The discovery reverses what was thought of as a carbon sink into a carbon source.
相反那些被发现的碳类物质进入到地下使碳汇变成碳源。
Rich, aerated soil is productive, retains water, and, highly significant in environmental terms, is a carbon sink.
肥沃、透气的土壤富饶多产，并能有效锁住水分。 然而相益于环境最多的是碳汇（Carbon Sink）。
Lake sediment nevertheless constitutes an important "carbon sink," serving to store - sometimes for a very long time - a significant portion of the carbon-containing material that does not decompose.
然而湖泊沉积物又是一个重要的“碳汇”，用来存储-有时存储很长的时间-相当大部分不能分解的含碳物质。
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