【摘要】 试验表明,甜菜对氮素吸收速度和运输系数均在叶丛快速生长期前为高,以后明显递减.氮代谢以幼苗期最强,糖分积累期最弱。幼苗叶片中谷氨酸,叶柄中精氨酸含量高。生育后期。氮代谢差异主要表现在谷氨酸和色氨酸上,并对糖分影响明显。谷氨酸可能用于衡量氮营养水平。氮代谢到8月中旬仍不减弱,导致单糖上升,蔗糖下降。叶柄是单糖的贮存库。幼苗各部位糖分均低,叶丛快速生长期糖分明显上升。叶丛中单糖含量波动较大,蔗糖较稳定.更多还原

【Abstract】 The trial results shown that the uptake speed and transported index to nitrogen were high in the early of foliage rapid growlh stage in sugar beet, and it decreased progressively afterward. The nitrogen metabolism was very high in seedling stage, and very low in the sugar content accumulated stage. The glutamic acid was high in the leaf blads of seedling and arginine was also high in the petiole. In the later of growing stage, the main differences of N metabolism were at glutamic acid a d rytophane, and had slg f cantly inf’uence to sugar beet content. The glutam c acid was used to the balance of N nutrient possible’y, the N metabol sm could not deer and. un il m dd e f August and it caused the monose to increase, a d cro e deer ased.The monose was stored in the petiole. Sugar content were low in the parts of seedlings, and it could increase significantly in the foliage rapid growth stage. The monose content were stronger fluctuation and sucrose were stably in the crown.更多还原