量生物量同各环境因子间无显著相关性。5个红树林间小型底栖动物的群落结构存在显著差异,环境因子组合“沉积物偏态系数+叶绿素a浓度”能最好地解释小型底栖动物的群落结构。展开更多
基金The special project of Detection of Haikou City Earthquake Active Faults from the Tenth Five-year Plan of China Earthquake Administration (0106512)Joint Seismological Science Foundation of China (105086)CAS Key Laboratory of Marginal Sea Geology (MSGL0503).
文摘Using over 3 500 first P arrival times recorded by nine digital seismic stations from Hainan Digital Seismic Net-work during 1999～2005,a 3-D P-wave velocity model of the crust under Hainan Island and adjacent regions has been determined. The results show that the pattern of velocity anomalies in the shallower upper crust is somewhat associated with the surface geological tectonics in the region. A relative low-velocity anomaly appears north of the Wangwu-Wenjiao fault zone and a relative high-velocity anomaly appears south of the Wangwu-Wenjiao fault zone,corresponding to the depressed areas in north Hainan Island,where many volcanoes are frequently active and geothermal values are relatively higher,and the uplifted and stable regions in central and south of the Hainan Is-land. In the middle and lower crust velocities are relatively lower in east Hainan than those in west Hainan,possi-bly suggesting the existence of the upwelling of hot materials from the mantle in east Hainan. The pattern of veloc-ity anomalies also indicates that NW faults,i.e.,the Puqian-Qinglan fault,may be shallower,while the E-W Wangwu-Wenjiao fault may be deeper,which perhaps extends down to Moho depth or deeper.
基金supported by the Project of Knowledge Innovation of Chinese Academy of Sciences (KZCX1-YW-12-01)863(2008AA09Z112)+3 种基金National Natural Sciences Foundation of China(40876092)Program of Guangdong Provincial Science &Technology(2008B030303026)Natural Sciences Foundation of Guangdong Province(8351030101000002)Project of Knowledge Innovation of South China Sea Institute of Oceanology(LYQY200701)
文摘Marginal water east of the Hainan Island is where internal waves occur frequently. Few studies have been conducted on these internal waves so far, and their formation mechanism remains unclear. In this study, the author uses the China-Brazil Earth Resources Satellite data (CBERS) to detect and calculate the distribution, direction, wavelength and amplitude of internal waves in this area. The results show that the direction of these internal waves is offshore and their wavelength is about 150-200 m. The internal waves can be postulated as formed by upwelling or reversed tide.
文摘为了解不同典型红树林生境中小型底栖动物的丰度和干质量生物量及其影响因素,本文于2020年11月对东寨港红树林自然保护区5个典型红树林沉积物中的小型底栖动物及其沉积环境进行了调查研究。共发现17个小型底栖动物类群,线虫类和底栖桡足类分别为第一和第二优势类群,相对丰度分别为77.79%和15.65%。小型底栖动物的平均丰度和平均干质量生物量分别为(487.9±134.0)ind./10 cm ^(2)和(415.0±128.1)μg/10 cm ^(2)。小型底栖动物丰度在不同红树林间差异不显著,干质量生物量在不同红树林间差异显著,但丰度和干质量生物量同各环境因子间无显著相关性。5个红树林间小型底栖动物的群落结构存在显著差异,环境因子组合“沉积物偏态系数+叶绿素a浓度”能最好地解释小型底栖动物的群落结构。
