中文摘要：

为了研究不同地貌部位（峁坡、沟坡、峁顶）和不同坡向（阴坡、阳坡、半阴坡、半阳坡）对土壤有机碳分布的影响,以陕北黄土高原为研究对象,在考虑不同地貌部位和坡向的基础上,选取样点49个,按0～10 cm,10～20 cm,20～30 cm,30～40 cm分层采集样品。结果表明,土壤有机碳的均值为13.2 g/kg;不同地貌部位土壤有机碳分布主要受降雨径流以及植物根系的影响;不同坡向土壤有机碳含量均值的大小顺序为：阴坡〉半阴坡〉半阳坡〉阳坡;相同地貌部位,阳坡,阴坡、半阴坡、半阳坡均发生向下的淋溶迁移;相同坡向,峁坡和沟坡土壤有机碳剖面分布基本一致。

英文摘要：

In order to discuss the influence on distribution of soil organic carbonic by different topography positions （mound slope, gully slope, hilltop） and different slope aspects （sunny slope, shaded slope, half-shaded slope and half-sunny slope）, taking Loess Plateau in Northern Shaanxi as the subjects, on the basis of different topography positions and slope aspects, 49 samples points are selected to collect samples by 0 - 10 cm, 10 - 20 cm, 20 - 30 cm, 30 -40 cm layer. The results show that the mean value of soil organic carbon is 13.23 g/kg; the distribution of soil organic carbon in different topography positions is mainly affected by rainfall runoff and plant roots; and the sequence for the content of soil organic carbon in different slope aspects area is： shaded slope 〉 half-shaded slope 〉 half-sunny slope 〉 sunny slope; the sunny, shaded, half-shaded and half-sunny slopes all appear to have leaching movement downwards in the same topography positions; and the profile distribution of organic carbon in soil on the mound and gully slopes is mainly in consistency.