不同浓度藻类水华对两种沉水植物的影响

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Abstract

In order to examine the effects of the amount of algal blooms on the restoration of submerged vegetations, we carried out the simulated experiments to study the growth and physiological responses of Potamogeton pectinatus and Elodea nuttallii to different concentrations (0, 6.25×10⁸, 2.5×10⁹, 10¹⁰cell/L) of algal blooms. The results showed that the dry weight of E. nuttallii at the low concentration (6.25×10⁸cell/L) of algal blooms was less than that of the control group, whereas the dry weight of P. pectinatus was not less than that of control group until the concentration of algal blooms reaches 10¹⁰cell/L. Compared with other treatments, the height of P. pectinatus was the shortest, while the height of E. nuttallii was the highest at the high concentration (10¹⁰cell/L) of algal blooms. It was showed that the photosynthetic activity of P. pectinatus decreased from 0.77 to 0.50 at the high concentration (10¹⁰cell/L) of algal blooms. However, the change of photosynthetic activity of E. nuttallii was not significant, ranging from 0.72 to 0.79. The antioxidant enzymes activity of submerged macrophytes decreased with increasing amount of algal blooms. These studies suggest that the effect of algal blooms on the growth of aquatic plants is dose-dependent. Although submerged plants can tolerate short-term stress of low concentrations of algal blooms, the high concentrations of algal blooms affect the resistance physiology of submerged macrophytes. The high concentrations of algal blooms greatly affect the growth of submerged plants over a long time, thereby affecting the restoration of submerged vegetations.

Key words： algal blooms submerged macrophytes growth

Received: 08 January 2016

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	Articles by authors
	DAI Liang-liang
	GUO Liang-liang
	WU Zhong-kui
	ZHOU Wei-cheng
	LI Gen-bao

Cite this article:

DAI Liang-liang,GUO Liang-liang,WU Zhong-kui等. The effects of different concentrations of algal blooms on the two submerged macrophytes[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(9): 2765-2773.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2016/V36/I9/2765

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