Mechanisms controlling the carbon stable isotope composition of phytoplankton in karst reservoirs

	Mechanisms controlling the carbon stable isotope composition of phytoplankton in karst reservoirs
	Wang Baoli; Liu Cong-Qiang; Peng Xi; Wang Fushun
	2013
发表期刊	Journal of Limnology
卷号	72 期号:1 页码:127-139
摘要	In order to systematically understand the mechanisms controlling the carbon stable isotope composition of phytoplankton (delta C-13(PHY)) in freshwater ecosystems, seasonal changes in delta C-13(PHY) and related environmental factors were determined in karst reservoirs from the Wujiang river basin, China. Substantial and systematic differences within seasons and reservoirs were observed for delta C-13(PHY), which ranged from -39.2 parts per thousand to -15.1 parts per thousand. An increase in water temperature triggered fast growth of phytoplankton which assimilated more dissolved inorganic carbon (DIC), resulting in the increase of delta C-13(PHY), delta C-13(DIC) and pH. When the concentration of dissolved carbon dioxide (CO2) was less than 10 mu mol L-1, phytoplankton shifted to using HCO3- as a carbon source. This resulted in the sharp increase of delta C-13(PHY). The carbon stable isotope composition of phytoplankton tended to decrease with the increase of Bacillariophyta, which dominated in January and April, but tended to increase with the increase of Chlorophyta and Dinophyta, which dominated in July. Multiple regression equations suggested that the influence of biological factors such as taxonomic difference on delta C-13(PHY) could be equal or more important than that of physical and chemical factors. Thus, the effect of taxonomic differences on delta C-13(PHY) must be considered when explaining the delta C-13 of organic matter in lacustrine ecosystem.
关键词	Δ13c Temperature Taxonomic Difference Phytoplankton Karst Reservoir
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5025
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Wang Baoli,Liu Cong-Qiang,Peng Xi,et al. Mechanisms controlling the carbon stable isotope composition of phytoplankton in karst reservoirs[J]. Journal of Limnology,2013,72(1):127-139.
APA	Wang Baoli,Liu Cong-Qiang,Peng Xi,&Wang Fushun.(2013).Mechanisms controlling the carbon stable isotope composition of phytoplankton in karst reservoirs.Journal of Limnology,72(1),127-139.
MLA	Wang Baoli,et al."Mechanisms controlling the carbon stable isotope composition of phytoplankton in karst reservoirs".Journal of Limnology 72.1(2013):127-139.

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