【摘要】 对土娄土不同层次的几个水分物理常数及持水曲线进行了测定 ,依据其在不同层次的垂直变化 ,对其相互之间的相关性进行了分析。结果表明 :①田间持水量在 2 10 .5～ 2 2 6 .9g·kg- 1之间 ,近似一个常数。田间持水量与无效水含量 (萎焉系数 )成显著正相关 ,与物理性粘粒含量之间并无明显相关 ;②容重除表层 (0～ 10cm)为 1.0 1g·cm- 3外 ,其余各层在 1.30～ 1.4 9g·cm- 3之间 ,各层次有较大偏差。容重与重力水、全有效水、速效水、迟效水含量以及低吸力段 (小于 10 0kPa)下的比水容量值之间成显著或极显著负相关。③物理粘粒含量在 4 30 .0～ 586 .6 g·kg- 1之间 ,各层次差异较大。物理粘粒含量与重力水、全有效水含量成显著负相关、与无效水含量 (萎焉系数 )成显著正相关 ,与容重之间并无明显相关。④水分特征曲线以经验方程θ=AS-B 拟合效果最佳 ;土壤各层次水分特征曲线、比水容量曲线差别不大。⑤无效水含量 (萎焉系数 )以 150 0kPa吸力下的含水量来等效 ,略有偏高 ,以 180 0kPa为宜更多还原

【Abstract】 Moisture physical constants and moisture retention curve of different layers of Lou soil were determined. According to vertical change, the correlation of them was analysed. Results showed that:①Field capacity approximates a constant (210.5～226.9 g·kg -1 ). It has direct correlation with wilting coefficient.②Bulk density among other layers are obviously different (1.30～1.49 g·cm -3 ) except that of the surface layer (0～10 cm)(1.01 g·cm -3 ).It negatively correlates with gravitational water, complete effective moisture, readily available water and moisture capacity of low suction section (<100 kPa). ③Physical clay contents are obviously different (430.0～586.6 g·kg -1 )among different layers. It has correlation with gravi tational water, complete effective moisture content and wilting coefficient.④The effect of moisture character curve imitating equationθ=AS -B  is best. It is not different from moisture capacity curve.⑤The effect of moisture content (1800 kPa) standing for wilting coefficient is better.更多还原