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覆膜開孔蒸發(fā)條件下斥水土壤水鹽變化規(guī)律
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國家自然科學(xué)基金資助項目(50709028)


Evaporation Experiment on Different Water Repellent Soils under Perforated Plastic Mulch
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    摘要:

    通過不同斥水度土壤覆膜開孔下的室內(nèi)蒸發(fā)試驗,,分析了3種土壤不同斥水度和覆膜開孔影響下,,土壤水分和鹽分的運動特征。試驗結(jié)果表明,覆膜開孔條件下不同斥水度土壤累積蒸發(fā)量與時間平方根呈正比,土壤斥水性抑制土壤水分蒸發(fā);單位膜孔面積的單位深度累積蒸發(fā)量(Er)隨覆膜開孔率增大而急劇減小,與覆膜開孔率的變化關(guān)系可以用冪函數(shù)表示;隨著土壤斥水度增大,,剖面水分蒸發(fā)幅度減小,;開孔率越大,,剖面含鹽量變化幅度越大,而斥水度對剖面含鹽量影響不明顯,。

    Abstract:

    Three different soil textures, soil water and salt movement characteristics under the different water repellencies and open hole ratios of plastic mulch conditions were studied by evaporation experiment on different water repellent soils under perforated plastic mulch. The results showed that cumulative evaporation was proportional to square root of time on different water repellent soils under perforated plastic mulch; evaporation of soil was inhibited by the soil water repellency; cumulative evaporation per unit hole area film(Er) rapidly decreased when the open hole ratios increased, power function of Er and the open hole ratios were established; variation rate of soil evaporation on vertical profile decreased when soil water repellency increased; the more open holes ratio was, the more variation rate of salt on vertical profile would be, and the degree of soil water repellency had weak effect on soil salt.

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陳世平,李毅,高金芳.覆膜開孔蒸發(fā)條件下斥水土壤水鹽變化規(guī)律[J].農(nóng)業(yè)機械學(xué)報,2011,42(5):86-91. Chen Shiping, Li Yi, Gao Jinfang. Evaporation Experiment on Different Water Repellent Soils under Perforated Plastic Mulch[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(5):86-91.

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