桔园地土壤水分与径流的坡位差异研究

Study on Slope Difference of Soil Moisture and Runoff in Hilly Farmland of Citrus Garden

从大气降水-土壤水循环系统出发,于2001～2002年在江西省余江县刘垦农场内桔园地用定位法对土壤水分与径流的坡位差异进行了研究。结果表明,由于上坡、下坡土壤的质地分异,雨季上坡水势值总体上高于下坡,而旱季上坡水势值基本上低于下坡,相对应的土壤水分150cm贮水量及收支平衡也有明显的差异;用径流小区法测定的径流表明,旱季10mm降雨上坡、下坡径流深度为0.596,0.585mm,但雨季上坡、下坡10mm降雨径流深度为0.429,0.488mm。为土壤水分适时调控、节水定量灌溉及分析养分迁移提供依据。

The slope difference of soil moisture and runoff in hilly farmland of citrus garden in Liu Farm of Jiangxi Province, were studied in 2001～2002, based on position-fixed experiment and rainfall-soil water circulation principle. Some results are as follows: The soil water potential along the slope was substantially higher at foot slope in the dry season and lower in the rainy season than at upper slope,because of different texture at different slope position. It is same for soil water storage of 150 cm and budget. The plot experiment data demonstrated that the runoff depth of 10 mm rainfall is 0.596 mm and 0.585 mm at upper slope and foot slope in dry season, and it's 0.429 mm and 0.488 mm. The results provide theoretical basis for water-saving irrigation,soil moisture real-time control and nutrient transport analysis.