土壤质地与结构教学课件

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,土壤质地和结构,Soil Texture and soil structure,Contents,4.1 Three-phase composition of soil,土壤三相组成,4.2 Soil texture,土壤质地,4.3 Soil structure,土壤结构,4. 4 Soil porosity and soil cons,土壤孔性和土体构造,第一节土壤三相组成,hree-phase composition of soil,土壤圆、液、气三,atmosphere,气,相农积比,反映土壤,water,水、气关糸。,行视质,水,、二相示悲,ganic matter,矿物质,mineral,、土壤的密度和容重,Soil density and bulk density,(一)土壤密度 Soil density,单位容积固体土粒(不包括粒间孔隙的质量(gm3),矿物组成,影响因素,有机质含量,土壤质地,多数土壤密度为2.6-2.7g/cm3,常用密度值2.65,5/26/201,g/cm,土壤中常见组分的密度,组分,密度(g/m)组分密度(g/m),石英,2.60-2.68,赤铁矿,4.90-530,正长石,2.54-2.57,磁铁矿,5.035.18,斜长石,2.622.76,三水铝石,2.302.40,白云母,2.77-2.88,高岭石,2.612.68,黑云母,2.70-3.10,蒙脱石,2.532.74,角闪石,2.853.57,伊利石,2.602.90,辉石,3.15-3.90,腐殖质,1,40180,纤铁矿,3.604.10,