Cropland surface soil invertebrate living in it is considered as a special ecosystem in cropland - soil system.

农田表土层及其生活在其中的土壤动物被认为是农田土壤生态系统中一类特殊的生态系统.

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The sample is from the surface soil that scientists say covers a layer of ice.

科学家称上面覆盖一层冰的土壤样品是来自火星表层.

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Surface soil organic matter contents of each plantation was higher than that of the control plot.

除念珠相思林以外,人工林表层土壤有机质含量均高于所在试验点的对照地.

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