土壤发生过程和生物气候环境是影响土壤元素含量地域分异的主要因素。
The process of soil genesis and bioclimatic environment of soil are the main factors affecting the contents of soil elements.
由土壤重金属污染引发的农产品安全和人体健康事件也时有发生，成为影响人类健康和社会稳定的重要因素。
Agricultural safety and health events caused by the heavy metal pollution often occur, it has become the most important factor of human health and the social stability.
田间试验结果表明，影响大豆孢囊线虫病发生程度的主要因素是土壤有机质、茬口、土壤含水量等。
The result of field test shows that the main factors which affect the degree of SCN are organic matter, crops rotation and soil humidity etc.
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