Soil organic matters are an important factor affecting the formation of soil structure.
土壤有机质是形成土壤结构的重要因素。
The seepage erosion and disintegration produced by the activity of ground water will result in formation of soil cave.
岩溶区地下水或地表水的活动，将对土层产生潜蚀作用及崩解作用，进而形成土洞。
The analysis of geographic formation of soil nutrient spatial difference of basalt plateau was made in the fifth part.
第五部分是玄武岩台地土壤养分空间差异的地理成因分析。
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