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一、土壤孔隙分布孔隙孔径d(毫米)=3/H(H为厘米水柱高度),可根据土壤水分吸力与容积含水量的关系,算出相应孔径范围的孔隙数量。它对了解土壤通气、透水,水分吸持、移动以及水分吸收的难易均有重要意义,土壤容积含水量=土壤重量含水量×容重。研究表明,土壤中有效水孔隙和无效水孔隙互为消长,呈极密切的负相关。砂质土壤有效水孔隙多、无效水孔隙少;粘质土则有效水孔隙少、无效水孔隙多。不同因子对有效孔隙形成的影响:当0.06～6巴的速效水孔隙(d=0.05～0.0005毫米)及0.06～
First, the soil pore distribution pore size d (mm) = 3 / H (H centimeters of water column height), according to the relationship between soil water suction and volumetric water content, calculate the corresponding pore size of the pore volume. It is important to understand soil aeration, water permeation, moisture holding, movement and moisture absorption. Soil volumetric water content = soil moisture content × volumetric weight. The results show that the effective water pore and invalid water pore in soil are experiencing each other growth and decline, showing a very close negative correlation. Sandy soil more effective water pores, less effective void water; clay soil is less effective water pores, void more water pores. The effect of different factors on effective pore formation: When effective water pores (d = 0.05-0.0005 mm) and 0.06 ~