Dynamics and sources of dissolved organic carbon during phytoplankton bloom in hypereutrophic Lake Taihu (China)
Dynamics and sources of dissolved organic carbon during phytoplankton bloom in hypereutrophic Lake Taihu (China)
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富营养化太湖（中国）浮游植物水华期间溶解有机碳的动态和来源
DOI：
10.1016/j.limno.2015.05.003
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发表时间：
2015-09
期刊：
影响因子：
--
通讯作者：
Fanxiang Kong
中科院分区：
文献类型：
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作者：
Xiaodong Wu;Bo Liu;Dezhi Yan;Fanxiang Kong
为探讨浮游植物水华对太湖水体溶解有机碳（DOC）动态和来源的影响，沿着分析了太湖水体DOC和颗粒有机碳（POC）的浓度和稳定碳同位素（δ 13 C）值，以及水温、叶绿素a（Chla）浓度、浮游植物群落和细菌总丰度等环境因子。从2013年3月到8月，在太湖的五个地点。DOC浓度和δ 13 CDOC值在各采样点间存在显著差异。DOC在总有机碳（TOC）库中所占比例平均为30% ± 10%~ 81% ± 7%。POC与叶绿素浓度和蓝藻生物量均呈正相关，表明蓝藻水华对太湖POC库有贡献。8月份DOC相对于POC的13 C含量明显减少，表明8月份DOC部分来源于POC。但叶绿素a仅能解释整个太湖DOC变化的40%，在远离河口的两个站点，8月份外来碳的贡献不足50%。这些结果表明，外来源对DOC库的影响较大。此外，DOC的生物降解性进一步确定了总溶解碳水化合物DOC比（TCHO/DOC），比紫外吸收（SUVA 254），和生物可利用DOC的浓度（BDOC）。平均而言，17%的DOC的变化是由于BDOC池，BDOC浓度与叶绿素a，蓝藻生物量，和总细菌丰度呈正相关，这表明蓝藻衍生的DOC是可生物降解的，并优先利用细菌。
To establish the influence of phytoplankton blooms on the dynamics and sources of dissolved organic carbon (DOC) in Lake Taihu, the concentrations and stable carbon isotope values (δ13C) of DOC and particulate organic carbon (POC) were analyzed, along with environmental factors, including water temperature, chlorophylla(Chla) concentration, phytoplankton community and total bacterial abundance, from March to August 2013 at five sites in Lake Taihu. Significant differences were observed in the DOC concentrations and δ13CDOCvalues at the sampling sites. On average, the proportion of DOC in the total organic carbon (TOC) pool ranged from 30% ± 10% to 81% ± 7%. POC was positively associated with both Chlaconcentration and cyanobacteria biomass, suggesting that cyanobacteria blooms contribute to the POC pool in Lake Taihu. Depleted13C in DOC relative to POC was observed in August, indicating that DOC was partially derived from POC in August. However, Chlaexplained only 40% of the variation in DOC in the entirety of Lake Taihu, and at two sites far from the estuary, the contribution of allochthonous carbon was less than 50% in August. These results suggested a greater influence of allochthonous sources on the DOC pool. Moreover, the biodegradability of DOC was further determined by the total dissolved carbohydrates to DOC ratio (TCHO/DOC), specific UV absorbance (SUVA254), and the concentrations of bioavailable DOC (BDOC). On average, 17% of the variation in DOC was attributable to the BDOC pool, and the BDOC concentration correlated positively with Chla, cyanobacteria biomass, and total bacterial abundance, suggesting that cyanobacteria–derived DOC is biodegradable and is preferentially utilized by bacteria.
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DOI：
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发表时间：
2007-06
期刊：
Coastal marine science
影响因子：
--
作者：
H. Fukuda;H. Ogawa;R. Sohrin;A. Yamasaki;I. Koike
通讯作者：
H. Fukuda;H. Ogawa;R. Sohrin;A. Yamasaki;I. Koike
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影响因子：
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F. Nara;A. Imai;M. Yoneda;K. Matsushige;Kazuhiro Komatsu;T. Nagai;Y. Shibata;Takahiro Watanabe
DOI：
10.4025/actascibiolsci.v35i1.11054
发表时间：
2013-12
期刊：
Acta Scientiarum. Biological Sciences
影响因子：
--
作者：
M. C. Teixeira;J. C. D. Azevedo;T. A. Pagioro
通讯作者：
M. C. Teixeira;J. C. D. Azevedo;T. A. Pagioro
影响因子：
6.6
作者：
Jun Xu;Min Zhang;P. Xie
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Jun Xu;Min Zhang;P. Xie