微藻及其分泌物对溶解性有机磷矿化的促进效应

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Abstract In order to better understand the mineralization process of dissolved organic phosphorus (DOP) and its related influencing factors in the aquatic ecological environment, the typical DOP types (adenosine-5'-triphosphate disodium salt (ATP), sodium β-glycerophosphoric and D-glucose-6-phosphate disodium salt (GP)), temperatures (4, 15 and 25℃), proportions of Microcystis aeruginosa and its secretions (M. a & EPS) (0%, 50% and 90%), arsenate (As(V)) concentration (0, 10 and 100μg/L) were selected as the main four environmental factors(three levels for each). The L₉(3⁴) orthogonal test was then used to explore the main influencing factors and levels of DOP mineralization process and the main environmental changes during the mineralization process. Results showed that M. a & EPS, as the main influencing factor, could significantly promote the mineralization of DOP at the initial stage (the first 2days), and then was replaced by temperature. Herein the increase of temperature was beneficial to the mineralization of DOP. During the typical DOP mineralization process, the proliferation of algal cells promoted the mineralization of DOP at the optimal temperature(25℃), and caused large fluctuations in pH and ORP in the environment of βP and ATP. The mineralization of DOP in the As(V)-containing environment was accompanied by the transformation of As(V) species. In particular, the production of arsenite (As(III)) was significant in both GP and ATP environments, which could enhance the ecological risk of arsenic. The increased proportion of M. a & EPS promoted the methylation of As(V) in the βP environment. Additionally, the mineralization of individual DOP led to a significant increase in the content of soluble organic matter (DOM) in the environment, which mainly accounted to protein-like components. Meanwhile, the mineralization of DOP combined with M. a & EPS also increased the DOM but with soluble microbial products.The obtain results are of great significance for the comprehensive understanding of the mineralization process of different DOPs in water bodies and the scientific management and control of the ecological risks caused by the outbreak of algal blooms and changes in the water environment.

Key words： orthogonal test organophosphorus mineralization temperature Microcystis aeruginosa arsenic species

Received: 07 June 2011

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X172

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	ZHANG Xiao-yan
	LUO Zhuan-xi
	WANG Zhen-hong

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ZHANG Xiao-yan,LUO Zhuan-xi,WANG Zhen-hong. Promoting effect of microalgae and its secretions on dissolved organophosphate mineralization[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 341-350.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/341

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