Conservation and restoration of endangered aquatic macrophytes in brackish water zones

咸水区濒危水生植物的保护和恢复

基本信息

批准号：
12480163
负责人：
KUNII Hidenobu
金额：
$ 6.85万
依托单位：
Shimane University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12480163/
关键词：
Estuary Conservation ecology Endangered species Zostera japonica Carex rugulosa Aquatic macrophytes Seagrass Lakes Shinji and Nakaumi 絶滅危惧植物カワツルモ保全生態

项目摘要

In brackish Lakes Shinji and Nakaumi and its adjacent water bodies, we found several endangered species such as Ruppia maritima, Zannichellia palustris, Potamogeton pectinatus, Carex rugulosa, Potamogeton Panormitanus, Zostera japonica and Chara corallina var. kyushuensis. Although their conservation and restoration are currently needed, little is known for their life history traits. We thus started the observation on the life cycle and growth characteristics of two species, one Zostera japoncia, a seagrass growing in brackish water zones and the other Carex rugulosa, a brackish wetland plant. Concernign Z. japonica, it was shown that (1) the maximal depth limits relative to minimal light requirements was estimated to be 30% of the irradiance at the surface, provided that Secchi depth of the observation site was c.1.5m, (2) seasonal pattern of rhizome elongation rate was determined and maximum growth was observed during September-October when water temperature was 20-25 ℃, and the plant ceased to grow when water temperature decreased below 15 ℃, and (3) the plant was eurytopic against salinity. Concerning C.rugulosa, no germination was found under the dense canopy and population was maintained by the rhizome growth. It was estimated that the belowground biomass of this plant will decrease in competition with Phragmites australis due to the shading. We also examined the allozymic variation of several endangered aquatic macrophytes including these two plants in order to know the reproductive properties and effects of wave forces and transmitted waves on Z. japonica are also observed experimentally.

在微钻湖Shinji和Nakaumi及其邻近的水体中，我们发现了几种濒临灭绝的物种，例如Ruppia Maritima，Zannichellia Palustris，Potamogeton Pectinatus，Carex Rugulosa，Potamogeton Panormitanus，Zostera Japormitanus，Zostera Japonica和Chara Corallina var。 kyushuensis。尽管目前需要他们的保护和恢复，但他们的人生历史特征几乎没有闻名。因此，我们开始观察两个物种的生命周期和生长特征，一个Zostera japoncia，一种在咸水区中生长的海草和其他Carex Rugulosa（一种咸淡的湿地植物）。 Z. japonica的担忧，结果表明，相对于最低光需求的最大深度估计为表面的辐照度的30％，前提是观察地点的SECCHI深度为1.5m c.1.5m，（2）在9月至10月的水温度下，在水温度下，在水中降低了最大的生长，并且在水温度下，并在20-25-25时，并且在水温度下的最大增长量，并在20-25年的水中降低。（3）该植物是针对盐度的水平。关于鼻虫，在茂密的冠层下没有发现发芽，并且根茎的生长维持了种群。据估计，由于阴影，该植物的地下生物量将在与Australis的phragmites竞争中减少。我们还检查了几种濒临灭绝的水生大型植物的同源变化，包括这两种植物，以了解波力和Z.Japonica对Z. Z. Japonica的生殖特性以及效应。