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首页> 外文期刊>Estuarine Coastal and Shelf Science >Evaluation on phytoplankton communities fluctuations in a natural gas hydrate deposit of Northern South China Sea
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Evaluation on phytoplankton communities fluctuations in a natural gas hydrate deposit of Northern South China Sea

机译：浮游植物北部南海天然气水合物矿床的评价

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The gas hydrate deposit in Shenhu, Northern South China Sea (NSCS) was one of the main sources for deep-water hydrocarbon and hydrate. Based on field observations on a gas hydrate deposit among 20 x 20 km(2) at Shenhu of the northern continental slope of SCS in May (before drilling) and September (after drilling) in 2015, environmental baseline, comparisons of phytoplankton community, biomass and potential environmental drivers were studied. Results indicated the deposit area was a typical low-nutrients low-chlorophyll a (LNLC) environment, characterized by low phytoplankton abundance and diversity. The maximum of abundance and Chl a were fixed at 75 m before and after drilling, but their decrease was larger from 0.53 mg/m(3) to 0.40 mg/m(3) and 1218 cells/L to 843 cells/L with non-significance found, respectively. After drilling, ammonium decreased significantly (2.13 mu mol/L to 0.20 mu mol/L), along with nitrite, salinity and dissolved methane, while pH increased significantly (8.10-8.19). Phytoplankton community was composed of 97 taxa of 47 genera in 4 classes, including diatoms, dinoflagellates, cyanobacteria and chrysophyte. The dominant diatom species before and after drilling remained the same, which included Navicula parva, Pseudonitzchia circumpora and Fragilariopsis doliolus. Dominant dinoflagellates shifted from the cosmopolitan Scrippsiella trochoidea to the warm-water adapted Gyrodinium flavum. The diazotrophic cyanobacterium Trichodesmium thiebaultii become more apparent in higher occurrence and abundance due to alleviation from lower-pH inhibition on nitrogen fixation. Redundancy analysis and Spearman correlation analysis revealed that the dominant species and Chl a were mainly associated to pH, DO and nitrite. The X-bar control chart indicated that a constrained maximum problem of phytoplankton abundance in particular layers (50 m, 75 m and 100 m). We clearly documented in the revisited stations (SH3-W2 and SH3-W14), the decrease of abundance and Chl a and the increase of pH and DO were evident in each sampling layer accompanied with lower dissolved methane associated to in situ anoxic or aerobic microniches activities, but the correlations with dissolved methane were not strong.
机译：南海北海（NSCS）中湖水的天然气水合物矿床是深水碳氢化合物和水合物的主要来源之一。基于现场观察2015年5月（钻井前）和9月（钻井前）的南部南部南部南部南部南湖的天然气水合矿床（2）），环境基线，浮游植物群落的比较，生物量并研究了潜在的环境司机。结果表明，沉积物面积是典型的低营养物低叶绿素A（LNLC）环境，其特征在于浮游植物低丰度和多样性。在钻孔之前和之后，最大丰度和CHL A固定在75米，但它们的减少从0.53mg / m（3）至0.40mg / m（3）和1218个细胞/ L至843个细胞/ L以非 - 分别发现了。钻孔后，铵显着降低（2.13μmol/ L至0.20μmmol/ l），以及亚硝酸盐，盐度和溶解的甲烷，而pH值显着增加（8.10-8.19）。 Phytoplankton群落由4级的47个属的97个分类群组成，包括硅藻，丁络石，蓝藻和菊芋。钻井前后的主要硅藻物种仍然是相同的，其中包括Navicula Parva，Pseudonitzchia Circumpora和Fragilariopsis Doliolus。占优势的Dinoflagellates从Cosmopolitan Scrippsiella Trochoinea转移到温水适应的吡哆ul Flavum。由于较低pH抑制对氮固定的抑制，重氮脱节性的蓝杆菌乳突术术中急剧和丰度变得更加明显。冗余分析和Spearman相关性分析显示，显性物种和CHL A主要与pH，何种和亚硝酸盐相关。 X杆控制图表表明，特别是植物浮游植物的最大值问题（50米，75米和100μm）。我们清楚地记录在重新致密的站（SH3-W2和SH3-W14）中，在每个采样层中，在伴随于原位缺氧或有氧微米素相关的较低溶解的甲烷中，在每次采样层中显而易见的富度和CHL A和pH的增加和pH的增加活动，但与溶解甲烷的相关性并不强烈。

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