Department of Thematic Studies-Water and Environmental Studies, Linköping University, SE-58183 Linköping, Sweden.
Science. 2011 Jan 7;331(6013):50. doi: 10.1126/science.1196808.
Inland waters (lakes, reservoirs, streams, and rivers) are often substantial methane (CH(4)) sources in the terrestrial landscape. They are, however, not yet well integrated in global greenhouse gas (GHG) budgets. Data from 474 freshwater ecosystems and the most recent global water area estimates indicate that freshwaters emit at least 103 teragrams of CH(4) year(-1), corresponding to 0.65 petagrams of C as carbon dioxide (CO(2)) equivalents year(-1), offsetting 25% of the estimated land carbon sink. Thus, the continental GHG sink may be considerably overestimated, and freshwaters need to be recognized as important in the global carbon cycle.
内陆水域（湖泊、水库、溪流和河流）通常是陆地景观中大量甲烷（CH(4)）的来源。然而，它们在全球温室气体（GHG）预算中尚未得到很好的整合。来自 474 个淡水生态系统和最新的全球水域面积估计的数据表明，淡水中每年至少排放 103 太克的 CH(4)，相当于每年 0.65 皮克碳作为二氧化碳（CO(2))当量，抵消了估计的陆地碳汇的 25%。因此，大陆温室气体汇可能被大大高估，而淡水需要被视为全球碳循环中的重要组成部分。
