摘要： 通过在北京通州区的肥料定位试验,研究了不同施肥量对黄瓜产量、土壤硝态氮累积量及土壤水溶液硝态氮累积量的影响.结果表明,施氮量为260 kg/hm²时,达到作物最高产量,并取得最佳经济效益,从而确定该施肥量为最佳氮肥投入量;通过对不同施肥量条件下土壤NO3^-N累积量的研究,将该研究区土壤对氮肥环境容量确定为N一年260 kg/hm²;通过测定作物收获后0～90 cm土壤硝态氮累积量能够有效反映对当茬作物的施肥量水平;土壤0～90 cm水溶液N03-N浓度随着氮肥投入量的增加而增大;作物收获后0～90 cm土壤水溶液中NO3^-N含量与其土壤N03-N含量具有显著相关性;通过对0～90 cm土壤水溶液硝态氮含量的测定,能有效反映不同施肥水平对地下水的污染潜力.

关键词: 环境容量, 施肥量, 土壤硝态氮, 土壤水溶液

Abstract: The effects of different nitrogen fertilization levels on yield of cucumber, the soil nitrate2N content and the soil solution nitrate2N concentration were studied by the experiment in Tongzhou of Beijing. The results sho wed that cu2 cumber yield was highest at the N rate 260 kg/ ha, also got best gross economic returns at this N rate, it was the best N rate input. This studied evaluated the soil nitrate2N content under different nitrogen fertilization levels, the results showed that the environment capacity of the soil to N fertilizer was preliminarily determined as N 260 kg/ (ha#year).An end2of 2 season soil NO3^-2N test in the 0- 90 cm appeared tobe capable of evaluating cucumber N management practices. Nitrate N concentration in the soil solution increased as the total ofN applied to the soil.A significant relationship was found be2 tween the total mass of NO3^-2N in the 019m soil profile following harvested andthe amount ofNO3^-2N concentrations in the 019 m. It would be useful topredict the potential for nitrate(NO3^-) leaching to the drinkingwater through the amount of NO3^-2N concentrations test in the 019 m.

Key words: Environment capacity, Rate of fertilizer applied, Soil nitrate2N, Soil solution

中图分类号: 

• S143.1