土壤基质（Soil matrix） 地表岩石经风化一成土作用形成的由小于0.01毫米的矿质和（或）有机质颗粒组成的物质。是形成土壤的基本材料。它不同于原来的岩石（或称母岩），形态、性质均已变化。既非土壤，也非岩石，带有许多母岩特性，长期影响着土壤肥力的形成和发展。
分析结果表明：雨水入渗引起土壤基质吸力的大量丧失；
The results show that the matric suction is lose on account of the rainwater infiltration;
灌水(降雨)对各层土壤基质势的影响随深度的增加而减小。
The influence caused irrigation (rainfall) is to each layer soil matric potential reduces with depth of increment.
增加水分也能在一定程度上减弱因土壤基质差异对幼苗存活和幼苗生长的影响。
Soil types resulted differences to seedling survival and seedling growth, but these differences were greatly reduced by the addition of water.
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