黄土高原地区几种土壤的水分状况与能量水平  

Moisture characteristics and energy balance of several soils in Loess Plateau

作　　者：马爱生[1] 刘思春[1] 吕家珑[1] 权定国 郭文龙 赵懿 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]陕西省乾县土肥站,陕西乾县713300 [3]陕西省仪祉农业学校,陕西泾阳713702

出　　处：《西北农林科技大学学报（自然科学版）》2005年第11期117-120,共4页Journal of Northwest A&F University(Natural Science Edition)

基　　金：教育部博士点基金项目(20040712001)

摘　　要：采用土壤张力计和土壤吸力平板仪测定了黄绵土、黑垆土、黄墡土和(?)土4种土壤的原状土样和 扰动土样的水分特征曲线,并研究了4种土壤水分能量状况。结果表明,在20℃条件下,4种土壤的水分特征曲线 皆呈现一定的规律性,当土壤含水量在170-280 g／kg时,土壤水势大小顺序为黄绵土>黑垆土>黄墡土>(?)土。 田间原状土的土壤水分特征曲线与扰动土有较大差异,当土壤含水量在170-280 g／kg时,在土壤含水量相同条件 下,原状土的土壤水势大于扰动土,土壤水势在0--90 kPa时,原状土的含水量小于扰动土,原状土与扰动土土壤 水势的差异大小为(?)土>黄墡土、黑垆土>黄绵土。土壤水势为0--20 kPa时,土壤比水容量随水势降低而逐渐 降低,土壤在高水势段的比水容量呈现出(?)土>黄墡土>黑垆土>黄绵土的趋势,原状土的比水容量大于扰动土。By using tensiometer and soil suction plane-table ,the soil characteristics and water potential of 4 soils Loess soil （L）,Hei lou soil （H）,Huang shan soil （Hu）and Lou soil （Lou）,in Loess plateau were determined. The results showed that water characteristic curves of 4 tested soils bad the similar trend under certain temperature （20℃）.The order of soil water potentials of these soils was L〉H〉Hu〉Lou when soil moisture content ranged from 170 g/kg to 280 g/kg. There was a big difference on soil water characteristic curves between intact soils and disturbed （refilled） soils. Water potential of intact soils were bigger than that of disturbed soil when soil moisture content ranged from 170 g/kg to 280 g/kg. While when soil water potential ranged from 0 to -90 kPa,soil water content in intact soils were smaller than that of disturbed soils. The difference of water potentials between intact soil and disturbed soil was in the order of Lou〉Hu〉H〉L. The specific water capacities （SWC） of soils reduced with the decrease of soil water potential when soil water potential ranged from 0 to -20 kPa. SWC of these soils were ranked as Lou〉Hu〉H〉L in higher water potential part,while SWC of intact soils were bigger than that in disturbed soils.

关 键 词：原状土 扰动土 土壤水分特征曲线 土壤水势 比水容量 

分 类 号：S152.7[农业科学—土壤学]