中文摘要：

为掌握切沟对土壤水分时空变异的影响,选取水蚀风蚀交错区两个典型切沟样点为研究对象。采用时间序列分析和经典统计学方法,从土壤水分时间变化特征和空间分布格局两方面探讨。结果表明：距沟道不同距离下土壤储水量差异明显。300 cm处样点可作为测定尺度下土壤储水量平均值。土壤水分在垂直方向上的变异受植被特征影响,沟道影响较小。坡面土壤储水量的空间分布呈现不同的分布格局。坡顶风速大,土壤水分蒸发快,坡中处土壤储水量最高,为949.9 mm,距切沟越近土壤水分快速散失,坡下土壤水分接近4%,亏缺严重。杏树地土壤储水量远高于柠条地,柠条地土壤储水量分布较为单一。土壤蒸发、植被、沟道等因素使得坡面土壤水分分布更加复杂。

英文摘要：

Gullies are pervasive topographic features on the Loess Plateau. We selected two typical gullies in the water-wind erosion region of the plateau to study the effect of gullies on the spatiotemporal variability of soil-water. The distribution and variation of soil-water storage were evaluated using time-series analysis and classical statistical methods. Soil-water storage varied with distance to the gully borders. The spatial average soil-water in the study sites was300 cm from the border. soil-water in the vertical direction was mostly dependent on the vegetation,and the gullies had little impact. The spatial distribution of soil-water at a slope scale presented different patterns. Strong upland winds increased the evaporation of soil-water,which rapidly dissipated. Soil-water storage at mid-slope near the gullies was as high as 949. 9 mm. The bottom of the slopes had soil-water deficits of 4%. Soil-water storage was much higher in an apricot orchard than in shrubland dominated by Caragana korshinskii Kom. Soil evaporation,vegetation type,and the gullies increased the complexity of the pattern of soil-water.