土壤有机碳（SOC）是全球碳循环的重要组成部分，它具有直接影响全球碳平衡。
Soil organic carbon (SOC) is an important component of the global carbon cycle, and it has direct effects on the global carbon balance.
目前中国森林覆盖率为1392%，到本世纪末全国森林覆盖率将达到15%，对全球碳平衡具有重要作用。
At present, the rate of forest cover in China is 13 92% and it will be 15% at the end of twentieth century.
北方森林因其面积大、土壤碳储量高以及对全球暖化响应敏感而在全球碳平衡和气候系统中起着至关重要的作用。
The boreal forest plays a crucial role in the global carbon budget and climatic system because of its large area, great soil carbon storage, and sensitive responses to the global warming.
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