蓝藻胁迫条件下不同基质类型对苦草和伊乐藻生长的影响

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Abstract

In order to investigate the relationships between the growth of submerged macrophytes and the nutrients condition of their substrates under cyanobacterial stress conditions, mesocosms were constructed to study the effects of two different substrates (the yellow clay with relative poor nutrient and the black sediment with rich nutrient) on the growth of two submersed aquatic macrophytes, i.e. Vallisneria natans and Elodea canadensis after adding the same biomass of fresh cyanobacteria to each mesocosm. The results showed that the biomass of V. natans in the yellow clay was higher than that in black sediment as compared to E. Canadensis. Meanwhile, the maximum leaf length and the number of the new ramets were higher in the yellow clay, and the maximum root length was significantly longer in the yellow clay than that in the black sediment. As for the E. Canadensis, there was no significant difference in biomass between the two substrates, but the length, the number and the dry biomass of the new branches of E. Canadensis were larger in the yellow clay. All those results suggest that under cyanobacterial stress conditions, the substrates with the high nutrition level is not favorable to the growth of submerged macrophytes; moreover, their effects on the rooted submerged macrophyte V. natans were larger than those on the rhizoid submerged macrophyte E. Canadensis.

Key words： cyanobacteria accumulation substrates type submerged macrophytes Vallisneria spinulosa Elodea canadensis

Received: 25 June 2013

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	Articles by authors
	WANG Xu
	CHEN Xin-fang
	GUAN Bao-hua
	LIU Zheng-wen

Cite this article:

WANG Xu,CHEN Xin-fang,GUAN Bao-hua, et al. Effects of substrate on Vallisneria natans and Elodea canadensis under cyanobacterial stress conditions[J]. , 2013, 32(3): 303-307.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2013/V32/I3/303

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