权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

SUTDIESON THE METHANEFLUX ANDITS CONTROLLING IN NATURAL WETLANDS

自然湿地甲烷通量及其控制研究

基本信息

批准号：
10680498
负责人：
TERAI Hisayoshi
金额：
$ 2.11万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10680498/
关键词：
METHANE FLUX KUSHIRO MIRE ALDER MOOR METHANE ANALYZER WITH SEMI-CONDUCTOR DETECTOR HYDROGEN FLUX RIVER MOUTH ESTURIES DISSOLVED METHANE BUBBLED METHANE 半導体検出器メタンアナライザー低層湿原高層湿原携帯型メタンアナライザー

项目摘要

Studies on the methane flux and its controlling factor was conducted in two natural wetlands, Kushiro mire and river mouth area of the River Nagara. The former was chosen as the largest and highly natural wetland and the latter was a representative wetland received heavy human impact. In Kushiro mire during field studies in July and August, 1998, methane fluxes in alder moor (14〜17mg/mィイD12ィエD1/h) exceeded those in low moor (9〜10 mg/mィイD12ィエD1/h), where the highest fluxes were usually obtained in the former studies. In August 1999, methane flux were measured in 5 sites with different vegetation in alder moor, and flux range of 2.4 〜15 mg/mィイD12ィエD1/hr and the highest flux was obtained at a site of Equisetum fluviatile, which has the same hollow stalk as reed stem. Stable isotope ratio of carbon (δィイD113ィエD1C) in methane collected from both reed stem and bubble at low moor without vegetation were analyzed and -55.1±0.2 per mil for the former and -59.8±0.8 per mil for the latter were obtained. This result indicates that acetate degradation process was more contributed for reed stem methane, and that HィイD22ィエD2/COィイD22ィエD2 process was more responsible for bubble methane.On the other hand, in the lower reach of the River Nagara, methane fluxes were measured at stations of 3km, 6km (just upper reach of river mouth barrage) and 23km from the river mouth in July 1999, and fluxes of 0.6μg/mィイD12ィエD1/h and 1.7mg/mィイD12ィエD1/h were obtained at 23km and 6km station, respectively. No methane flux was obtained at 3km station. These results indicate that river flow stopping and environment change from brackish to freshwater ecosystem by the construction of river mouth barrage evidently enhanced methane fluxes from lower reach of the river.

对钏路沼泽湿地和长良河口湿地的甲烷通量及其控制因素进行了研究。前者被选为最大的和高度自然的湿地，后者是一个代表性的湿地受到严重的人类影响。1998年7月和8月在钏路沼泽进行的野外研究表明，桤木摩尔沼泽的甲烷通量（14 × 17 mg/m ~ 2·D ~（12）D ~（1/h））超过了低摩尔沼泽的甲烷通量（9 × 10 mg/m ~ 2·D ~（12）D ~（1/h））。1999年8月，在桤木摩尔沼泽地5个不同植被类型的样地进行了甲烷通量的测定，通量范围为2.4 × 15 mg/m ~ 2·d ~（12）·d ~（1/h），最高通量出现在一个与芦苇茎相同的空心茎木贼样地。在无植被的低摩尔沼泽中，对芦苇杆和气泡甲烷进行了碳稳定同位素分析，得到芦苇杆和气泡甲烷的碳稳定同位素比值分别为-55.1 0. 2/mil和-59.8 0. 8/mil。这一结果表明，醋酸盐降解过程对芦苇茎甲烷的贡献更大，而HイD22 D2/COイD22 D2过程对气泡甲烷的贡献更大。另一方面，在长良河下游，在3 km、6 km的站点测量了甲烷通量1999年7月，在河口坝上游和河口23 km处测得的通量分别为0.6μg/m ~（-1）D_（12）D_（1/h）和1.7mg/m ~（-1）D_（12）D_（1/h）。在3 km站没有甲烷通量。这些结果表明，河口拦河闸的修建，使河流断流，环境由半咸水生态系统向淡水生态系统转变，明显增强了下游甲烷通量。