植物净化富营养水体过程中温室气体变化及影响因素初探

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摘要本文通过人为添加氮磷模拟水体富营养化，选用常见水生植物设置5个植物净化处理，研究水生植物在净化富营养化水体的过程中，温室气体（CO₂、CH₄、N₂O）的排放特征以及影响因素.结果表明：5个处理的水-气界面CO₂排放通量在19.12~395.19mg/（m²·h）之间，呈现先降后升的变化趋势.5个处理的水-气界面CH₄、N₂O排放通量在0.009~0.96mg/（m²·h）、0.024~6.48mg/（m²·h）之间，均呈现先升后降再升的变化趋势.多元逐步回归方程结果表明，底泥溶解性有机碳（DOC）、底泥氨氮（NH+ 4-N）、水体pH值、水体溶解氧（DO）、水体叶绿素a（Chl.a）共同影响着水-气界面CO₂、CH₄、N₂O排放通量，其中底泥溶解性有机碳（DOC）对水-气界面CO₂、CH₄、N₂O排放通量均存在显著的促进作用，但水体pH值对水-气界面CO₂排放通量的影响在有沉水植物（处理1）的处理中为正作用，在无沉水植物的（处理2、处理3、处理4、处理5）影响为负作用.

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	杨科
	刘丽香
	韩永伟
	邓淏丹
	郑玉萍
	张恩祥

关键词 ：温室气体, 富营养化, 水生植物, 影响因素, 净化

Abstract：Water eutrophication was simulated by artificially adding nitrogen and phosphorus, and setting up five purification treatments with aquatic plants. In our study, the CO₂ effluxes at the water-air interface ranged from 19.12 to 395.19 mg/(m²·h). The CO₂ effluxes decreased slowly, and then increased. The CH₄ and N₂O effluxes at the water-air interface ranged from 0.009 to 0.96mg/(m²·h) and 0.024 to 6.48mg/(m²·h), respectively. The temporal patterns of CH₄ and N₂O effluxes were similar, which slowly increased, and gradually decreased, then eventually increased once again. The results of multiple stepwise regressions showed sediment DOC, sediment NH+ 4-N, pH, DO, Chl.a in the water were significant predictors of GHG effluxes at the water-air interface. Interestingly, sediment DOC had a significant promoting effect on GHG emission effluxes at the water-air interface. Especially, water pH had a positive impact on CO₂ effluxes at the water-air interface in the treatment with submerged plants (Treatment 1), but negative in the treatment without submerged plants (Treatment 2, Treatment 3, Treatment 4, Treatment 5).

Key words： greenhouse gases eutrophic aquatic plant influence factor purification

收稿日期: 2023-02-23

PACS:

X511

基金资助:国家自然科学基金资助项目（41907392）

通讯作者: 刘丽香,副研究员,liulixiang1982@126.com E-mail: liulixiang1982@126.com

作者简介: 杨科(1998-),男,江西宜春人,硕士,主要从事富营养化以及黑臭水体对水体温室气体排放的相关研究.1946284953@qq.com.

引用本文:

杨科, 刘丽香, 韩永伟, 邓淏丹, 郑玉萍, 张恩祥. 植物净化富营养水体过程中温室气体变化及影响因素初探[J]. 中国环境科学, 2023, 43(10): 5403-5411. YANG Ke, LIU Li-xiang, HAN Yong-wei, DENG Hao-dan, ZHENG Yu-ping, ZHANG En-xiang. Preliminary study on the changes and influencing factors of greenhouse gases during the purification of eutrophic water by plants. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5403-5411.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I10/5403

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