基于AMBI和M-AMBI指数的黄河口及邻近海域底栖生境质量评价   总被引：4，自引：3，他引：1  

罗先香  张娟  杨建强  宋文鹏  崔文林 《海洋学报(英文版)》2014,33(9):117-124

The protection of the biological diversity and the maintenance of the regional ecological integrity for the Huanghe （Yellow River） Estuary and its adjacent areas are practically significant and valuable. However, frequent human activities and natural climate changes have caused vigorous disturbances on the ecosystem in these sea areas. An objective assessment on the benthic habitat quality （BHQ） of the Huanghe Estuary and its adjacent areas is conducted, using AZTI＇s Marine Biotic Index （AMBI） and multivariate AMBI （M-AMBI） based on the data of macrobenthos in May and August 2011. The results show that both the indices do not correlate significantly, and their assessment results are greatly different. All of the samples assessed using the AMBI were ＂high＂ or ＂good＂, because the ecological group I （EGI） and the ecological group II （EGII） were dominant macrobenthic ecological groups in the research area. Owing to a low species＇ richness and a high individual abundance in some samples, the BHQ levels using the M-AMBI were worse than those of the AMBI. Significant correlations are observed between the M-AMBI, water depth, bottom water salinity and dissolved inorganic nitrogen, thus the M-AMBI could sensitively respond to environmental changes and distinguish influences from uninfluenced stations, but the AMBI could not. The consistent results between the AMBI and the M-AMBI mainly appeared in the uninfluenced （undisturbed or slightly disturbed） sta- tions. Therefore, the M-AMBI is more effective than the AMBI in assessing the benthic habitat quality in the Huanghe Estuary and its adjacent areas. Using the M-AMBI to assess the BHQ of the Huanghe Estuary and its adjacent areas, the results show that 3% of the stations are undisturbed and the BHQs are ＂high＂, and 61% of the stations are slightly disturbed and those of the BHQ are ＂good＂, and the rest are meanly disturbed and those of the BHQ are ＂moderate＂.  相似文献   

Stratigraphic signatures of punctuated rise in relative sea-level in an estuary-dominated heterolithic succession: Incised valley fills of the Toarcian Ostreaelv Formation,Neill Klinter Group (Jameson Land,East Greenland)     

《Marine and Petroleum Geology》2014

The Ostreaelv Formation (latest Pliensbachian–Toarcian) of the Neill Klinter Group is exposed along a >105 km wide, ENE-trending section in Jameson Land, East Greenland. Deposition took place in a large embayment (Jameson Land Basin) that was connected to the proto-Norwegian-Greenland Sea. Lithofacies in the Ostreaelv Formation range from clean sandstone to muddy heterolithic facies typified by strong grain-size contrasts.The Ostreaelv Formation is divided into four distinct and overall retrograding allostratigraphic units each composed of a characteristic set of tide-influenced, tide-dominated and wave-influenced facies associations. The allostratigraphic units are bounded by subaerial unconformities, interpreted as sequence boundaries, and are up to 75 m thick and 16 to >20 km in width. The allostratigraphic units include a sandy heterolithic estuary bay-head delta succession overlain by two sandy tide-dominated estuary fill successions, interbedded with a muddy heterolithic offshore marine succession. Each of the three estuarine allostratigraphic units was accumulated in an incised valley formed during fall in relative sea level and filled during successive transgressions with sediment supplied from marine and reworked fluvial deposits.In the three incised valleys fluvial sediments were deposited on top of an initial subaerial unconformity surface (SU) and were later reworked by succeeding transgressive ravinement along a transgressive surface (TS), thus creating combined SU/TS sequence boundaries. The data from the Ostreaelv Formation also provides knowledge and conceptual understanding of valley infill processes (tidal current, wave and fluvial energy), and both lateral and vertical variations in lithofacies architecture within incised valleys.Moreover, the study provides quantitative input data, such as incised valley dimensions, sand-containing capacity, and geometry to subsurface reservoir characterisation and modelling efforts of estuary fill successions.  相似文献   

珠江河口磨刀门水道枯季盐水入侵特性分析   总被引：1，自引：0，他引：1  

方神光 《海洋科学》2014,38(11):90-99

为探讨磨刀门水道潮流和盐度的三维分布特性,本文建立了磨刀门水道的三维潮流和盐度数值模型,采用2009年枯季磨刀门水道实测潮流和盐度资料对模型参数进行率定和验证。结果显示,枯季由于上游径流量小,磨刀门水道总体涨、落潮流速都不大,表层总体涨潮平均流速都在0.5 m/s以内,总体落潮平均流速在0.8 m/s以内;底层总体涨落潮平均流速都在0.5 m/s以内;从盐度的平面分布来看,磨刀门水道近口门河段总体呈现涨潮时水道东侧盐度高于西侧,落潮时东侧盐度小于西侧的趋势。大潮和中潮期间,落潮时盐水向上游的入侵距离反而较涨潮时更远,主要原因是,落潮时的底层盐水向上游的补偿流动以及地形阻拦形成更为强烈的紊动扩散。潮汐动力弱(小潮)时,整个水道内水流流速很小,流态平缓,紊动较弱,总体仍呈现涨潮时入侵距离大于落潮,显示枯季磨刀门水道盐水入侵的主要影响因素取决于地形和潮动力。  相似文献   

泉州湾洛阳江口2种红树林生境大型底栖动物群落多样性比较     

郭涛  ;蔡立哲  ;卓异  ;饶义勇  ;李想  ;陈昕餠  ;傅素晶  ;纪剑锋 《台湾海峡》2014,(2):204-211

为探讨泉州湾洛阳江口桐花树和秋茄2种红树林生境的大型底栖动物群落是否存在明显差异,于2011年4月至2012年1月对2种红树林生境的大型底栖动物进行了季度定量调查.结果表明：4个季度在2种红树林生境定量取样获得大型底栖动物49种,其中多毛类15种,腹足类8种,甲壳类15种,鱼类3种,昆虫2种,刺胞动物、扁形动物、纽形动物、星虫动物、寡毛类和双壳类各1种.寡鳃齿吻沙蚕（Nephtys oligobranchia）、短拟沼螺（Assiminea brevicula）、弧边招潮蟹（Uca arcuata）、指海葵（Actinia sp.）等在2种生境均有较高的栖息密度,可口革囊星虫（Phascolosoma esculenta）是2种生境的常见种,但栖息密度不高.虽然秋茄生境的大型底栖动物平均生物量高于桐花树生境,但桐花树生境的大型底栖动物群落的物种数、栖息密度、多样性指数（H’）、均匀度指数（J）和丰富度指数（d）均高于秋茄生境.单变量双因素方差分析（Two-way ANOVA）表明,2种红树林生境的大型底栖动物群落的多样性指数和均匀度指数有显著的季节差异、生境差异以及生境×季节差异.聚类分析表明,2种红树林生境的大型底栖动物群落组成的相似性较高,其原因是它们所处的潮区相同、沉积物类型相似和底质粒径相近.  相似文献   

泉州湾河口湿地红树林区鸟类组成和年变动研究     

陈若海 《湿地科学与管理》2014,(4):61-63

2011年10月至2012年9月对泉州湾河口湿地红树林区鸟类多样性进行了调查,共记录到79种鸟类,隶属12目27科。其中,冬候鸟40种、留鸟31种和夏候鸟8种。红树林区古北界鸟类41种,东洋界鸟类35种,广布种3种。分析了泉州湾河口湿地红树林区鸟类分布和年变动情况,比较了福建省6个红树林区湿地鸟类季节型的组成,指出泉州湾河口湿地红树林鸟类保护存在的问题,并提出了保护建议。  相似文献   

Distributions of picophytoplankton and phytoplankton pigments along a salinity gradient in the Changjiang River Estuary,China     

Baoli Wang  Congqiang Liu  Fushun Wang  Siliang Li  Sivaji Patra 《中国海洋大学学报(英文版)》2014,13(4):621-627

We investigated the abundance of different picophytoplankton groups and the phytoplankton pigment ratio in relation to environmental factors such as nutrients and suspended solids along a salinity gradient in the Changjiang River Estuary. The average numbers of Synechococcus spp.(Syn) and picoeukaryotes(Euk) were(2.7 ±5.1) ×103 and(1.1±1.4) ×103 cells m L-1, respectively. Prochlorococcus spp.(Pro) was only found in the high-salinity brackish water with the concentration of 3.0×103 cells m L-1. Syn and Euk numbers both tended to increase offshore and Syn showed a larger variation in cell abundance than Euk. The contribution of picophytoplankton to total phytoplankton biomass increased with increasing salinity and decreasing nutrient concentrations from the estuary to the open ocean. The response of different picophytoplankton groups to environmental variables was different. Water temperature was more important in its control over Euk than over Syn, while nutrients were more important in their influence over Syn than over Euk. Phytoplankton pigment ratios were different in the three different ecological zones along the salinity gradient(i.e., freshwater zone with 0-5 range, fresh and saline water mixing zone with 5-20 range, and high-salinity brackish water zone with 20-32 range), where three different phytoplankton communities were discovered, suggesting that phytoplankton pigment ratios can be considered as a complementary indicator of phytoplankton community structure in the Changjiang River Estuary.  相似文献   

Modelling the influence of currents on wave propagation at the entrance of the Tagus estuary   总被引：1，自引：0，他引：1  

L. Rusu 《Ocean Engineering》2011,38(10):1174-1183

A study of the wave propagation and of the consequences of the influence of currents on waves in the Tagus estuary is performed in the present work. For this purpose a high-resolution SWAN domain was coupled to a wave prediction system based on the two state of the art phase averaged wave models, WAM for wave generation and SWAN for nearshore wave transformation. The most important factors affecting the incoming waves are the local currents and the wind. These influences were evaluated by performing SWAN simulations in the target area with and respectively without considering the tide level and tide induced currents. The model results were compared with wave measurements, validating in this way the results of the wave prediction system developed herewith.  相似文献   

辽河口沉积物反硝化细菌数量及多样性的研究   总被引：5，自引：0，他引：5  

樊景凤  陈佳莹  陈立广  关道明 《海洋学报》2011,33(3):94-102

对辽河口沉积物中反硝化细菌的数量、多样性以及群落结构进行了研究.采用MPN-Griess分析了春夏秋三季的反硝化细菌数量,结果表明其数量春季最多,秋季次之,夏季最低,且从辽河下游及河口向远海区域逐渐降低.采用PCR-RFLP对反硝化细菌的亚硝酸盐还原酶基因(nirS)进行分析,发现沉积物中的反硝化细菌类型较新,大多数细...  相似文献   

Estimation of turbulent kinetic energy dissipation rate in the bottom boundary layer of the Pearl River Estuary     

刘欢  吴超羽  任杰 《中国海洋工程》2011,25(4):669-678

A structure function approach is applied to estimate the turbulent kinetic energy(TKE) dissipation rate in the bottom boundary layer of the Pearl River Estuary(PRE).Simultaneous measurements with an acoustic Doppler velocimeter(ADV) supplied independent data for the verification of the structure function method.The results show that,1) the structure function approach is reliable and successfully applied method to estimate the TKE dissipation rate.The observed dissipation rates range between 8.3×10 4 W/kg and 4.9×10 6 W/kg in YM01 and between 3.4×10 4 W/kg and 4.8×10 7 W/kg in YM03,respectively,while exhibiting a strong quarter-diurnal variation.2) The balance between the shear production and viscous dissipation is better achieved in the straight river.This first-order balance is significantly broken in the estuary by non-shear production/dissipation due to wave-induced fluctuations.  相似文献   

春季长江口及毗邻海域浮游动物空间分布及与环境因子的关系   总被引：4，自引：0，他引：4       下载免费PDF全文

朱延忠  刘录三  郑丙辉  王瑜 《海洋科学》2011,35(1):59-65

于2009年4月15～23日在长江口及其邻近海域进行了32个站位的浮游动物生态调查,分析了浮游动物的种类组成、优势种、丰度和生物量的空间分布,并利用PRIMER生物统计学软件中的PCA、BIOENV和RELATE程序分析了浮游动物与环境因子的关系.共发现浮游动物成体72种,浮游幼虫9种,合计种类数为81.中华哲水蚤(C...  相似文献