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我国是农业大国，将农田作为一个生命系统进行研究至关重要。土壤动物能够促进农田生态系统的物质循环并改良土壤结构。其类群组成和数量是评价农田生态环境的重要指标。所以研究人员要定期调查物种数和密度。通常采集小动物要用（）方法。丰富度的统计方法通常有两种，分别是（）和（）。
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