黄土高原水蚀风蚀交错带受水力和风力两相侵蚀的耦合作用，土壤侵蚀极其强烈。目前对该区域的土壤水蚀规律已有较深刻的认识，但对风蚀规律的研究，由于受到研究方法的限制而明显不足。本项目利用Be-7在土壤表层垂直分布变化明显，对土壤侵蚀和沉积敏感性高的特点，基于已有的研究成果，在典型区域采用建立风蚀观测小区、野外调查、遥感与地理信息系统相结合的方法，弄清研究区风蚀期土壤的Be-7背景值及其剖面分布特征；阐明不同坡度坡面土壤风蚀量与坡度的关系；估算坡耕地在裸露和留茬条件下的风蚀速率，揭示坡面风蚀速率的空间分布特征及其主要影响因素；分析斑块状植被的坡面分布与土壤风蚀强度的空间关系。通过对上述规律的研究，为黄土高原水蚀风蚀交错带土壤风蚀估算模型的建立，土壤侵蚀监测、防治及风水复合侵蚀机理的深化奠定理论基础。

Soil erosion is strong in the Wind-Water Erosion Crisscross Region of the Loess Plateau due to the combined action of water and wind. Most research focused on soil water erosion in this region so far, while that on wind erosion was very limited, which may be caused by without suitable techniques and methods. This study will choose beryllium-7 as a tracer, use erosion plots, field investigation, remote-sensing image and GIS analyzing, to study the pattern of soil wind erosion in the Wind-Water Erosion Crisscross Region of the Loess Plateau. Beryllium-7, whose content decreases obviously with the increasing of soil depth, is selected since it has high sensitivity to soil erosion or sedimentation. Based on research results of soil wind erosion, this project will clarify the background value of Be-7, and its distribution in the soil profile during the windy months; study the wind erosion at different slope gradient; estimate wind erosion rate for farmland at the conditions of standing crop residue kept and bare surface left; show the distribution of wind erosion rate on different positions of a loess hill, and analyze main influence factors; state impacts of vegetation distribution to wind erosion on loess hill slope with the cross distribution of vegetation and bare soil surface, and discuss interrelations of their distribution. This project provides a theoretical basis for further study of the development of wind erosion estimation model, soil erosion monitoring and control, and wind-water erosion mechanism in the Wind-Water Erosion Crisscross Region of the Loess Plateau.