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冬季水生植物分解过程及其对水质的影响研究

DOI: 10.11654/jaes.2015.02.021

Keywords: 水生植物 分解 环境因子 营养盐

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Abstract:

通过室内模拟实验,研究太湖3种常见水生植物芦苇(Phragmites australis)、马来眼子菜(Potamogeton malaianus)和荇菜(Limnanthemun nymphoides)冬季分解过程以及对水质的影响.结果表明:芦苇、马来眼子菜和荇菜的快速分解期为前4 d,在这4 d内干物质分别减少了15.9%、12.9%和38.8%;第4~48 d为缓慢分解期,3种水生植物干物质剩余量差异显着(P<0.01).分解速率k与植物残体内的C/N显着负相关(P<0.01,n=54),与C/P呈显着负相关(P<0.01,n=54).实验前4 d,植物组水体pH、DO值迅速下降,之后缓慢上升,总体都表现为对照组 > 芦苇组 > 马来眼子菜组 > 荇菜组;实验初期,植物分解向水体中释放大量N、P营养物质,水体TN、TP分别在第2、4 d达到最大,但是其对水质影响具有时效性,实验后期各组水质均无明显差异

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