一 、前言 果树从土壤中吸收无机态的硝态氮与铵态氮 ,主要通过根系的“氮素同化”作用合成简单的有机氯化合——氨基酸与酰胺,向地上部输送与叶片“光合作用”合成的碳架结合形成各种蛋白质,因而氨基酸的种类与数量直接影响到器官的分化与建造、产量与质量、果树氮素代谢等一? I. INTRODUCTION Fruit trees absorb inorganic nitrate and ammonium nitrogen from the soil and synthesize simple organo-chlorinated amino acids and amides mainly through the “nitrogen assimilation” effect of the root system, and transport photosynthesis "The synthesis of carbon frames combine to form a variety of proteins, and therefore the type and number of amino acids directly affect the differentiation and construction of organs, yield and quality, fruit nitrogen metabolism, etc.?