武威市山地旱作土壤资源的评价

Assessment of Soil Resources in the Hilly Rainfed Region of Wuwei County

本文经过土壤调查、土壤理化性质的测定及数字整理,总结出武威市山地旱作土壤土层深厚,潜在肥力较高,土体结构较好。存在的主要问题是:干旱缺水,烧草皮,踏灰,陡坡处开荒破坏了植被,导致了水土流失严重,供肥性能差,速效氮偏低,速效磷缺乏。根据以上特征,制定旱作土壤(耕层)三级肥力指标,为旱作土壤改土和培肥提供了科学依据。

Through investigating the soil resources and determining the physical and chemical properties of the soil, the authors considered that the main characteristics of the soil in this region were as follows, deeper thickness, higher potential fertility and better siolstructure; the main problems existed consisted of dry weather, lacking of water, serious soil erosion, bad ability of fertilizer supply, low amount of quick-acting P_2O_5. According to the results as above, the authors worked out a three-grade fertility index for dryland soil so as to provide the scientific basis in improving the soil fertility in this region.