大亚湾大鹏澳水体石油烃含量变化及其与环境因子的关系   总被引：6，自引：0，他引：6  

王宪  徐鲁荣  李凌云  李文权 《台湾海峡》2002,21(2):167-171

根据对该水体中石油烃及各种环境因子DO、COD、BOD5、DIP、DIN、Chl-a含量的测定结果，描述了石油烃的分布特征讨论了环境因子和石油烃含量之间的关系，结果表明，石油烃的含量在海域中呈现出由湾内向湾外逐渐降低的趋势，且环境因子和石油烃含量之间存在着一定的线性关系。  相似文献   

福建福宁湾无机氮含量的变化特征及其对浮游植物的影响   总被引：2，自引：0，他引：2  

戴红  陈国斌  李伏庆 《台湾海峡》2006,25(1):59-67

本文根据2002-2003年福宁湾海域的监测资料对NO2-N、NO3＋N、NH4-N三态DIN的变化特征和相互关系进行分析，并分析其对浮游植物生物量的影响．研究表明：NO3-N、DIN含量均呈冬季最高、夏季最低，NO2-N含量秋季最高，冬季最低；福宁湾海域赤潮高发期水体DIN中三氮所占比例与年平均相比变化最大的是NO3-N，其次是NH4-N，NO2-N最小；NO3-N、DIN与盐度均呈明显负相关；NO3-N与DIN呈明显正相关；NO3-N是福宁湾海域DIN的主要存在形式；三态氮中仅NO3-N为福宁湾海域浮游植物生长限制因子；浮游植物对DIN的吸收主要以NO3-N形式为主。  相似文献   

1999年7月胶州湾东部赤潮生消过程生态环境要素分析     

卢敏  张龙军  李超  邹立  张经 《海洋科学进展》2001,19(4):43-50

根据 1 999年 7月 2 3 - 2 4日胶州湾东部赤潮发生海区的观测资料 ,结合同年 6 ,7,8月3个航次的数据 ,分析了赤潮前后水体浮游植物群落、叶绿素 a和营养盐等要素的变化特征。结果显示 ,本次赤潮为短角弯角藻 (Eucampia Zoodiacus)赤潮 ,总生物密度高达 1 .6× 1 0 10个 /m L。赤潮发生时 ,叶绿素 a浓度范围为 2 8.8～ 3 6 .0 mg/m3 ;温度、盐度变化不大 ,DO,p H值升高 ,营养盐浓度处于较低水平 ,其中 P降幅最大 ,N/P值则急剧上升 ,峰值为 2 4 7,P被认为是本次赤潮的限制因子 ;NO2 - N/NO3 - N的值变化很大 ,高于正常值。赤潮消退 ,各要素恢复正常  相似文献   

n Agriculture97-98F323.7J149     

《海洋学研究》2007,(1)

  相似文献   

大鹏湾的赤潮生态仿真模型   总被引：20，自引：3，他引：20  

夏综万  于斌  史键辉  王寿松 《海洋与湖沼》1997,28(5):468-474

通过海洋动力学和赤潮生物动力学相结合的方法，建立了一个赤潮发生的仿真模型。模型包括水动力、扩用和生物动力学三部分，综合考虑了潮流、营养物质等环境要素的时空变化对赤潮过程的影响，并以大鹏湾夜光藻赤潮为例进行了数值模拟。模型再现了赤潮发生前海水中营养物质的浓度一次明显的增高，而在赤潮发育盛期营养物质降至低谷的现象并反映了赤潮物质容易在海湾的角落等水交换不畅的地域聚集的情况。  相似文献   

Phosphorus and nitrogen cyclings in the pelagic system of hiroshima bay: Results of numerical model simulation     

Jutarat Kittiwanich  Tamiji Yamamoto  Toshiya Hashimoto  Keiko Tsuji  Osamu Kawaguchi 《Journal of Oceanography》2006,62(4):493-509

A numerical ecosystem model expressing both phosphorus and nitrogen cyclings in the pelagic system of Hiroshima Bay, Japan, was developed in order to investigate the seasonal variations of these elements and their annual budgets. Based on the geophysical and chemical structures of the bay, Hiroshima Bay was divided into northern and southern boxes, themselves divided into two layers of an upper 5 m and a lower layer according to the stratification of the water column. The model consists of equations representing all relevant physical and biological processes. The results revealed that the internal regeneration of materials was an important source of bioavailable nutrients for phytoplankton growth in the water column. The incorporation of phytoplankton aggregation improved the accuracy of the outputs in comparison to the observed data, especially during the stratified summer season. The results also indicated that phosphorus limitation of phytoplankton growth occurs in the upper layer during summer while light limitation occurs in the lower layer. In addition, physical processes such as diffusion and advection were also important as they ensured that most of regenerated nutrients in the lower layer were transported to the upper layer. Thus, these processes might support the high primary production and the production of oysters that are extensively cultured in this bay. Considering the informative results obtained, the model used in this study provides a sound basis and tool to describe the dynamics of phosphorus and nitrogen cyclings in Hiroshima Bay.  相似文献   

Reproductive success of Calanus pacificus during diatom blooms in Dabob Bay, Washington   总被引：1，自引：4，他引：1  

James J. Pierson  Claudia Halsband-Lenk  Andrew W. Leising 《Progress in Oceanography》2005,67(3-4):314

While numerous laboratory studies in the last decade have shown that diatoms can induce reproductive failure in copepods, field evidence for a negative diatom effect is equivocal. To unambiguously elucidate the effects diatoms have on copepod reproduction in situ, we undertook a study of the abundance, distribution, grazing rates, and reproductive success of Calanus pacificus in Dabob Bay, Washington, USA, during two spring bloom periods. We simultaneously measured the phytoplankton composition, abundance, and distribution. Here we present results for the reproductive success of C. pacificus using four measurements: egg production rate, clutch size, egg hatching success, and naupliar survival (to the first feeding stage). Egg production rate was positively correlated with chlorophyll a concentration, and egg hatching success and naupliar survival were usually greater than 80%. However, in February 2002 and 2003 – during blooms of diatoms of the genus Thalassiosira – either egg hatching success, naupliar survival, or both were significantly depressed compared to other times in spring and summer. These effects, combined with evidence that C. pacificus was grazing aldehyde-producing Thalassiosira at the time of their blooms, indicate that diatoms can negatively affect copepod reproduction in the field, albeit only under specific circumstances and for brief periods.  相似文献   

杭州湾跨海大桥桥位地形测绘中的潮位改正     

陈尚州  张奠梅 《海洋学研究》2002,20(4):30-34

在杭州湾跨海大桥桥位地形测绘中,采用三角分带解析法进行潮位改正计算,结果表明:合理布设潮位站、合理安排测量时间,可以提高地形测量精度,正确地进行潮位计算。一般应在高平潮前后3h时间内施测,可保证浅滩不出现测量空白区。地形测绘过程中还应布设不少于主测线数量的5%的检查线,以检查其测量精度。在所测的河口湾两岸潮位明显不等时,采用三角分带解析法进行潮位改正计算,其结果合理、正确,可达到规范的要求。  相似文献   

南极普里兹湾海域水文特征研究──夏季温、盐分布特征及底层水形成的探讨     

周培强  孙日彦 《中国海洋大学学报(自然科学版)》1995,(4)

分析普里兹湾及其附近海域温、盐分布特征，提出在艾默里冰架外侧有一片温暖水域。指出：１、变性极大的南极绕极深层水的前沿混合水可以影响到陆架上的南纬６７°左右；２、在两个“ＣＴＤ”探头直达海底的测站，深层观测到了温度为负值、盐度为３４．６７。据此，作者指出该水体属于南极底层水。此外，还对整个海区的跃层现象进行分类，计算了跃层的强度、厚度和深度。  相似文献   

Eiefsis Bay Anoxia: Nutrient Conditions and Benthic Community Structure     

Nikolaos  Friligos Argyro  Zenetos 《Marine Ecology》1988,9(4):273-290

Abstract. The changes in the concentrations of silicate, phosphate, and inorganic nitrogen in Eiefsis Bay. an intermittently anoxic basin, arc described and related to the changes in the physical properties of the water. Winter convection resulted in a very small vertical gradient of temperature, salinity, oxygen, and nutrients. Stratification started to develop in May and persisted for about 6 months. High values of silicate, phosphate, and ammonia occurred during the anoxic conditions prevailing in summer. The vertical transport of particulate organic matter and decomposition of abundant pelagic and benthic organic matter during the summer produced a low oxygen level in the bottom layer below the pycnoclinc. A high sea water temperature and vertical stability contributed to the development of anoxic conditions during the summer in the near bottom layer and to mass mortality of benthic macrofauna. Also the Eiefsis Bay anoxia appears to have had significant ecological effects on many other marine species, including several of economic importance.  相似文献