反映土壤理化性质并影响土壤利用管理的颗粒大小级别、矿物学类型和土壤温度级别是理想的土族分类标准；
Three soil characteristics are selected as family classification criteria. They are particle-size class, soil mineralogical type and soil temperature regime.
接着从土壤性质、氨气、大气颗粒物和天气形式等自然因素方面探讨了中国酸雨现状的形成原因，指出南北方这些自然因素的差异是酸雨现状形成的最重要原因。
Then discuss the acid formation from the soil quality, atmosphere grain, NH 3 and weather forms, point out these natural factor's difference is the most important cause of acid rain formation.
土壤颗粒组成是影响土壤肥力的主要物理性质之一。
Soil particle size distribution is one of the key physical factors regulating soil fertility.
土壤颗粒组成是影响土壤肥力的主要物理性质之一。
Soil particle size distribution is one of the key physical factors regulating soil fertility.
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