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Methane Release From Wetlands And Watercourses In Europe

机译：欧洲湿地和水道的甲烷排放

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This study was conducted to estimate annual CH_4 efflux from wetlands and watercourses in Europe and some adjacent areas. Wet ecosystems were divided into seven categories: ombrotrophic mires, minerotrophic mires, freshwater marshes, saltwater marshes, small lakes, large lakes and rivers. The geographical distribution and total area coverage for each of these respective ecosystems were taken from CORINE 2000, Global Land Cover 2000 [JRC, 2003. Harmonisation, mosaicing and production of the Global Land Cover 2000 database (Beta Version). EUR 20849 EN, Joint Research Center, Ispra, Italy] and ESRI 2003 databases. CH4 release factors were obtained from an extensive overview of published literature. Less than 3% of the study area of 22,560,000 km~2 consisted of wetlands and watercourses. Large lakes (40%), minerotrophic mires (24%) and ombrotrophic mires (20%) covered almost 85% of the total area of wetlands and watercourses. The total CH4 release from European wetlands and watercourses was estimated to be 5.2 Tg a~(-1). CH_4 release from minerotrophic mires (48%), large lakes (24%), and ombrotrophic mires (12%) composed most of the total CH_4 efflux. High variation in the rate of CH_4 release within the main ecosystem types, small number of studies in some ecosystems and ecologically inadequate land-cover classification are the main reasons for the uncertainties of the estimate. A better estimation of European CH_4 effluxes from natural sources, now and future, would require: a much more detailed and ecologically relevant mapping of the area of different types of wetlands and watercourses, and long-term measurements of CH_4 fluxes and their controlling environmental factors in poorly studied types of wetlands and watercourses. Finally, the data could be used for dynamic modelling of CH_4 fluxes in the current and changing environmental conditions.
机译：进行这项研究是为了估算欧洲和一些邻近地区的湿地和水道每年的CH_4排放量。湿的生态系统分为七类：营养营养不良的沼泽，矿质营养不良的沼泽，淡水沼泽，盐水沼泽，小湖，大湖和河流。这些各自生态系统的地理分布和总覆盖范围取自CORINE 2000，《 Global Land Cover 2000》（JRC，2003年。《 Global Land Cover 2000》数据库（测试版）的协调，镶嵌和制作。 EUR 20849 EN，联合研究中心，意大利Ispra]和ESRI 2003数据库。 CH4释放因子是从广泛的公开文献中获得的。 22,560,000 km〜2的研究区域中只有不到3％由湿地和水道组成。大型湖泊（40％），矿化泥潭（24％）和非营养泥潭（20％）几乎覆盖了湿地和水道总面积的85％。从欧洲湿地和水道释放的总CH4估计为5.2 Tg a〜（-1）。 CH_4从矿养性泥潭（48％），大型湖泊（24％）和非营养性泥沼（12％）的释放构成了CH_4总外排的大部分。主要生态系统类型中CH_4释放速率的高变化，某些生态系统中的研究数量少以及土地覆盖分类的生态学不足是造成估算不确定性的主要原因。现在和将来，要更好地估算来自自然资源的欧洲CH_4排放量，需要：对不同类型的湿地和水道面积进行更详细的，与生态相关的制图，以及CH_4通量及其控制环境因素的长期测量在对湿地和水道类型研究不足的地方。最后，该数据可用于当前和不断变化的环境条件下CH_4通量的动态建模。

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