中文摘要：

采用PVC管原位培养连续取样法测定延边地区生长季节内3种施肥方式（化肥、化肥与有机肥配施、有机肥）下的稻田土壤氮素矿化、硝化的时间动态及氮素矿化的空间分布格局。结果表明：3种稻田土壤氮素矿化存在明显的时空变异性。稻田土壤在8月份表现出强烈的氮矿化过程,而在7～8月份硝化作用较强。3种施肥方式稻田上层土壤（0～10 cm）的氮净矿（硝）化率显著高于下层（10～20 cm）土壤。3种稻田土壤的氨化过程在氮矿化过程中占有重要地位,其上层土壤NH4^＋-N在无机氮中的比例分别为58.1%～94.4%（CF）、36.9%～93.8%（CF＋OF）、23.3%～93.5%（OF）。施用有机肥有利于促进土壤的氮矿化过程。

英文摘要：

Tempo-spatial variations in soil net nitrogen（N） mineralization and nitrification of Yanbian growing season paddy with three fertilization methods（chemical fertilizer, chemical and organic fertilizer, organic fertilizer）were investigated with a PVC tube sequential coring and in-situ incubation method. The results showed that there was obvious spatial and temporal variability in three paddy soil nitrogen mineralization. Paddy soil in August showed a strong nitrogen mineralization, and had a strong nitrification in July to August. Nitrogen net mineralization rate（nitrification rate） in the upper soil（0～10 cm） was significantly higher than those of the lower（10～20cm） soil of three kinds of paddy ecosystem. Ammoniated process of three paddy soil occupied an important position in nitrogen mineralization process, its NH4^＋-N ratio of inorganic nitrogen in the upper soil（0～10 cm） were 58.1%～94.4%（CF）,36.9%～93.8%（CF＋OF）, 23.3%～93.5%（OF）. The results indicated that Organic manure treatment had advantages for soil nitrogen mineralization.