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引用本文:马廷婷,熊丽黎,张大文,李宽意,胡忠军,吴召仕.淹水条件下鄱阳湖3种湿地植物腐烂分解及其对水质的影响.湖泊科学,2021,33(5):1389-1399. DOI:10.18307/2021.0508
Ma Tingting,Xiong Lili,Zhang Dawen,Li Kuanyi,Hu Zhongjun,Wu Zhaoshi.Effects of decomposition of three plants on water quality during inundation period in Lake Poyang*. J. Lake Sci.2021,33(5):1389-1399. DOI:10.18307/2021.0508
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淹水条件下鄱阳湖3种湿地植物腐烂分解及其对水质的影响
马廷婷1,2,3, 熊丽黎3,4,5, 张大文6, 李宽意1,2,3, 胡忠军1,2, 吴召仕3
1.上海海洋大学水产科学国家级实验教学示范中心, 上海 201306;2.上海海洋大学上海水产养殖工程技术研究中心, 上海 201306;3.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008;4.江西省水资源监测中心, 南昌 330009;5.鄱阳湖水文生态监测研究重点实验室, 南昌 330009;6.江西省农业科学院农产品质量安全与标准研究所, 南昌 330009
摘要:
大型通江湖泊水位不断变化,引起湖泊水域与洲滩湿地之间相互转化,造成湿地植物周期性淹没分解,影响水体营养物质循环和能量流动.本文以鄱阳湖典型湿地植物灰化薹草(Carex cinerascens)、蒌蒿(Artemisia selengensis)和虉草(Phalaris arundinacea)为研究对象,通过为期69 d的室外模拟实验,探究3种植物腐烂分解对水环境因子和浮游植物生物量(以叶绿素a(Chl.a)浓度表征)的影响.结果表明:(1)3种湿地植物的分解过程均为前期分解较快、后期缓慢,且蒌蒿分解率显著大于灰化薹草和虉草.(2)腐烂分解过程中,水体理化因子均发生了显著变化,如水体pH呈先降低后升高的趋势,且空白组pH显著高于其他实验组.浊度、营养盐浓度和高锰酸盐指数(CODMn)浓度均呈先升高后降低并逐渐稳定的变化趋势,且显著高于空白组,蒌蒿腐烂分解对水体pH、浊度、营养盐浓度和CODMn的影响最大.(3)灰化薹草组和虉草组Chl.a浓度均呈前期波浪式上升、后期逐渐稳定的变化趋势;蒌蒿组Chl.a浓度整体呈逐渐上升的趋势.水体浊度和营养盐浓度是影响浮游植物生长的主要因素.
关键词:  植物腐烂  淹水期  鄱阳湖  水质  浮游植物
DOI:10.18307/2021.0508
分类号:
基金项目:国家自然科学基金项目(41977195,51879256)、江西省自然科学基金项目(20192BAB206049)、江西省水利厅科技项目(202022YBKT02)和中国科学院科技服务网络计划区域重点项目(KFJ-STS-QYZD-099)联合资助.
Effects of decomposition of three plants on water quality during inundation period in Lake Poyang*
Ma Tingting1,2,3, Xiong Lili3,4,5, Zhang Dawen6, Li Kuanyi1,2,3, Hu Zhongjun1,2, Wu Zhaoshi3
1.National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, P. R. China;2.Shanghai Engineering Research Center of Aquaculture, Shanghai Ocean University, Shanghai 201306, P. R. China;3.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;4.Water Resources Monitoring Center of Water Resources of Jiangxi Province, Nanchang 330009, P. R. China;5.Research Key Laboratory of Hydrology and Ecology Monitoring of Poyang Lake, Nanchang 330009, P. R. China;6.Institute for Quality & Safety and Standards of Agricultural Products Research, Jiangxi Academy of Agricultural Science, Nanchang 330009, P. R. China
Abstract:
Water level varies periodically in Yangtze-connected lakes, which leads to interconversion transformation between lake and wetland. Wetland plants decompose when the water level rises, and affect the nutrient cycle and energy flow in water. Based on the litter bag method, a 69-day experiment about decomposition was conducted with three typical species, i.e., Carex cinerascens, Artemisia selengensis and Phalaris arundinacea. Our study was aimed at exploring the effects of plant decomposition on water quality and phytoplankton biomass (measured as chlorophyll-a (Chl.a) concentration). The results showed that the decrease of the three plants was rapid at the beginning and slow after, and the decomposition rate in A. selengensis was significantly higher than that in C. cinerascens and P. arundinacea. The concentration of water physical and chemical factors has changed, the pH decreased firstly and then increased, with significantly high values in a blank group. The turbidity, nutrients and the concentration of permanganate index increased at first, then decreased and became stable finally, with significantly higher values in A. selengensis. The concentration of Chl.a in C. cinerascens group and P. arundinacea group increased firstly, then decreased and became stable finally. The concentration of Chl.a in A. selengensis group generally increased. The main factors affecting the growth of phytoplankton are turbidity and the concentration of the nutrient.
Key words:  Plant decomposition  inundation period  Lake Poyang  water quality  phytoplankton
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