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运用土壤分形理论,研究黄土高原子午岭土壤粒径和颗粒体积分形维数(Dv)随植被恢复年限的变化特征,以期为黄土高原植被恢复和水土保持建设提供科学指导。研究表明:(1)黏粒、粉粒、砂粒及Dv均在0~10 cm和10~20 cm两土层之间差异显著,在16 a和60 a两年限间差异显著;(2)Dv随土层变化较小(2.326~2.340),随年限变化较大(2.307~2.347),Dv整体符合正态分布u=2.33,δ=0.02;(3)Dv与黏粒和粉粒呈显著的正相关关系,与砂粒呈显著负相关关系;(4)Dv和(<0.05 mm)/(>0.05 mm)粒级比值可表征土壤水土流失的状况。
Based on the theory of soil fractal, the characteristics of soil particle size and volume fraction of fractal dimension (Dv) of vegetation along the Ziwuling Loess Plateau were studied in order to provide scientific guidance for vegetation restoration and water and soil conservation in the Loess Plateau. The results show that: (1) There is significant difference between 0-10 cm and 10-20 cm soil layers of clay, silt and sand and Dv, with significant difference between two years of 16 a and 60 a; (2) Dv Dv was consistent with the normal distribution u = 2.33 and δ = 0.02 with the change of soil layer (2.326 ~ 2.340) and with age (2.307 ~ 2.347) (4) The grain-size ratio of Dv and (<0.05 mm) / (> 0.05 mm) can characterize the status of soil erosion.