青紫泥是上海郊区主要的水稻土类型之一,约占总面积的10—15%。这类土壤的特点是:地势比较低洼,地下水位较高,养分含量较丰富,但供肥强度较弱,以致在生产实践中常使用过量的氮肥。因此研究这类土壤的氮素矿化,预测它的供氮量,为合理施肥提供 Purple purplish ash is a suburb of Shanghai, one of the major types of paddy soil, accounting for about 10-15% of the total area. The characteristics of such soils are: low lying terrain, high groundwater level, rich nutrient content, but weak supply of fertilizers so that excess nitrogen fertilizer is often used in production practice. Therefore, the study of nitrogen mineralization in such soil, to predict its supply of nitrogen, to provide reasonable fertilization