Decomposition of aquatic macrophytes usually generates significant influence on aquatic environment. Study on the aquatic macrophytes decomposition may help reusing the aquatic macrophytes litters, as well as controlling the water pollution caused by the decomposition process. This study verified that the decomposition processes of three different kinds of aquatic macrophytes (water hyacinth, hydrilla and cattail) could exert significant influences on water quality of the receiving water, including the change extent of pH, dissolved oxygen (DO), the contents of carbon, nitrogen and phosphorus, etc. The influence of decomposition on water quality and the concentrations of the released chemical materials both followed the order of water hyacinth > hydrilla > cattail. Greater influence was obtained with higher dosage of plant litter addition. The influence also varied with sediment addition. Moreover, nitrogen released from the decomposition of water hyacinth and hydrilla were mainly NH₃-N and organic nitrogen while those from cattail litter included organic nitrogen and NO₃⁻-N. After the decomposition, the average carbon to nitrogen ratio (C/N) in the receiving water was about 2.6 (water hyacinth), 5.3 (hydrilla) and 20.3 (cattail). Therefore, cattail litter might be a potential plant carbon source for denitrification in ecological system of a constructed wetland.

中文翻译：

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三种水生植物的分解特性及其在人工湿地中作为碳源的潜在应用^☆

水生植物的分解通常会对水生环境产生重大影响。对水生植物分解的研究可能有助于水生植物凋落物的再利用，以及控制分解过程引起的水污染。这项研究证实了三种不同的水生植物（水葫芦，水草和香蒲）的分解过程可能会对接收水的水质产生重大影响，包括pH值的变化程度，溶解氧（DO），水的含量。碳，氮和磷等。分解对水质的影响和释放的化学物质的浓度均遵循水葫芦的顺序 > 水龙头 > 香蒲。较高的植物凋落物添加量获得了更大的影响。影响也随沉积物的添加而变化。而且，从分解放出氮气水葫芦和黑藻主要是NH ₃ -N和有机氮而来自香蒲垫料包含有机氮和NO ₃ ^- -N。分解后，接收水中的平均碳氮比（C / N）约为2.6（水葫芦），5.3（水illa）和20.3（香蒲）。因此，香蒲 凋落物可能是人工湿地生态系统中反硝化的潜在植物碳源。