中文摘要：

以河龙区间42个流域为对象，在流域地貌格局信息提取和侵蚀产沙过程特征指标计算及其相互关系分析的基础上，探讨地貌格局对流域侵蚀产沙过程的影响。结果表明：①在河道系统水平，河流数量、长度等几何特征指标和河流分叉率（Rb12）、分级率（Rd32）、相邻级别间的河流长度比等形状特征指标与流域侵蚀模数显著相关；②在流域系统水平，坡度粗糙度、相对高差、圆度比、高长比是影响流域侵蚀产沙过程的主要指标，其中坡度粗糙度是最根本的解释变量；③各地貌格局因子间相互作用复杂，且对侵蚀过程的影响要强于泥沙输移过程，其通径分析模型对流域侵蚀模数、输沙模数和泥沙输移比变化的解释度分别为65％、33％和20％。这对正确认识影响流域侵蚀产沙过程的格局因素和建立准确的过程模型，具有重要参考价值。

英文摘要：

The patterns of topography and landform, defined as basic landscape elements in watershed, have important inpacts on soil erosion processes. In this paper, the watersheds based on 42 hydrological stations, located within the region from Hekouzhen to Longmen （Helong section） in the middle reaches of the Yellow River, were selected as the study area, and the relationship between watershed topography and erosion-sediment processes was analyzed by the correlation and path analysis based on acquisition of topographic features and estimation of soil erosion and sediment yield. The results showed that the number and length of streams and its total number at a given level were the main factors affecting the intensity of soil erosion, and the stream-length ratio, the ratio of bifurcation and stream order have a close relationship with the soil erosion modulus at the river channel level. However, at watershed level, slope roughness （Sp）, watershed relative height difference （Rp）, roundness ratio （Rc） and watershed valley length ratio （Rh） are the main topographical landscape indices that affect the spatial variation of soil and water loss, among them, slope roughness is the most fundamental and most important explanatory variable of all topographical landscape indices. The complex interaction among the indicators directly or indirectly affects the process or soil erosion and sediment yield. The path analysis model constructed with topographical factors could explain 65% of the variation for soil erosion modulus （EM）, 33% of the variation for sediment transport modulus （SM）, and 20% of the variation for sediment delivery ratio. These analysis and computation results are helpful to get a better understanding of the importance of topographic patterns and to build more accurate soil erosion process models.