Nutrient and eutrophication characteristics of the Dongshan Bay,South China   总被引：1，自引：0，他引：1  

陈宝红  暨卫东  周开文  贺青  傅婷婷 《中国海洋湖沼学报》2014,32(4):886-898

We recorded NO 3-N, NO 2-N, NH 4-N, PO 4-P, SiO 3-Si, salinity, and temperature data at 10 stations in the Dongshan Bay in May, June, July, August, October, and November 2008, analyzing nutrient and eutrophication characteristics. The mean concentration of dissolved inorganic nitrogen(DIN) was 0.30–0.40 mg/dm 3; generally, NO 3-N was the main form in most areas. The mean concentrations of PO 4-P and SiO 3-Si were 0.040–0.060 mg/dm 3 and 1.00–1.50 mg/dm 3, respectively. We proved that the majority of the SiO 3-Si in the Dongshan Bay came from the Zhangjiang River, with some coming from the Bachimen Strait. DIN originated from both the Zhangjiang River and the Bachimen Strait. Most PO 4-P originated from the Bachimen Strait, and some came from the Zhangjiang River. We found that P was an overall limiting factor to the phytoplankton community in most of the Dongshan Bay, and that Si and N were in surplus. However, near the Bachimen Strait Si became a limiting factor, especially for diatoms, while P and N were in comparative surplus. We used a potential eutrophication assessment method to analyze eutrophication, and showed that the most serious eutrophication occurred near the Zhangjiang River estuary and near the Bachimen Strait. In 2008, DIN levels were four times higher than that in 1988; PO 4-P levels were threefold higher, while SiO 3-Si was approximately double. Dissolved nutrients increased between 1988 and 2008. DIN increased at the greatest rate comparing to PO 4-P and SiO 3-Si, thus the N/P and N/Si mol ratios increased. Further studies on the effects of high DIN concentrations on the phytoplankton communities and marine ecosystems of the Dongshan Bay are needed.  相似文献   

台湾海峡西部营养盐变化特征——Ⅳ.水系混合及浮游植物摄取对Si:N:P比值的影响     

暨卫东  黄尚高 《海洋学报》1992,(2)

本文取自福建海岸带及台湾海峡西部硅酸盐、无机氮与磷酸盐的调查数据进行相关分析,结果表明各季ΔSi:ΔN:ΔP比值是比较固定的,现场的Si:N:P浓度比值是变化的,秋、冬季ΔN:ΔP比值接近Redfield比值.并通过各季N:P比值的平面分布,来探讨台湾海峡水系交错混合,浮游植物摄取转移对N:P比值的影响,结果表明沿岸大陆水中N:P比值高,外海水中N:P比值接近Redfield比值;在浮游植物生长繁殖旺盛的局部海区,磷酸盐几乎被消耗殆尽出现N:P比值极大区.在营养盐中磷是浮游植物生长繁殖的限制因素.  相似文献   

The application of elastic impedance inversion in reservoir prediction at the Jinan area of Tarim Oilfield   总被引：1，自引：0，他引：1  

杨金华  李国发刘洋　姜卫东 《应用地球物理》2007,4(3):201-206

The Triassic reservoir in the Jinan area of Tarim Oilfield consists largely of interbedded sand and shale. Because of the large overlap between sandstone and shale impedance, it is difficult to distinguish sandstone from shale by acoustic impedance alone. Compared to acoustic impedance, elastic impedance contains more lithologic and physical information of the reservoir. Based on meticulous well-tie calibration, elastic impedance data volumes for 10°, 20°, and 30° emergence angles are obtained using pre-stack elastic impedance inversion. A non-linear statistical relationship between elastic impedance and shale content is set up by a PNN neural network. The non-linear mapping relationship is used to predict the reservoir shale content from elastic impedance, which will depict and predict the reservoir oil-bearing sands.  相似文献   

用VB实现在线升级     

裴宗寿  宋卫东 《青海气象》2007,(1):58-59,62

在VB中利用第三方控件bkDLControl可以实现在线下载,从而完成一些软件的在线升级。  相似文献   

建立稳定的法规制度全面鼓励外商投资中国矿业     

鲍荣华  闫卫东 《国土资源情报》2006,(5):26-29

一、虽然近几年我国矿业吸引外商投资得到快速发展,但还远远不够我国实行改革开放26年来,矿业领域也逐步对外开放,实行“利用两种资源,两个市场”的资源政策,矿业领域在“走出去,引进来”方面都取得了长足进展。2001年加入WTO之后,  相似文献   

全站仪检定中分级问题的探讨     

王冬梅  张卫东 《河南测绘》2003,(2):17-19

  相似文献   

南海表层水中的溶解态Cu,Pb, Zn,Cd   总被引：9，自引：0，他引：9  

霍文冕  暨卫东  许昆灿 《海洋学报》2002,24(4):44-50

于1998年“南海海洋环境调查”外业工作期间在南海的各个站位,按照严格的防沾污措施采集了106个表层海水样品.采用溶剂萃取-石墨炉原子吸收法对样品中的痕量重金属Cu,Pb,Zn,Cd含量进行了分析测试.测得各重金属的平均值如下:Cu 0.100 μg/dm3,Pb 0.060μg/dm3,Zn 0.086 μg/dm3,Cd 0.007μg/dm3,接近世界大洋水的浓度水平.各重金属的空间分布呈现出海区周边含量高于中央,浓度有自近岸向远海逐渐减小的趋势.相关分析的结果表明各重金属夏季相关性优于冬季,Cu与Cd存在良好的正相关关系,并且首次在南海表层水发现Cu,Cd与营养盐的相关关系.将重金属浓度值作数理统计分析,得到它们在南海的基线值.  相似文献   

台湾海峡西部营养盐变化特征——Ⅳ.水系混合及浮游植物摄取对Si:N:P比值的影响   总被引：5，自引：1，他引：5  

暨卫东  黄尚高 《海洋学报》1992,14(2):53-62

本文取自福建海岸带及台湾海峡西部硅酸盐、无机氮与磷酸盐的调查数据进行相关分析,结果表明各季ΔSi:ΔN:ΔP比值是比较固定的,现场的Si:N:P浓度比值是变化的,秋、冬季ΔN:ΔP比值接近Redfield比值.并通过各季N:P比值的平面分布,来探讨台湾海峡水系交错混合,浮游植物摄取转移对N:P比值的影响,结果表明沿岸大陆水中N:P比值高,外海水中N:P比值接近Redfield比值;在浮游植物生长繁殖旺盛的局部海区,磷酸盐几乎被消耗殆尽出现N:P比值极大区.在营养盐中磷是浮游植物生长繁殖的限制因素.  相似文献   

1998年南极中山站海洋气溶胶的化学组成及其来源判别   总被引：6，自引：0，他引：6  

黄自强  暨卫东  杨绪林  黄荣坦  汤荣坤  于涛  张功勋 《海洋学报》2005,27(3):59-66

从1998年3月7日至1999年3月2日历时12个月,在南极中山站连续采集52个海洋气溶胶样品,提供全部样品的13种化学元素铜、铅、锌、镉、铁、铝、锰、铬、钒、钾、钠、钙、镁含量的实测值.研究表明中山站气溶胶化学成分的含量具有季节性变化的特征.通过富集因子、相关分析、因子分析等方法判别中山站气溶胶化学成分的来源.  相似文献   

福建海岸带海水营养盐消长与温,盐浮游植物的关系   总被引：9，自引：0，他引：9  

暨卫东  黄尚高 《热带海洋》1989,8(2):55-64

  相似文献