Relationship between nutrients and plankton biomass in the turbidity maximum zone of the Pearl River Estuary.
Relationship between nutrients and plankton biomass in the turbidity maximum zone of the Pearl River Estuary.
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DOI：
10.1016/j.jes.2016.11.013
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发表时间：
2017-07
影响因子：
6.9
通讯作者：
Zhen Shi;Jie Xu;Xiaoping Huang;Xia Zhang;Zhijian Jiang;F. Ye;Ximei Liang
中科院分区：
文献类型：
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作者：
Zhen Shi;Jie Xu;Xiaoping Huang;Xia Zhang;Zhijian Jiang;F. Ye;Ximei Liang
比较了珠江口最大浑浊带（TMZ）和邻区（非TMZ）的营养物、溶解有机碳和颗粒有机碳以及浮游生物（细菌、植物和动物）的含量。结果表明，高水平的悬浮物对TMZ内营养物和浮游生物的动态有显著影响。根据总悬浮物（TSS）浓度聚类分析，将所有站点分为TMZ和非TMZ两组，TMZ平均TSS为171 mg/L和45 mg/L。悬浮物吸附PO43−和溶解有机碳，导致TMZ中颗粒磷和有机碳（POC）含量高于非TMZ， PO43−和DOC含量较低。而悬浮物对含氮养分的影响有限。浮游植物的生长受高浓度悬浮物的限制，而浮游植物的丰度高峰出现在非浮游植物区。相比之下，细菌丰度最高的是TMZ，这可能是低DOC水平的部分原因。珠江口TMZ区和非TMZ区浮游动物丰度的两个高峰分别以细菌和浮游植物为主要支撑。我们的发现表明，高水平的悬浮固体在TMZ影响营养平衡。
Nutrients, dissolved and particulate organic carbon and plankton (bacterio-, phyto- and zoo-) were compared in the turbidity maximum zone (TMZ) and adjacent areas (non-TMZ) in the Pearl River estuary. Our results showed that high levels of suspended substances had marked effect on dynamics of nutrients and plankton in the TMZ. Based on the cluster analysis of total suspended solids (TSS) concentrations, all stations were divided into two groups, TMZ with average TSS of 171 mg/L and non-TMZ of 45 mg/L. Suspended substances adsorbed PO43 −and dissolved organic carbon, resulting in higher particulate phosphorus and organic carbon (POC) and lower PO43 −and DOC in the TMZ, compared to the non-TMZ. However, suspended substances had limited effect on nitrogenous nutrients. Phytoplankton growth was light-limited due to high concentrations of suspended substances in the TMZ and a peak of phytoplankton abundance appeared in the non-TMZ. In contrast, the highest bacterial abundance occurred in the TMZ, which was likely partly responsible for low DOC levels. Two peaks of zooplankton abundance observed in the TMZ and non-TMZ in the Pearl River estuary were primarily supported by bacteria and phytoplankton, respectively. Our finding implied that high levels of suspended solids in the TMZ affect the trophic balance.