Characteristics of Phytoplankton Biomass, Primary Production and Community Structure in the Modaomen Channel, Pearl River Estuary, with Special Reference to the Influence of Saltwater Intrusion during Neap and Spring Tides.
Characteristics of Phytoplankton Biomass, Primary Production and Community Structure in the Modaomen Channel, Pearl River Estuary, with Special Reference to the Influence of Saltwater Intrusion during Neap and Spring Tides.
复制标题
珠江口磨刀门航道浮游植物生物量、初级生产力和群落结构特征及其小潮和大潮咸水入侵的影响
DOI：
10.1371/journal.pone.0167630
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Long A
中科院分区：
文献类型：
--
作者：
Zhou W;Gao J;Liao J;Shi R;Li T;Guo Y;Long A
近几十年来，磨刀门海峡咸水入侵的频率和强度不断增加，威胁着珠江口周边城市的淡水供应，进一步改变了河口水域的环境条件。在2011年9月下旬发生强咸水入侵事件的小潮和大潮期间，对磨刀门海峡下游断面的浮游植物生物量、初级生产力(PP)、物种组成以及水文和化学参数进行了研究。共鉴定浮游植物46种，其中硅藻25种，甲藻14种，绿藻4种，蓝藻2种，裸藻1种。优势种由淡水硅藻(如粒直链藻和颗粒直链藻var)转移而来。Angustissima)到咸水硅藻(如中肋骨条藻和Coscinodisus sp.)在河口。一般情况下，浮游植物密度、生物量(Chl-a)和PP沿航道从上游向下游递减，且NT显著高于ST。上游由大型浮游植物(>；20μm)向下游相对较小的浮游植物(5~20μm)转移。与NT相比，ST期间较低的流量和流速，加上较强的东风，特别是在上游(距河口约50公里)加剧了咸水入侵。海水的入侵稀释了营养盐、N/P比、Chl-a和浮游植物的丰度，从而导致了ST期间PP的下降。
In recent decades, increasing frequency and intensity of saltwater intrusion in the Modaomen Channel has threatened the freshwater supply in the surrounding cities of the Pearl River Estuary, and ulteriorly changed the environmental conditions of the estuarine waters. Phytoplankton biomass, primary production (PP) and species composition, as well as hydrological and chemical parameters were examined along a downstream transect in the Modaomen Channel during neap tide (NT) and spring tide (ST), when a strong saltwater intrusion event occurred in late September, 2011. A total of 46 species phytoplankton were identified, including Bacillariophyta (25 species), Dinoflagellate (14 species), Chlorophyta (4 species), Cyanophyta (2 species) and Euglenozoa (1 species). The dominant species were shifted from freshwater diatoms (e.g., Melosira granulata and Melosira granulata var. angustissima) in the upper reaches to saline water diatoms (e.g., Skeletonema costatum and Coscinodiscus sp.) in the river mouth. Generally, phytoplankton density, biomass (chl-a) and PP decreased from the upper to lower reaches along the channel, and were significantly higher in NT than those of ST. There was a shift from large-sized phytoplankton (>20 μm) in the upper reaches to relative small-sized cells (5–20 μm) in the lower reaches. Compared to NT, low discharge and flow velocity, coupled with strong easterly winds during ST specially aggravated saltwater intrusion further to the upstream (~50 km from the estuary). The intruded saltwater diluted nutrients, N/P ratios, chl-a, and phytoplankton abundances, and thereby led to a decline in PP during ST.
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影响因子：
2.8
作者：
JUSTIC, D;RABALAIS, NN;DORTCH, Q
通讯作者：
DORTCH, Q
影响因子：
5
作者：
Paerl, Hans W.;Valdes-Weaver, Lexia M.;Winkelmann, Valerie
通讯作者：
Winkelmann, Valerie
南海珠江口高度富营养化及其附近浮游植物动态
影响因子：
2.3
作者：
Qiu, Dajun;Huang, Liangmin;Lin, Senjie
通讯作者：
Lin, Senjie
影响因子：
2
作者：
PIELOU, EC
通讯作者：
PIELOU, EC
DOI：
10.1007/bf02209352
发表时间：
1980-01-01
期刊：
Journal of the Oceanographical Society of Japan
影响因子：
--
作者：
SEKI H;EBARA A
通讯作者：
EBARA A