Soil acidization, low organic substance and effective nutrients, nutrition defect and disorder are the major problems in rubber plantations of Yunnan.
云南橡胶园土壤存在明显酸化、有机质下降、有效养分降低、缺素和营养失调等问题。
For black soil with high content of organic matter, organic cementing substance is an important factor in forming soil aggregates.
对于有机质含量高的黑土，有机胶结物质是形成土壤团聚体的主要因素。
Organic substance and physical clay of soil are important basis for index division.
其中，土壤有机质和物理性粘粒是重要的指标划分依据。
The density and biomass of soil animal has a positive interrelation to the present content of the fallen, the content of organic substance in soil and vegetation coverage.
土壤动物密度及生物量与调落物年归还量、土壤有机质含量、植被盖度等均呈正相关关系；
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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