Soil organic matter (SOM) is the constitutive and biological basic substance of soil, is the condition and product of vital activity.
有机质（SOM）是土壤具有结构性和生物性的基本物质，它是生命活动的条件，也是生命活动的产物。
Soil organic matter (SOM) is the constitutive and biological basic substance of soil, is the condition and product of vital activity.
有机质（SOM）是土壤具有结构性和生物性的基本物质，它是生命活动的条件，也是生命活动的产物。
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