accumulation horizon造句

• ( 3 ) the spatial analysis results showed that the variation of soil clay content was moderate at the direction of vertical section . the soil clay content was highest at the layer of 20 - 40cm , which showed that it is an eluvial accumulation horizon according to long - term cultivation , irrigation and rainfall
  ( 3 )土壤粘粒含量在垂直方向上呈中等变异，整个土体在20 - 40cm土层处的粘粒含量最高，说明土壤表层由于长期耕作、灌溉降雨，土壤粘粒含量有一个淋溶淀积过程。