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水生植物腐烂分解对水质的影响

唐金艳,曹培培,徐驰,刘茂松**   

  1. (南京大学生命科学学院, 南京 210093)
  • 出版日期:2013-01-18 发布日期:2013-01-18

Effects of aquatic plants during their decay and decomposition on water quality.

TANG Jin-yan, CAO Pei-pei, XU Chi, LIU Mao-song   

  1. (School of Life Sciences, Nanjing University, Nanjing 210093, China)
  • Online:2013-01-18 Published:2013-01-18

摘要: 对6种水生植物进行64 d的腐烂分解试验,对比不同水生植物腐烂分解过程中水体营养盐浓度的变化.结果表明: 6种水生植物的腐烂分解速率差别较大,浮叶植物分解速度最快,沉水植物次之,挺水植物最慢.不同水生植物腐解过程对水质影响不同,并与植物生物量密度相关.挺水植物芦苇腐解过程中的水体化学需氧量、总氮和总磷浓度最低;在茭草分解后期,水体化学需氧量和总氮浓度上升,水质变差.浮叶植物荇菜和莲腐解过程中,水体化学需氧量和总氮浓度高于其他植物.沉水植物菹草和狐尾藻腐解过程中,水体铵态氮、硝态氮和总磷浓度最高.对于同一种植物,不同生物量密度处理下,主要水质指标变化趋势相似.适量的植物残体的存在可以有效促进水体氮、磷等营养元素的循环,一定程度上去除硝态氮,降低水体氮负荷.

关键词: 水生植物, 腐烂分解, 营养盐, 水质, 生物量密度

Abstract: Taking 6 aquatic plant species as test objects, a 64-day decomposition experiment was conducted to study the temporal variation patterns of nutrient concentration in water body during the process of the aquatic plant  decomposition. There existed greater differences in the  decomposition rates between the 6 species. Floating-leaved plants had the highest decomposition rate, followed by submerged plants, and emerged plants. The effects of the aquatic plant species during their  decomposition on water quality differed, which was related to the plant biomass density. During the  decomposition of Phragmites australis, water body had the lowest concentrations of chemical oxygen demand, total nitrogen, and total phosphorus. In the late decomposition period of Zizania latifolia, the concentrations of water body chemical oxygen demand and total nitrogen increased, resulting in the deterioration of water quality. In the  decomposition processes of Nymphoides peltatum and Nelumbo nucifera, the concentrations of water body chemical oxygen demand and total nitrogen were higher than those during the decomposition of other test plants. In contrast, during the  decomposition of Potamogeton crispus and Myriophyllum verticillatum, water body had the highest concentrations of ammonium, nitrate, and total phosphorus. For a given plant species, the main water quality indices had the similar variation trends under different biomass densities. It was suggested that the existence of moderate plant residues could effectively promote the nitrogen and phosphorus cycles in water body, reduce its nitrate concentration to some extent, and decrease the water body nitrogen load.

Key words: aquatic plant,  , decomposition, nutrient, water quality, biomass density.