滇池福保湾植被重建对底泥再悬浮及营养盐释放的控制

The controlling of plants rebuild engineering on sediment resuspension and nutrient salts release in Fubao Bay of the Dianchi Lake

为估算滇池福保湾植被重建工程对底泥再悬浮及营养盐的控制效果,对重建示范区内及区外进行了悬浮物沉降现场研究,并利用颗粒物捕获器收集底泥悬浮颗粒,分析重建区内、重建区外、不同生活型植物重建区的悬浮颗粒物沉降通量,比较了不同水生植物修复区的颗粒物再悬浮通量,估算了植被重建区底泥再悬浮的通量及营养盐N、P释放量.结果表明:水生植被重建区外悬浮物净沉降量明显高于重建区内,对工程实施效果进行估算,97d内工程区内底泥的再悬浮量、N的释放量、P的释放量分别是区外相同面积的15.71%、13.30%和12.44%,底泥污染控制与植被重建后对沉积物再悬浮抑制作用较为明显,沉水植物对底泥再悬浮的抑制效果相对挺水植物显著.

In order to compare the effects of plants on controlling sediments pollution in Fubao Bay of the Dianchi Lake,suspended matter sedimentation was carried on into plant areas,including submerged plant and emerged plant,and no-plant area by using particulate trap.In the process of on-spot research,suspended matter sedimentation fiux of different areas was analyzed,particulate resuspension flux of different aquatic plant reparation areas was compared.Sediment resuspended flux,nitrogen release and phosphorus release of aquatic plant reparation areas were estimated.It was found that suspended matter sedimentation flux of no-plant areas was obviously higher than aquatic plant reparation areas.Estimation results indicated that sediment resuspended flux,nitrogen release and phosphorus release of in-engineering was the percent of 15.71%、13.30% and12.44% to the same areas out-engineering during 97days.The more effects of reducing sediments resuspension was submerged plant.