笔者还讨论了根际土壤原生动物分布动态变化的内在和外在原因。
The essentiality and influencing factors of protozoa distribution in rhizosphere soil were also discussed in this paper.
适当的时候，采集食物、饮用水、土壤和其他矿石的大块样品用来确定真菌、细菌或原生动物污染物浓度。
When appropriate, bulk samples are collected of food, drinking water, soil, and other matrices in order to determine concentrations of fungal, bacterial, or protozoan contamination.
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