稻草秸秆发酵液的抑藻效应及其机理

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Abstract In order to use agricultural waste rice straws to inhibit algae growth more efficiently, this study experimented specific fermentation of different rice straws, measured the allelopathy performance of the fermentation liquids on common freshwater algae, and discussed the mechanism of fermentation liquid with strong algae inhibition. The results showed that compared with ordinary rice straw fermentation liquids, the fermentation liquid with rice tillering branch had significantly better inhibitory effect on Microcystis aeruginosa (P<0.05), and the inhibition rate after 72h treatment was 93.21%, then increased to 97.96% at 168h. With the treatment of the ordinary rice straw fermentation liquid, the corresponding inhibition rate at 120h was only 68.20%, then decreased significantly to only 27.65% at 168h. The Eh₅₀ was 14.073h for the former and 21.036h for the latter liquid. The rice tillering branch fermentation liquid had better inhibitory effects on cyanobacteria (M. aeruginosa) and green algae (Chlorella pyrenoidosa, Scenedesmus obliquus), and had the best inhibitory effect on M. aeruginosa (P<0.05). Under the stress of rice tillering branch fermentation liquid, the contents of chlorophyll a, phycocyanin (PC) and allophycocyanin (APC) of M. aeruginosa decreased, the autofluorescence value of algal cell chlorophyll decreased continuously, and the algal cell structure was destroyed. It was speculated that one of the anti-algae mechanisms of rice tillering branch fermentation liquid might use the photosynthetic system of algae cells as its attack target to inhibit the growth of algae, and ultimately destroy the cell structure and cause cell apoptosis.

Key words： rice tillering branches allelopathy algae inhibition mechanism photosynthesis

Received: 01 September 2020

PACS:	X173
	X52

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	HU Chun-xia
	CHEN Bo
	ZHANG Ting-ting

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HU Chun-xia,CHEN Bo,ZHANG Ting-ting. Study on the algae inhibition effect and mechanism of the fermented liquid of rice straw[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1925-1931.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I4/1925

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