挺水植物芦苇的腐解对水体水质的影响

The Influence of Bulrush Litter Decomposition on Water Quality

对挺水植物芦苇的残体进行腐解试验,研究了不同投加量下,芦苇残体的腐解对水体水质的影响,及底泥的存在对芦苇残体腐解过程的影响。结果表明:芦苇腐解过程中,水体水质出现了较为剧烈的变化,水体pH和DO浓度均有明显的降低,水体TOC、TN、NH_3-N、NO_3^--N、NO_2^--N和TP浓度均出现了不同程度的升高;当残体投加量为0.4 g/L时,水体pH和DO浓度的最低值分别为5.13和3.11 mg/L,均低于初始值(7.78和8.17 mg/L),水体TOC、TN、NH_3-N、NO-_3^-N、NO_2^-N和TP浓度最高值分别为28.67、2.21、1.43、0.61、0.28和0.28 mg/L,均高于初始浓度(0);当腐解过程中存在底泥时,水体水质的变化程度明显低于无底泥时,因此,建议芦苇的腐解在底泥存在时进行。

Decomposition experiment of the litter of emergent aquatic plant bulrush was carried out to investigate the influence of the decomposition process on the water quality under different dosage of the bulrush litter.Meanwhile,the effect of sediment addition on the decomposition process was also studied. The results showed that the water quality was greatly changed during the decomposition process of bulrush litter,resulting in the decrease of p H and DO,and the increase of TOC,TN,NH_3-N,NO_3^-N,NO_2^-N and TP at different level. When 0. 4 g/L of bulrush litter was added,the lowest value of p H and DO in the water reached 5. 13 and 3. 11 mg/L respectively which were both lower than the initial values（ 7. 78 and 8. 17 mg/L）. Moreover,TOC,TN,NH_3-N,NO_2^-N,NO_2^-N and TP reached 28. 67,2. 21,1. 43,0. 61,0. 28 and 0. 28 mg/L respectively,which were all higher than the initial values（ 0）. Additionally,the change scope of water quality with sediment addition was obviously smaller than that without sediment during the decomposition process. Therefore,the decomposition of bulrush litter should be proceeded with sediment addition.