甘肃泾川不同林龄人工刺槐林的土壤水分-物理特性及渗透性研究

发布时间：2018-07-31 08:00

【摘要】：【目的】通过对人工刺槐林的土壤水分-物理性质及渗透性进行分析,评估陇东黄土高原泾川县中沟小流域人工刺槐林土壤水文功能,为该地区生态恢复工程建设和流域水土资源管理提供理论参考。【方法】采用环刀法测定不同林龄(20、25、30和35 a)人工刺槐林的土壤水分-物理性质及渗透性。【结果】在0~100 cm土层,不同生长阶段刺槐林土壤容重(g/cm3)均值变化大小依次表现为:25 a(1.330)30 a(1.253)20 a(1.170)35 a(1.161);35 a生样地土壤的饱和蓄水量、毛管蓄水量及最小蓄水量均最大,25 a生样地的最小;4种林龄刺槐林土壤初渗速率的变化范围为2.045~4.718 mm/min,35 a生刺槐林土壤初渗速率最大,且不同林龄间的变化规律与土壤非毛管孔隙度的变化规律基本一致。【结论】35 a生刺槐林的土壤持水能力与渗透性较好,20 a和30 a生次之,25 a生最差。
[Abstract]:[objective] to evaluate the soil hydrological function of artificial Robinia pseudoacacia forest in the middle gully watershed of Jinchuan County, Longdong Loess Plateau, by analyzing the soil moisture physical properties and permeability of artificial Robinia pseudoacacia forest. [methods] the soil moisture and physical properties and permeability of artificial Robinia pseudoacacia forest at different forest ages (20 ~ 2530 and 35 a) were determined by circular knife method. [results] the soil moisture and permeability of artificial Robinia pseudoacacia forest were measured in 0 ~ 100 cm soil layer. The mean value of soil bulk density (g/cm3) of Robinia pseudoacacia forest at different growth stages was: 1 25 a (1.330) 30 a (1.253) 20 a (1.170) 35 a (1.161) a soil saturated storage capacity. The variation range of soil initial osmotic rate of four forest age Robinia pseudoacacia forest was 2.045 ~ 4.718 mm / min ~ 35 mm 路min ~ (35). The variation of soil water holding capacity and permeability of 35 year old Robinia pseudoacacia forest was better than that of the other 25 years old, which was the lowest in 20 years and 30 years old, and the change law of different forest ages was basically the same as that of soil non-capillary porosity. [conclusion] the soil water holding capacity and permeability of 35 year old Robinia pseudoacacia forest were better.
【作者单位】：甘肃农业大学资源与环境学院;平凉市水土保持科学研究所;泾川县官山林场;
【基金】：国家自然科学基金地区项目(41461112) 甘肃省国际合作项目(1504WKCA006)
【分类号】：S714.2

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