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采用亮蓝(Brilliant blue,FCF)野外染色示踪实验和图像分析技术,研究了陇中黄土高原安家坡流域典型植物种群下土壤大孔隙分布特征及其与植物种群和土壤物理性质的关系。结果表明:6种植物种群下土壤中的大孔隙流不同,大孔隙流使水分在土壤中的运移深度提高了2～3倍;随着土层深度的加深,6种植物种群下土壤的染色面积均呈减小趋势;6种植物种群下土壤中各级别大孔隙以2、3级大孔隙最多,平均占染色面积的29.3%和29.4%,其次是1级和4级大孔隙,分别占17%和19.8%,5级特大孔隙最低,占4.5%。大孔隙分布特征与土壤有机质含量和容重有关。
The distribution characteristics of soil macropores under typical plant populations in Anjiapo Loess Plateau of Longzhong and their relationship with plant population and soil physical properties were studied by Brilliant blue (FCF) field staining tracing experiments and image analysis techniques. The results showed that macropore flow was different in the soils under the six plant populations, and macropore flow increased the depth of water transport in the soil by 2-3 times. With the deepening of soil depth, And the staining area decreased. The macropores of 2,3 kinds of macropores in soils under the six plant species were the most, accounting for 29.3% and 29.4% of the staining area on average, followed by macropores 1 and 4, respectively Accounting for 17% and 19.8%, the lowest level 5 super-large pores, accounting for 4.5%. The distribution characteristics of macropores are related to soil organic matter content and bulk density.