中文摘要：

以松嫩平原苏打盐渍土为对象,研究了不同植被条件下松嫩平原苏打盐渍土土壤容重、入渗速率变化及它们之间的差异。结果表明,不同植被条件下土壤容重差异显著,在采样深度0-20 cm及20 cm-40 cm范围内,芦苇条件下苏打盐渍土土壤容重值最高,且随着采样深度增加而增加;羊草条件下苏打盐渍土土壤容重值最小,且随着采样深度增加而减小。植被覆盖可以增加苏打盐渍土土壤水分入渗速率。入渗速率拟合的方程与实测值在时间为110 min内时基本吻合。图1,表4,参32。

英文摘要：

Soil bulk density and water infiltration rate were determined under different plant communities in saline -sodic soils in the Songnen Plain.The bulk density measurements showed that there was a significant difference among different vegetation covers .The lar-gest soil bulk density was found under Phragmites australis（ Cav.） Trin.ex Steud.and was increased with the increase of sampling depth in soil.On the contrast,the lowest soil bulk density was observed under Leymus chinensis,which was decreased with the increase of sam-pling depth in soil.The result of water infiltration rate indicated that vegetation covers could increase water infiltration rate .The esti-mates of water infiltration rate showed a consistent agreement with the actual measured values from 0 minute to 110 minutes.