【摘要】 为阐明宁南黄土丘陵区不同植被措施与土壤水分特征之间的关系,应用离心机法及定水头法分别测定土壤的水分特征曲线及土壤饱和导水率,研究该地区植被措施下土壤的水分特征。结果表明:土壤含水量与土壤水吸力之间的关系符合幂函数θ=aSb,且相关水平达极显著。参数a的大小与不同植被有一定的关系,且呈现出有规律的变化,苜蓿>沙棘>天然草>杏树>柠条>农田。土壤饱和导水率天然草与苜蓿最高,农田最低,沙棘、柠条等灌木林地居中。在同一吸力范围内,苜蓿的含水量最高,沙棘次之,天然草、柠条及杏树含水量基本相同,农田最低。在低吸力段土壤平均含水量为苜蓿>沙棘>农田>天然草>杏树>柠条,但除苜蓿及沙棘外,农田、天然草、杏树及柠条差异不大。在中吸力阶段,平均土壤含水量苜蓿>天然草>杏树,且苜蓿相对较高,随着土壤吸力的增大,土壤含水量差异逐渐缩小。凋萎含水量除苜蓿最大,其次为沙棘和天然草,柠条、杏树次之,农田最低。更多还原

【Abstract】 In order to illustrate the relation between artificial vegetation and soil moisture characteristics in loess hilly region of Ningxia,the centrifugation method and invariable water height method were used for measuring the curve of soil moisture characteristics and saturated hydraulic conductivity of soil,and the soil moisture characteristics of sloping land in loess hilly region of southern Ningxia were studied.The results showed that there was high power function correlation between the soil moisture and the potential of soil water.The mathematical model was θ=aS~b.The value a and different sloping land were ranged in order from higher ones to lower ones as follow: Medicago lupulina,Hippophae rhamnoides,Natural Grassland,Prunus armeniaca,Caragana korshinskii,farmland.Grassland,Shrubbery,Arbor Forest,cropland.Saturated hydraulic conductivity of Natural Grassland and Medicago lupulina were the highest than the others,and cropland was the lowest,and Grassland,Hippophae rhamnoides and Caragana korshinskii were middle.At the same soil water potential range,soil water content of Medicago lupulina was highest,Hippophae rhamnoides took second place,cropland was the lowest and others’ were around the same.At the low potential range,the average soil water content,from high to low,was Medicago lupulina,Natural Grassland,Cropland,Natural Grassland,Prunus armeniaca,Caragana korshinskii.At the middling soil potential range,the order of average soil water content was Medicago lupulina > Natural Grassland > Prunus armeniaca,and with the soil suction increasing,soil water content changed little.Languishing soil water content of vegetations except Medicago lupulina was still highest,and cropland kept was lowest.更多还原