等高绿篱模式下红壤丘岗区浅沟坡面土壤水分时空分布

等高绿篱技术被认为是防治浅沟侵蚀的一种有效措施，然而，绿篱拦挡下浅沟坡面土壤水分的变化特征还不是很清楚。利用定位观测数据，探讨了绿篱拦挡下浅沟坡面土壤水分的时空变化。结果表明:在浅沟存在的坡面上，等高种植香根草显著影响了土壤水分时空分布特征。0-45cm土层土壤含水量垂直变化，香根草小区和裸地小区在雨季均呈逐渐减小趋势，在旱季呈逐渐增大趋势，且香根草小区各层土壤水分变异程度大于裸地；浅沟坡面土壤水分从坡顶向下，香根草小区变化总趋势是先减小后增大或持平，裸地小区呈先增大后减小再增大趋势；香根草种植增大了土壤水分沿坡面横向的变异度，但纵向坡位的影响仍较横向明显。

Impact of Contour Hedgerow on Spatial and Temporal Variation of Soil Moisture in the Slopeland with Ephemeral Gully in Hilly Red Soil Region

It is very meaningful to understand the effect of contour hedgerow intercropping and ephemeral gully on spatial and temporal distribution of slopeland soil moisture in hilly red soil region.Soil water content of a depth of 45 cm at 15cm intervals along with soil and water losses were analyzed and the reasons for these changes were discussed based on soil water content measurement from late May to early November in 2007.The results showed that,soil moisture of 3 soil layers are gradually decreased during the rainy season,soil moisture along the vertical gradually increased during the dry season,and the mean variation of soil moisture in control treatment is weaker than that of Vetiver (Vetiveria zizanioides) treatment.For Vetiver treatment,soil water contents decrease at beginning,then increase or keep flat from its top to the bottom along longitudinal direction; for control treatment,soil water contents increase at beginning then decrease until keep increase.Vetiver increased variability of soil moisture along horizontal direction to agreat extent,but longitudinal direction still has more influence on soil moisture than horizontal direction.