同一剖面从表层向下骨骼颗粒增多，细粒物质减少。
From the surface to the bottom horizon skeleton increases and plasma decreases.
当试验中细粒物质含量占到总量的28%时，起动所需水量最小。
When the content of the fine material in the slag reaches 28%, the slag is the most vulnerable to start.
沙生植被的增加会显著增加土壤中细粒物质的含量，但多年生草本对风蚀的减缓作用低于灌木；
More vegetation covers make the soil particle finer in sand land, but the perennial herbage decrease the wind erosion less than shrub.
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