悬浮泥沙对蓝藻光合及细胞化学计量的影响

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Abstract

Microcystisflos-aquae, a dominant species of cyanobacteria in eutrophic waters was selected and cultivated in lab-scale batch experimentto investigate intracellular resourceallocation and stoichiometryunder different levels of suspended sediments. With the increase of suspended sediments, it was observed that the growth rate of M. flos-aquae and cholorophyll a (chla) significantly decreased. Simultaneous decreases of photosynthetic activity, maximum photosynthetic oxygen evolution rateand saturating irradiance, together with the increases of respiration rates and inhabitation effect of light irradiance were apparent. In addition, there was slight increases in cellular N of M. flos-aquae with increasing concentration of sediments, whereas C and P accumulation demonstrated the opposite trends. These resulted in the increases of intracellular N/P and C/P with the increase of suspended sediments. The ratio of C/chla decreased with the increase of suspended sediments. These evidencessupported that although suspended sediment produced light attenuation in the culture,and reducedthe intracellular C content and energy supply,M. flos-aquae preferentially replenished C, increased N synthesis and saved the energy consumption of P synthesis by adjusting its own eco-physiological functions and metabolic strategies. The fact that the optimum cellular stoichiometry of M. flos-aquae in response to suspended sediments presented a good example to understand the adaptive strategies of M. flos-aquae in field.

Key words： light attenuation Microcystis flos-aquae P-I curve resource allocation suspended sediments

Received: 06 July 2018

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X172

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	Articles by authors
	LIU Ling-xin
	ZHANG Lei
	XIAO Yan
	LI Zhe

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LIU Ling-xin,ZHANG Lei,XIAO Yan等. Effects of suspended sediments on photosynthetic and stoichiometrictraits of cyanobacteria[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(2): 778-784.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I2/778

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