干旱北方红土是浅山地带或半浅山地带的气候干燥、降雨量少、地表蒸发量大的情况下,于第三纪红土上发育的土壤。风化厚度往往不足一米,土壤最大的特征是干时龟裂,湿时泥泞,土质干燥坚硬,渗水性差,植物适应性也差,全剖面质地为粘土,碎块状或大块状结构。水土流失特别严重,青海湟 The arid northern red soil is a soil developed on Tertiary laterite in dry climate, dry rainfall and less surface evaporation under the condition of shallow mountain or semi-shallow mountain. The weathering thickness is often less than one meter. The biggest feature of the soil is cracking when dry, muddy when wet, hard and dry soil, poor water permeability, poor plant adaptability, and the whole cross-section texture is clay, crumb or bulky structure. Soil erosion is particularly serious, Qinghai 湟