土壤孔隙数量 影响土壤比重的因素: 土壤比重仅仅取决于土壤固相颗粒的物质组成。 Since a large portion of most soils is composed of particles derived from quartz minerals, the particle density of most soils is near 2.6g/cc which is the density of quartz. variations in the particle density are due to the presence of heavier minerals like iron oxides or lighter organic components 表4-1土壤中常见组分的密度(克/厘米3) 2.60~2.6 赤铁矿 4.90~5.30 正长石 2.54~2.57 磁铁矿 5.03~5.18 斜长石 2.62~2.76 水铝石 2.30~240 白云母 2.77~2.88 高岭石 2.6l~26 黑云母 2.70~3.10 蒙皂石 2.53~2.74 角闪石 2.85~3.57 伊利石 60~2 3.15~3.90 纤铁矿 3.60~4.10 腐殖质 140~1.80一.土壤孔隙数量 影响土壤比重的因素： 土壤比重仅仅取决于土壤固相颗粒的物质组成。 Since a large portion of most soils is composed of particles derived from quartz minerals, the particle density of most soils is near 2.6 g/cc, which is the density of quartz. Variations in the particle density are due to the presence of heavier minerals like iron oxides or lighter organic components. 表 4-1 土壤中常见组分的密度 (克/厘米 3 ) 石 英 正长石 斜长石 白云母 黑云母 角闪石 辉 石 纤铁矿 2.60～2.68 2.54～2.57 2.62～2.76 2.77～2.88 2.70～3.10 2.85～3.57 3.15～3.90 3.60～4.10 赤铁矿 磁铁矿 三水铝石 高岭石 蒙皂石 伊利石 腐殖质 4.90～5.30 5.03～5.18 2.30～2.40 2.61～2.68 2.53～2.74 2.60～2.90 1.40～1.80