| 大型水生植物混合腐解对入湖河口水质的影响及适宜生物量研究 |
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| 引用本文： | 陈洪森,魏伟伟,叶春,蔡绪贻,李春华.大型水生植物混合腐解对入湖河口水质的影响及适宜生物量研究[J].环境科学研究,2021,34(3):589-598. |
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| 作者姓名： | 陈洪森 魏伟伟 叶春 蔡绪贻 李春华 |
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| 作者单位： | 中国环境科学研究院,湖泊水污染治理与生态修复技术国家工程实验室,北京 100012;中国地质大学(北京)水资源与环境学院,北京 100083;中国环境科学研究院,湖泊水污染治理与生态修复技术国家工程实验室,北京 100012;中国地质大学(北京)水资源与环境学院,北京 100083 |
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| 基金项目： | 国家水体污染控制与治理科技重大专项（No.2017ZX07203-005） |
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| 摘 要： | 为探究水生植物腐解释放的营养盐在泥-水-植物系统中迁移规律以及冬春季衰亡期大型水生植物的最适生物量，在塑料通风大棚内，开展不同梯度生物量下多种水生植物混合腐解试验.选择冬季蠡湖-陆典桥浜河口区的水生植物为研究对象，根据实际收割规律，设定腐解试验的生物量依次为除根部以外总生物量的0%、20%、40%、60%、80%、100%，于2018年12月25日开展试验，共150 d.结果表明:①与恒温室内条件相比，近自然条件下多种混合水生植物腐解的前2个阶段具有长时性和持续性.②水生植物腐解致使含C、N、P元素的指标在0~30 d内快速升高，70 d左右达到峰值，100 d后缓慢降低直至稳定，整个变化过程持续近120 d，但植物茎叶未彻底分解，多数沉积在底泥表面.③泥-水-植物系统中，试验初期底泥以释放营养盐为主，30 d后以吸附为主；相关性分析表明，茎叶生物量与水体和底泥中养分浓度均呈正相关.研究显示，与其他试验组相比，收割后水生植物生物量剩余20%时更有利于入湖河口水质的改善.
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| 关 键 词： | 大型水生植物 腐解 适宜生物量 泥-水-植物系统 入湖河口 |
| 收稿时间： | 2020/2/27 0:00:00 |
| 修稿时间： | 2020/8/20 0:00:00 |
Effects of Mixed Decomposition of Macrophytes on Water Quality at Lake-River Confluence Area and Suitable Macrophytes Biomass after Harvest |
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| CHEN Hongsen,WEI Weiwei,YE Chun,CAI Xuyi,LI Chunhua.Effects of Mixed Decomposition of Macrophytes on Water Quality at Lake-River Confluence Area and Suitable Macrophytes Biomass after Harvest[J].Research of Environmental Sciences,2021,34(3):589-598. |
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| Authors: | CHEN Hongsen WEI Weiwei YE Chun CAI Xuyi LI Chunhua |
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| Affiliation: | 1.National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, China2.College of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China |
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| Abstract: | In order to explore the migration of nutrients released by decomposition of aquatic plants in the sediment-water-macrophyte system and determine the optimal biomass of aquatic plants after harvest, the decomposition process of mixed aquatic macrophytes under different biomass gradients was studied in a plastic ventilated greenhouse. The aquatic plants in the Lihu Lake-Ludianqiaobang River confluence area in winter were selected as the research objects. Based on the actual harvest experience, the decomposition experiment biomass was set to 0%, 20%, 40%, 60%, 80% and 100% of the total biomass except roots. The experiment was conducted on December 25th, 2018 for a total of 150 days. The experimental results showed that: (1) Compared with the decomposition experiment in a constant temperature chamber, the first two stages of decomposition of mixed aquatic plants under near natural conditions were long-term and persistent. (2) The decomposition of aquatic macrophytes resulted in a rapid increase in C, N and P contents within 30 days, reaching a peak on about the 70th days, and slowly decreasing to a stable state after 100 days. The whole change process lasted for nearly 120 days, but the macrophyte stems and leaves were not completely decomposed, and most of them were deposited on the surface of the bottom sediment. (3) In the sediment-water-macrophytes system, the sediment was mainly released in the initial stage of the experiment, and was mainly stored by adsorption after 30 days. Correlation analysis showed that the biomass of macrophyte stems and leaves was positively correlated with the nutrient concentration in water and sediment. Among the 6 experimental groups, the group with 20% of the aquatic plant biomass remains after harvest was beneficial to the water quality of lake-river confluence area. |
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| Keywords: | aquatic macrophytes decomposition suitable biomass sediment-water-macrophytes system lake-river confluence area |
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