软围隔系统在迎风岸坡植被恢复中的应用研究

Study on the Application of Soft Enclosure System in Vegetation Restoration of Windward Bank Slope

为改善太湖贡湖生态修复区生境、恢复迎风岸坡水生植被,开展了软围隔系统在迎风岸坡植被恢复中的应用研究。从水质、水动力、水生植物指标3个方面探讨了围隔系统的作用效果。结果表明,围隔组总氮(TN)、总磷(TP)和叶绿素a(Chl-a)含量与对照组相比差异不显著(P>0.05),围隔组透明度极显著高于对照组(P<0.01);围隔系统对表层流速消减率达88.55%,对中层流速消减率达83.47%;经过2层围隔,5个监测点的波浪透射系数分别为0.118、0.070、0.267、0.088和0.164。围隔系统消流消浪效果显著。围隔组3种挺水植物的最大株高、分株数、成活率和生物量均大于对照组。软围隔系统能够为迎风岸坡水生植被恢复提供有利生境条件。

In order to improve the habitat of Gonghu Lake ecological restoration area of Taihu Lake and restore the aquatic vegetation on the windward bank slope,the application of soft enclosure system in the vegetation restoration of windward bank slope was studied.The effect of enclosure system was discussed from three aspects of water quality,water power and aquatic plant indices.The results showed that there was no significant difference of TN,TP and Chl-a between enclosure group and control group(P<0.05),the transparency in enclosure group was extremely significantly higher than that in control group(P<0.01).Trough soft enclosure system,the flow velocity in surface layer was reduced by 88.55%,and the flow velocity in middle layer was reduced by 83.47%.After two layers of enclosures,the wave transmission coefficient of five monitoring sites were 0.118,0.070,0.267,0.088,0.164 respectively.The enclosure system had remarkable wave attenuation effects.The maximum plant height,plant number,survival rate and biomass of three species of emergent plants in enclosure group were greater than those in control group.Soft enclosure system could provide favorable habitat conditions for the aquatic vegetation restoration on the windward bank slope.