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滨海再生水河道中沉水植物的恢复对水质的改善

Keywords: 沉水植物,恢复,再生水,盐度,水质,天津滨海新区

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Abstract:

通过连续监测河道水质与沉水植物生物量的变化,对天津滨海新区一个景观再生水河道开展了为期2年(2004—2005)的中试规模的研究,以期了解含盐再生水中沉水植被的恢复对水质的影响。结果表明,重建沉水植被后河道水质有显著改善。沿河道水流方向,水体中的营养盐和沉水植物的生物量呈下降趋势,叶绿素a的值则沿河道呈上升趋势,河道水体中的COD基本上没有变化,河道水体中的盐度与河道底泥的盐度在两年之内平衡在4000mg·L-1左右。相关分析发现沉水植物的生物量与叶绿素a呈显著的线性负相关。沉水植物能够通过吸收作用减少底泥对再生水中营养盐的富集,耐盐沉水植物川蔓藻(Ruppiamaritima)和篦齿眼子菜(Potamogetonpectinatus)可以作为修复沿海盐水河流水质的先锋植物。

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