石角水库位于广东省北江清远水利枢纽和飞来峡水利枢纽之间,是北江干流第一座梯级电站河道型水库。由于水坝阻隔及其他人类涉水活动影响,库区渔业资源呈严重衰竭趋势。为了解其鱼类资源现状,采用分裂波束渔探仪EY60(120 k Hz,200 W)于2...石角水库位于广东省北江清远水利枢纽和飞来峡水利枢纽之间,是北江干流第一座梯级电站河道型水库。由于水坝阻隔及其他人类涉水活动影响,库区渔业资源呈严重衰竭趋势。为了解其鱼类资源现状,采用分裂波束渔探仪EY60(120 k Hz,200 W)于2015—2016年对库区鱼类资源及种群行为特征进行调查评估。结果显示,鱼类密度、鱼类行为及垂直分布均存在明显的时空差异,且鱼类个体呈现小型化。2015年12月、2016年3月和2016年6月鱼类平均密度分别为(0.008±0.0125)ind/m3、(0.1601±0.1123)ind/m^3和(0.0405±0.0449)ind/m^3。不同季节鱼类密度存在显著差异(P<0.05),冬春季节(12月、3月)鱼类主要集中于库首区域,夏季(6月)库尾为高密度区域。从垂直分布来看,鱼类主要分布于4~12 m水层,且不同区域间存在显著差异(P<0.01)。不同季节鱼类洄游行为差异明显,具体表现为夏季鱼类主要从库首向库尾水平洄游,垂直方向为向下洄游,而冬季则相反。本研究初步探明石角水库鱼类资源分布及其行为特征,也表明声学方法在研究较大空间尺度鱼类行为方面的适用性,研究结果可为北江渔业资源管理与保护提供参考依据。展开更多
This site lies on Shijiao-shan Hill at Shijiao-shan Village of Daxin Township in Pingnan County, Guangxi. Ancient cultural remains exist in the Shanding-dong, Dengzhan-yan and Niuhi-yan caves in the hill. In 1991, a r...This site lies on Shijiao-shan Hill at Shijiao-shan Village of Daxin Township in Pingnan County, Guangxi. Ancient cultural remains exist in the Shanding-dong, Dengzhan-yan and Niuhi-yan caves in the hill. In 1991, a rescuing excavation was carried out in the damaged Dengzhan-yan Cave, revealing an area of 15 sq m. In the Neolithic deposits, stone tools and pottery vessels occurred among findings both unearthed this time and picked up previously. The pottery includes fu cauldrons, ding tripods, zeng steamers, jars, dou stemmed vessels, dishes, spindle whorls, spindle-whorl-shaped objects, and distinctive white-coated black-painted shards. This is the late Neolithic cave-site first excavated in the region south of the Five Ridges.展开更多
文摘石角水库位于广东省北江清远水利枢纽和飞来峡水利枢纽之间,是北江干流第一座梯级电站河道型水库。由于水坝阻隔及其他人类涉水活动影响,库区渔业资源呈严重衰竭趋势。为了解其鱼类资源现状,采用分裂波束渔探仪EY60(120 k Hz,200 W)于2015—2016年对库区鱼类资源及种群行为特征进行调查评估。结果显示,鱼类密度、鱼类行为及垂直分布均存在明显的时空差异,且鱼类个体呈现小型化。2015年12月、2016年3月和2016年6月鱼类平均密度分别为(0.008±0.0125)ind/m3、(0.1601±0.1123)ind/m^3和(0.0405±0.0449)ind/m^3。不同季节鱼类密度存在显著差异(P<0.05),冬春季节(12月、3月)鱼类主要集中于库首区域,夏季(6月)库尾为高密度区域。从垂直分布来看,鱼类主要分布于4~12 m水层,且不同区域间存在显著差异(P<0.01)。不同季节鱼类洄游行为差异明显,具体表现为夏季鱼类主要从库首向库尾水平洄游,垂直方向为向下洄游,而冬季则相反。本研究初步探明石角水库鱼类资源分布及其行为特征,也表明声学方法在研究较大空间尺度鱼类行为方面的适用性,研究结果可为北江渔业资源管理与保护提供参考依据。
文摘This site lies on Shijiao-shan Hill at Shijiao-shan Village of Daxin Township in Pingnan County, Guangxi. Ancient cultural remains exist in the Shanding-dong, Dengzhan-yan and Niuhi-yan caves in the hill. In 1991, a rescuing excavation was carried out in the damaged Dengzhan-yan Cave, revealing an area of 15 sq m. In the Neolithic deposits, stone tools and pottery vessels occurred among findings both unearthed this time and picked up previously. The pottery includes fu cauldrons, ding tripods, zeng steamers, jars, dou stemmed vessels, dishes, spindle whorls, spindle-whorl-shaped objects, and distinctive white-coated black-painted shards. This is the late Neolithic cave-site first excavated in the region south of the Five Ridges.
