摘要
四川盆地3种紫色土的土壤水吸力与土壤含水量呈负相关,土壤水随吸力增加而降低。土壤含水量主要受土壤有机质、土壤质地和土壤胶体性质的影响。土壤持水曲线,通常仅能反映土壤持水量的多寡,但是结合低吸力段土壤水容量的研究,能更好地评价土壤的持水性能和水分的有效程度。3种土壤的持水能力是:灰棕紫泥>红棕紫泥>红紫泥。在<0.03MPa 时,土壤分的有效性是:红紫泥>灰棕紫泥>红棕紫泥。3种土壤水分的渗透力是:灰棕紫泥>红棕紫泥>红紫泥;土壤水分蒸发强度是红棕紫泥>灰棕紫泥。
Soil water suction of three kinds of purple soil in Sichuan area isnegative correlated with soil water content.Soil water content is decre-ased with the increase of soil water suction.The influertial factors ofthe soil water-retention characters in lower suction are related to theorganic matter,texture and colloided properties of soils.Soil water-retention curve only shows that the quantity of water,but specific water capacity(SWC)may be used to correctly evaluate thesoil water-retention characters and availahility of soil moisture.Soilwater-retention characters can be summarized as.gray-brown purplesoil>reddish-brown purple soil>reddish purple soil.Under the low(0.03MPa)water suction,available order of soil moisture is:reddish-purplesoil>gray-brown purple soil>reddish-brown purple soil.
出处
《西南农业大学学报（自然科学版）》
CSCD
1989年第1期1-6,共6页
Journal of Southwest Agricultural University
关键词
紫色土
土壤
持水性
purple soil
soil water retention
Sichuan.
