砾石对丘陵紫色砾质土持水性的影响  

Effects of Gravel on Water Retention Capability of Purple Gravelly Soils in a Hilly Area

作　　者：李燕[1] 刘吉振[1] 魏朝富[2] 易志坚[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：《水土保持通报》2009年第5期35-39,共5页Bulletin of Soil and Water Conservation

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、棕紫泥原状土和扰动土的持水性实验,研究了砾石对丘陵紫色砾质土持水性的影响。结果表明,在考虑砾石的情况下,原状土饱和含水量减少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随砾石含量减少而增加;在0～30kPa吸力段,原状土和扰动土的持水能力、幂函数拟合式的a值、原状土物理性黏粒含量、扰动土比水容量都随砾石含量减少而增大;原状土的比水容量随砾石含量减少而减小。By the experiments of water retention capability for the red-brown purple soils,grey-brown purple soils,and brown purple soils that were disturbed or undisturbed,the effects of gravel on water retention capabilities of purple gravelly soils in a hilly area were studied.Results showed that by considering gravel of undisturbed soils,the saturated water contents were reduced by 0.70%~10.70% and the field capacities,by 2.07%~4.33%.When the gravel content was less than 10%,it did not have an obvious relationship...

关 键 词：紫色土 砾石 含水量 水分特征曲线 比水容量 

分 类 号：S15[农业科学—土壤学]