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由于受气候、生物、土壤属性等因素的影响,土壤基本物理性质垂直剖面分布也表现出相应的层次性。该研究对青海省大峡灌区典型地块土壤基本物理性质分层次进行测定和分析。结果表明,土壤容重随土层深度的增加呈先增大后减小趋势;土壤孔隙度随土层深度的增加呈先减小后增加趋势,整个土壤层次中0~40和90~150 cm两处为高孔隙度区,其他土层属于低孔隙度区;土壤持水性能指标中的土壤饱和持水量、毛管持水量及田间持水量均随土层深度的增加呈先减小后增加趋势,且三者变化趋势基本一致,均呈近等差递减的趋势。大峡灌区典型样地土壤在垂直方向呈现出上部(0~40 cm)疏松,40~60 cm范围较紧实,下部(60~200 cm)再次趋于疏松。
Due to climate, biological, soil properties and other factors, the vertical distribution of the basic physical properties of soil also showed a corresponding level. The study measured and analyzed the basic physical properties of soils in the typical plots of Daxia Irrigation Area in Qinghai Province. The results showed that the bulk density of soil first increased and then decreased with the increase of soil depth. The soil porosity first decreased and then increased with the increase of soil depth. The soil porosity of 0-40 and 90-150 cm And the other soil layers belong to the low porosity region. The soil saturated water holding capacity, capillary water holding capacity and field water holding capacity in soil water retention index firstly decrease and then increase with the increase of soil depth, The three trends are basically the same, showing a trend of nearly equal decreasing. Soil in the typical plot of Daxia Irrigation Area showed vertical (0 ~ 40 cm) loosening in the vertical direction, 40 ~ 60 cm range firmer and lower (60 ~ 200 cm) again loosening.