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 equationθ=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.
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