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对不同种植方式下0～4m土层硝态氮(NO~-_3-N)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,其差异是由于施肥方式、灌水量和作物吸收程度的不同所致。
The comparative study on the accumulation status of nitrate nitrogen (NO ~ -_3-N) in 0 ~ 4m soil layer under different planting patterns showed that NO ~ -_3-N was rapidly rinsed into the soil below 2m after the grain variety was changed into vegetables; The cumulative amount of NO ~ -_3-N leached into the lower layer increased with the time of planting, and about 41% ~ 50% of NO ~ -_3-N accumulated in 2 ~ 4m soil layer and 95% % NO ~ -_3-N accumulated in 0 ~ 2m soil layer, the difference is due to the different fertilization methods, irrigation amount and the degree of crop absorption.