黑藻(Hydrilla verticillata)生长和锚定的沉积物条件需求初步研究

Preliminary study on sedimentary requirements for the growth and anchorage of Hydrilla verticillata

恢复沉水植被是湖泊生态修复工程中的关键环节,明确沉水植物生长和锚定的环境条件是恢复沉水植被的重要前提。本研究以湖泊生态修复常用的沉水植物黑藻(Hydrilla verticillata)为例,结合文献分析、控制实验和野外调查3种方法研究了其生长和锚定的沉积物条件需求。结果表明,黑藻在沉积物有机质含量为0.16%~38.36%、密度为1.08~2.06 g/cm^(3)、含水率为19.80%~78.14%的范围内能正常生长,在沉积物有机质含量为0.64%~21.84%、密度为1.09~2.06 g/cm^(3)、含水率为25.32%~72.06%的范围内适宜生长;在沉积物有机质含量为0.29%~18.30%、密度为1.16~2.06 g/cm^(3)、含水率为19.80%~72.17%的范围内,黑藻植株能够稳定定植。本研究结果可为恢复黑藻提供初步的边界条件数据,也可为其它生态修复常用沉水植物的类似研究提供方法上的借鉴。

Recovery of submerged macrophytes is one of the most important processes in lake restoration projects,while understanding requirements for the growth and anchorage of submerged macrophytes is crucial for restoration of submerged macrophytes.Here,we investigated the sedimentary requirements for the growth and anchorage of Hydrillia verticillata,a species frequently used for lake restoration by using in-situ experiments,field investigation and literatures review.The result showed that H.verticillata could survive at the range of 0.16%-38.36%of sediment organic matter content,1.08-2.06 g/cm 3 of sediment density and 19.80%-78.14%of sediment water content,and the optimal sediment organic matter content,density and water content for the growth of H.verticillata were 0.64%-21.84%,1.09-2.06 g/cm 3 and 25.32%-72.06%,respectively.It also showed that H.verticillata could safely root at the ranges of 0.29%-18.30%of sediment organic matter content,1.16-2.06 g/cm 3 of sediment density and 19.80%-72.17%of sediment water content.These results provide valuable thresholds of sediment parameters for restoration of H.verticillata in lakes and the methods used in this study for determining sediment requirements for H.verticillata can be adopted for other submerged macrophyte species.