黄土区深层土壤干燥化程度的评价标准

Standards for Assessing Desiccation of Deep Soil Layer on Loess Plateau

黄土高原地区深层土壤干燥化是人工林草植被过度耗水导致土壤水分负平衡的结果。如何定量评价深层土壤的干燥化程度,有助于确定适宜的植被类型和密度,保证人工植被建设的顺利进行。将土壤水分的几个主要指标与水分特征曲线相结合,从能量的角度初步建立了黄土高原地区深层土壤干燥化程度的评价标准,并利用该标准评价了黄土高原沟壑区刺槐林地深层土壤水分的干燥化程度。

The desiccation of deep soil layer on the Loess Plateau results from the gradual depletion of storing water during the process of vegetation rehabilitation. How to assess quantitatively the desiccation of deep soil layer is of great importance to determine the reasonable vegetation type and density and guarantee vegetation rehabilitation. Combined soil water characteristic curve with specific soil water contents, the standards were preliminarily established for assessing the desiccation of deep soil layer on the Loess Plateau. Moreover, the standards were applied to assess the desiccation of deep soil layer on hillsides with locust on the loess tableland gully region.