中文摘要：

在2007年5月到2008年1月期间，供试土壤为红壤及坡面坡度为150条件下，利用定位观测数据，探讨了天然降雨条件下浅沟侵蚀小区土壤水分季节变化特征，分析了降雨、土壤质地、等高绿篱、浅沟地形等四个因素对土壤水分动态变化的影响。结果表明，小区坡面0.45cm土层平均土壤水分含量季节变化规律基本与降水变化一致，降水是影响浅沟坡面土壤水分变化的主要原因；绿篱对浅沟坡面土壤水分的影响因存在季节性的差异，雨季等高绿篱措施对提高浅沟坡面0.45cm土层含水量作用显著，旱季则相反；土壤质地和浅沟微地形也是影响土壤水分变化的重要因素，但其影响都不如降雨和绿篱的影响显著，种植绿篱有利于保持坡面水分。

英文摘要：

The soil water contents in the four red-soil hillslope plots at 15 degree with artificial ephemeral gullies were monitored from late-May 2007 to early-January 2008. Seasonal variations of soil moisture and influencing factors, such as rainfall, soil texture, contour hedgerow and gully micro morphology, were analyzed and discussed. The results showed that the seasonal variations of the soil water contents of 0-45 cm m all plots responded well to the precipitation, indicating that the precipitation played the most important role in controlling the soil water content of the studied gullies. Whereas, the soil water contents in the hedgerow plots showed slightly different from others. In both the dry and rainy seasons, the average soil water content of 0-45 cm in the hedgerow plots was significantly higher than those of plots with no hedgerow. Both the soil texture and the gully micro morphology presented an important influence on the variation of soil water content in the slope surface of the ephemeral gullies. However, their effects were not statistically significant compared with the precipitation and the hedgerow. Our collective results indicated that the contour hedgerow does help to maintain the soil water in the hillslopes.