丘陵紫色砾质土/砾石土持水性研究  

Study on Water Retention Capability of Purple Rock Fragment Soils in Hills

作　　者：李燕[1] 刘吉振[1] 魏朝富[2] 龚久平[1] 洪云菊[1] 柴勇[1] 

机构地区：[1]重庆市农业科学院质量标准检测技术研究所,重庆400055 [2]西南大学资源环境学院,重庆400716

出　　处：《西南师范大学学报（自然科学版）》2009年第4期62-67,共6页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：国家水体污染控制与治理科技重大专项资助(2008ZX07425-003)

摘　　要：通过红棕紫泥、灰棕紫泥、棕紫泥和粗暗紫泥的水分实验，研究了丘陵紫色砾质土／砾石土的持水性．结果表明：考虑砾石，饱和含水量减少0．70％～10．70％，田间持水量减少2．07％～4．33％；砾石含量〈10％，饱和含水量和田间持水量与砾石含量关系不明显；砾石含量〉10％，饱和含水量和田间持水量与砾石含量变化趋势相反；在0～30kPa吸力段，不同坡位0～20cm土层的持水能力、比水容量与砾石含量变化趋势一致，与物理性粘粒含量变化趋势相反；水分特征曲线幂函数拟合式的a值与砾石含量变化趋势相反，b值与砾石含量变化趋势一致．With the experiments of soil water for red-brown purple soils, grey-brown purple soils, brown purple soils and coarse dark purple soils ,the article studied water retention capability of purple rock fragment soils in hills. The results showed that： Considered rock fragments, the saturated water content reduced 0.70%-10.70% and the field capacity reduced 2.07%-4.33%. the saturated water content and the field capacity hadn＇t obvious relationship when rock fragment contents less than 10%, the saturated water content and the field capacity had reverse trend when rock fragment contents more than 10%. In 0- 30 kPa, the water-holding capacity and the specific water capacity of 0-20 cm soil layer in different slope positions were in accordance with rock fragment contents and opposite to physical clay content. The a values of simulating formula of power functions for water retention characteristic curves were opposite to rock fragment contents and the b values were in accordance with rock fragment contents.

关 键 词：紫色土 砾石 含水量 水分特征曲线 比水容量 

分 类 号：S151[农业科学—土壤学]