设施条件下减量施氮对土壤硝态氮含量时空变化的影响

Effect of Reducing Nitrogen Fertilizer on Temporal and Spatial Variation of Soil Nitrate in Greenhouse

以辣椒品种＂美园＂为试材,通过田间试验和室内化验分析相结合的方法,研究了设施条件下不同处理（常规施肥、减氮15%、减氮30%、减氮45%、不施氮肥）对土壤硝态氮含量的影响。结果表明：随着土层深度的增加,土壤硝态氮含量逐渐降低,土壤0-40cm土层硝态氮含量波动较大,40-100cm土层硝态氮含量波动较小;随着氮肥施用量的减少,土壤硝态氮含量逐渐降低,减量施肥较常规施肥在不同土层深度土壤硝态氮含量波动小。随着采样日期的增加,土壤硝态氮含量在最终达到最小值,但是土壤硝态氮含量与采样日期不呈线性关系,0-40cm土层硝态氮含量波动较大,40-100cm土层硝态氮含量波动较小。

Taking pepper‘Meiyuan＇as test material,through the combination of field experiment and indoor laboratory analysis methods,the effect of reducing nitrogen fertilizer（conventional fertilizer,reducing nitrogen 15%,30%,45%,and no nitrogen）on temporal and spatial variation of soil nitrate in greenhouse were studied.The results showed that with the increase of soil depth,soil nitrate content decreased gradually,in soil layer 0-40 cm soil nitrate content waved significantly,40-100 cm waved insignificantly;with the reduction of nitrogen fertilizer,soil nitrate content decreased gradually,nitrate content of reducing fertilizer had smaller fluctuations than conventional soil fertilization in different soil depth.With the increase of the sampling date,soil nitrate content reached the minimum in the final,but the soil nitrate content and the sampling date were not linear relationship,in soil layer 0-40 cm soil nitrate content waved significantly,40-100 cm waved insignificantly.