土壤有机质为森林生态系统生产力构成的重要部分，是森林生态系统生物循环中的重要环节之一。
Soil organic matter is a very important part of forest ecosystem productivity, and is also a very important tache of biological cycling in forest ecosystem.
土壤有机质是土壤的重要组成部分，土壤有机质的存在直接或间接地影响土壤的物理、化学和生物等许多性质。
Soil organic matters (SOM) are important components in soil, and they would affect the physicochemical, chemical and biological properties of the soil directly or indirectly.
土壤有机质中的碳是地球碳库的重要组成部分，它参与全球碳循环。土壤有机质分解而产生的CO2和CH4是重要的温室气体。
The carbon in soil organic matter (SOM) is a significant component of the earth's carbon reservoirs, and participates in the global carbon circulation.
土壤有机质中的碳是地球碳库的重要组成部分，它参与全球碳循环。土壤有机质分解而产生的CO2和CH4是重要的温室气体。
The carbon in soil organic matter (SOM) is a significant component of the earth's carbon reservoirs, and participates in the global carbon circulation.
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