| 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、黄墡土和塿土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>塿土。 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塿土>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塿土>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。 |
| 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 |
| DOI： |
| 分类号: |
| 基金项目:教育部博士点基金项目(20040712001) |
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| Moisture characteristics and energy balance of several soils in Loess Plateau |
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| Abstract: |
| 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 had 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. |
| Key words: undisturbed soil disturbed soil characteristic curve of soil water soil water potential specific water capacities |
