粮田改种蔬菜后土壤剖面硝态氮的动态变化

Changes of Nitrate-N Accumulated in soil profile after changing grain crop land into vegetables land

摘要: 对不同种植方式下0～4m土层硝态氮累积状况的比较研究表明，粮田改种蔬菜后NO^-₃-N被迅速淋洗到2m以下土层；淋洗到下层的NO^-₃-N 累积量随种菜时间的延长而不断增加；蔬菜地约41％～50％的NO^-₃-N累积在2～4m土层，粮田约95％NO^-₃-N累积在0～2m土层,其差异为不同施肥方式、灌水和作物吸收等因素所致。

Abstract: Soil nitrate-N was rapidly leached below 2 meters after changing grain crop land into vegetable land. Because of difference in fertilization, irrigation, plant uptake and so on, about 41%～50% of soil nitrate-N accumulated in a depth of 2～4m layer in vegetable land, and 95% of that was found in 0～2m layer in grain crop land.