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

为了评价水生植物群落对滨海区反硝化活动的影响，开发了霞浦湖的原位实验系统并讨论了反硝化活动的季节变化。该实验室配有 pH、氧化还原电位 (ORP)、溶解氧 (DO) 和空气温度测量传感器。试验室设置在试验场地深度700mm处。反硝化估算方法采用乙炔抑制技术(Yoshinari et al., 1977)，设置了两个试验场地：有植被和无植被(芦苇、香蒲)的试验室。 latifolia)，添加和不添加乙炔气体的室为10%v的空气+室的液相。反硝化细菌的基质，在每个室的液相中添加NaNO_3溶液成为1 mg L^<-1>作为NO_3^- - N … More，测量24或48小时的反硝化活性。使用乙炔。抑制技术适用于该实验系统，因为添加乙炔气体的室内N_2O浓度高于未添加乙炔气体的室内，与裸地相比，植被场地中检测到较高的N_2O浓度（In。 5月；植被处：6.0 mg N m^<-2>天^<-1>，裸地：1.8 mg N m^<-2>天^<-1>）因此，证实了反硝化活性。植被场地的反硝化活性随季节的变化而变化，顺序为：11月>7月>4月。此外，反硝化作用对NO_3^-的去除率也表现出相同的变化。反硝化活性与液相氧化还原条件之间存在高度相关性。这些结果表明枯萎植物对反硝化活性起着重要作用：秋季和冬季枯萎植物的增加为反硝化过程提供了可利用的有机物质和栖息地。结论是，滨海地区的水生植物群落对于湖泊和沼泽的氮消除非常重要。