关键词: 四川盆地, 冲积土, 土壤微量元素, 黄壤, 化学地理, 土壤有效, 酸性紫色土, 有效态锌, 有效态硼, 中性紫色土

Abstract: Soil samples analyzed in this article were collected from over 600 sites in 102 counties in Sichuan Basin.The average total Zn, B, Cu, Mn in the soil of Sichuan Basin are 108, 80.7, 33 and 641 ppm respectively. The average available Zn, B, Cu, Fe and Mn contents are 1.45, 0.23, 2.53, 61.1 and 228 ppm respectively. The available Zn, Cu, Fe and Mn contents of the paddy field are usually higher than that of the dry farming fields.The available B content of the soil in Sichuan Basin is low. Most of the soils in the Sichuan Basin are considered to be B deficient soils. It is necessary to apply B fertilizer to the most of the soils in Sichuan Basin.The available Zn contents of the various soil types in Sichuan Basin are quite different. Calcareous purplish soil has the lowest available Zn content and is considered as the Zn de-ficient soil. The available Zn content of Minjiang River alluvial soil, the Fujiang River alluvial soil, neutral purplish soil, acidic purplish soil and yellow soil occuding on old alluvial loess are lower and a part of these soil are considered to be Zn deficient soils. It is necessary to apply Zn fertilizer to these soil.The available Cu, Fe, Mn contents in the soils of Sichuan Basin are richer.