植物叶片除把光合作用所产生的碳水化合物供给其他器官外,在氮的同化作用中也常起着重要作用。为了搞清叶片中氮的同化和运输问题,必须了解某些含氮化合物是如何运输到叶片中、又如何在叶片中同化并再从叶片输送到其他器官的。可是,直接的证明还不充分,这可能是与将经木质部输入的化合物与经韧皮部输出氮的化合物加以分离十分困难有关。在本研究中,为了探索某些含氮化合物在大豆叶片中的同化和运输,在结荚期,对叶柄环割植 In addition to photosynthesis of plant leaves produced by the carbohydrate supply to other organs, the nitrogen assimilation also plays an important role. In order to understand the issue of nitrogen assimilation and transport in leaves, it is important to understand how certain nitrogenous compounds are transported into the leaves, how they are assimilated in the leaves and then transported from the leaves to other organs. However, the direct proof is not sufficient, which may be related to the input of compounds from the xylem and the phloem output of nitrogen compounds is very difficult to be separated. In this study, in order to explore the assimilation and transport of some nitrogen-containing compounds in soybean leaves,