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三峡水库一条支流中悬浮颗粒物对浮游植物密度影响的新见解。

New insights into the impacts of suspended particulate matter on phytoplankton density in a tributary of the Three Gorges Reservoir, China.

作者信息

He Qiang, Qiu Yixi, Liu Haohang, Sun Xingfu, Kang Li, Cao Li, Li Hong, Ai Hainan

机构信息

Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing, 400044, China.

Xiamen Municipal Engineering Design Institute CO., LTD, Chongqing, 401122, China.

出版信息

Sci Rep. 2017 Oct 18;7(1):13518. doi: 10.1038/s41598-017-13235-0.

DOI:10.1038/s41598-017-13235-0
PMID:29044136
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5647362/
Abstract

Phytoplankton density can be influenced by a wide range of factors whereas the role of suspended particulate matter (SPM) are not clear in river that annually subjected to hydrodynamics shift. Here, spatial-temporal variation of environmental parameters and phytoplankton density were studied from January 2013 to December 2014 in Yulin River, a tributary of the Three Gorges Reservoir, China. Laboratory experiments were conducted to elucidate the key parameter and interpret how it impacted phytoplankton density. SPM is negatively correlated with phytoplankton density. Despite SPM in Yulin River revealed weaker NH-N, NO-N and PO-P adsorption capabilities in comparison to that in other aquatic ecosystems, increase of water velocity from 0.1 to 0.8 m/s led to approximately 6.8-times increase of light attenuation rate. In experiments evaluating the aggregation of Chlorella pyrenoidosa upon SPM, floc size showed 7.4 to 22% fold increase compared to the SPM or algae itself, which was due to the interaction between SPM and phytoplankton extracellular polymeric substances. Our results suggest that SPM could contribute to the variation of phytoplankton density through the integrated process including light attenuation, nutrient adsorption and algae aggregation. This is the first evaluation of the multiple processes underlying the impact of SPM on phytoplankton.

摘要

浮游植物密度会受到多种因素的影响，而在每年经历水动力变化的河流中，悬浮颗粒物（SPM）的作用尚不清楚。在此，于2013年1月至2014年12月对中国三峡水库支流玉林河的环境参数和浮游植物密度的时空变化进行了研究。开展了实验室实验以阐明关键参数，并解释其如何影响浮游植物密度。SPM与浮游植物密度呈负相关。尽管玉林河中的SPM相较于其他水生生态系统显示出较弱的氨氮、硝态氮和磷酸磷吸附能力，但水流速度从0.1米/秒增加到0.8米/秒导致光衰减率增加了约6.8倍。在评估小球藻在SPM上聚集的实验中，絮凝体大小相较于SPM或藻类本身增加了7.4%至22%，这是由于SPM与浮游植物胞外聚合物之间的相互作用所致。我们的结果表明，SPM可通过包括光衰减、养分吸附和藻类聚集在内的综合过程导致浮游植物密度变化。这是对SPM影响浮游植物的多个潜在过程的首次评估。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/9dfdff2b8a50/41598_2017_13235_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/a821e1e3c447/41598_2017_13235_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/32e33aa61cd3/41598_2017_13235_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/df7b31dbeab0/41598_2017_13235_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/d59ade65d761/41598_2017_13235_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/bf44e1d7ca5a/41598_2017_13235_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/40324130af9c/41598_2017_13235_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/33844c2b7b96/41598_2017_13235_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/9dfdff2b8a50/41598_2017_13235_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/a821e1e3c447/41598_2017_13235_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/32e33aa61cd3/41598_2017_13235_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/df7b31dbeab0/41598_2017_13235_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/d59ade65d761/41598_2017_13235_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/bf44e1d7ca5a/41598_2017_13235_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/40324130af9c/41598_2017_13235_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/33844c2b7b96/41598_2017_13235_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a93/5647362/9dfdff2b8a50/41598_2017_13235_Fig8_HTML.jpg

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