Early-fruiting walnut (Juglans regia L. ) cultivar ' zhonglin 1' was used as the materials to study the effects of three different nitrogen fertilizers with three levels(350, 700, 1 050 g pure nitrogen each plant) on leaf photosynthetic metabolism and fruit quality. The results showed that; 1) middle -N NH4+ - N treatment (700 g N each plant) sustained a high chlorophyll content level in the whole growth period of early-fruiting walnut trees; 2) compared to urea and NO3~ - N, NH4+ - N fertilizer had a better effect on the photosynthetic characteristics of early-fruiting walnut, and high-N NH4+ - N treatment (1 050 g N each plant) was the best treatment on it; 3) NO3 - N fertilizer and urea increased the walnut yield significantly; 4) NH4+ - N fertilizer improved the kernel ratio of walnut nuts; 5) nuts fat ratio increased with the increasing of nitrogen fertilizer quantity.%以早实核桃‘中林1号’为试验材料,探讨了不同形态的氮素在350,700,1 050 g·株-1纯氮水平下对早实核桃叶片光合特性和果实品质的影响.结果表明:1)700 g·株-1铵态氮处理对提高早实核桃生长季节叶片叶绿素含量的作用最好；2)铵态氮肥对早实核桃光合作用的影响优于尿素和硝态氮,1 050 g·株-1铵态氮处理效果最优；3)硝态氮肥和尿素可明显提升核桃产量；4)铵态氮肥可提高核桃干果出仁率；5)增施氮肥可提高核桃粗脂肪含量.
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