甘肃省典型土壤持水特性及影响因素研究

发布时间：2018-02-11 08:04

本文关键词： 甘肃省典型土壤土壤水分特征曲线比水容量土壤物理性质影响因素　出处：《干旱地区农业研究》2017年01期 　论文类型：期刊论文

【摘要】：研究了甘肃省14个类型区12种典型土壤的物理性质,并测得不同水势下的土壤重量含水量,利用Gardner经验方程拟合出其土壤水分特征曲线,对不同土壤的持水性及其影响因素作了研究。结果表明:甘肃省典型土壤持水能力差异明显,整体而言,甘南高原类型区土壤持水和供水能力较好,区内典型土壤拟合参数A值均在20以上,且较为稳定;陇南山地丘陵类型区土壤供水能力最佳,持水能力较好,区内典型土壤拟合参数A值均在24以上,但稳定性较弱;黄土高原类型区内土壤持水性适中,供水能力较弱,稳定性最佳;河西干旱半干旱类型区的土壤持水、供水能力及稳定性均较差,区内典型土壤除潮土外拟合参数A值均在17以下;土壤质地(0.002 mm粘粒含量)、总孔隙度对甘肃省土壤的持水性影响最为显著,其次为土壤毛管孔隙度、密度和容重。
[Abstract]:The physical properties of 12 typical soils in 14 regions of Gansu Province were studied, and the soil weight and water content under different water potential were measured. The characteristic curves of soil moisture were fitted by Gardner empirical equation. The water holding capacity of different soils and its influencing factors were studied. The results showed that the water holding capacity of typical soils in Gansu Province was obviously different. On the whole, the water holding capacity and water supply capacity of soils in Gannan Plateau were better. The fitting parameters A values of typical soils in this area are all above 20, and they are more stable, the soil water supply capacity is the best and the water holding capacity is better in the mountainous and hilly region of Longnan, and the fitting parameter A value of typical soil in this area is above 24, but the stability is weak. The soil water holding capacity is moderate, the water supply capacity is weak, and the stability is the best in the Loess Plateau, and the soil water holding capacity and water supply stability are poor in the arid and semi-arid type areas of Hexi. The fitting parameters A values of typical soils were all below 17, soil texture was 0.002 mm clay content and total porosity had the most significant effect on soil water holding capacity in Gansu Province, followed by soil capillary porosity, density and bulk density.
【作者单位】：甘肃农业大学资源与环境学院;甘肃省干旱生境作物学重点实验室;宕昌县财政局;甘肃省节水农业工程技术研究中心;
【基金】：甘肃省自然科学基金项目(145RJZA106)
【分类号】：S152.71

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