Ecological function and functional diversity of aquatic plant vegetation

水生植物植被的生态功能及功能多样性

基本信息

批准号：
15570025
负责人：
TAKAMURA Noriko
金额：
$ 2.11万
依托单位：
National Institute for Environmental Studies
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15570025/
关键词：
ecosystem function nitrogen removal aquatic plant community biodiversity denitrification Lake Kasumigaura nature restoration littoral zone 水生植物群集

项目摘要

In order to evaluate an influence that aquatic plant communities contribute to denitrification activities in littoral zone, in-situ experiment system was developed and seasonal changes of denitrification activities were discussed in Lake Kasumigaura.An acrylic chamber (1180 mm, 320 mm φ) for the experiment was manufactured. This chamber has measuring sensors for pH, oxidation-reduction potential (ORP), dissolved oxygen (DO) and air temperature. An air fun and a pump were also settled. The chambers were set at the depth of 700mm of the experiment site.A denitrification estimating method adopted acetylene inhibition technique (Yoshinari et al., 1977). Two experiment sites were established : the chambers with and without vegetation (reed maces, Typha latifolia), and the chamber with and without addition of acetylene gas. Added acetylene gas was 10%v of air + liquid phase of the chamber. As a matrix for denitrification bacteria, NaNO_3 solution was added to become 1 mg L^<-1> as NO_3^- - N … More in the liquid phase of each chamber. The denitrification activities were measured for 24 or 48 hours.The use of acetylene inhibition technique was applicable to this experiment system, since higher N_2O concentration was found in the chamber with acetylene gas addition than without. Compared with bare site, high N_2O concentration was detected in vegetation site (In May ; vegetation site : 6.0 mg N m^<-2> day^<-1>, bare site : 1.8 mg N m^<-2> day^<-1>). Therefore, it was confirmed that the denitrification activities in vegetation site was higher than in bare site. The denitrification activities varied with season, with the order : Nov. > Jul. > May. >Apr. Furthermore, NO_3^- removal ratio caused by the denitrification showed in the same change with the denitrification activities. There was high correlation between the denitrification activities and oxidative-reduced conditions in liquid phase.These results suggested that withered plants played an important role for the denitrification activity : withered plants increased in autumn and winter provided available organic matter and habitats for the bacteria. It was concluded that aquatic plant communities in littoral zone were very important for nitrogen elimination in lakes and marshes. Less

为了评估一种影响，水上植物群落有助于沿沿岸区的硝化活性做出贡献，开发了原位实验系统，并在kasumigaura湖中讨论了硝化活性的季节性变化。为实验制造了丙烯酸湖（1180 mm，320 mmφ）。该腔室具有用于pH，氧化还原电位（ORP），溶解氧（DO）和气温的传感器。他们也安顿下来的空气娱乐和泵。将腔室设置在实验位点的700mm深度。一种硝化估计方法采用了乙炔抑制技术（Yoshinari等，1977）。建立了两个实验地点：有或没有植被的腔室（芦苇岩，typha latifolia），以及带有和不添加乙炔气体的腔室。添加的乙炔气体为腔室的空气 +液相的10％V。作为非硝化细菌的基质，添加了纳米_3溶液，使其成为1 mg l^<-1>作为NO_3^ - N…在每个腔室的液相中更多。测量24或48小时的分解活性。乙炔抑制技术的使用适用于该实验系统，因为与乙炔气体添加相比，在腔室中发现了更高的N_2O浓度。与裸露位点相比，在植被部位（5月；植被地点：6.0 mg n m^<-2>天^<-1>，裸露位点：1.8 mg n m^<-2> Day^<-1>）。因此，已经确认植被部位的硝化活性高于裸露的现场。反尼特里化活动随季节而变化，命令：11月> 7月>五月。 > APR。此外，由非硝化作用引起的NO_3^ - 与非硝化活性相同的变化显示。在液相中，反硝化活性与氧化还原性疾病之间存在很高的相关性。这些结果表明，枯萎的植物在反硝化活性中起着重要作用：秋天和冬季枯萎的植物增加了可用的有机物和细菌栖息地。结论是，沿海地区的水生植物群落对于消除湖泊和沼泽的氮非常重要。较少的