【摘要】 <正> 被子植物中非豆科固氮树木的根瘤称之为赤杨型根瘤。不论豆科根瘤或赤杨型根瘤,一经离体,其回氮活力便迅速下降。因此,当用离体根瘤作为固氮活力的测试材料时,要求根瘤一经割下便立即进行测定,否则会显著影响测定结果。根据许多人的研究,根瘤的固氮活力与光合产物的供应水平有密切关系。因此,更多还原

【Abstract】 The dynamic process of the nitrogen fixation activities of detached nodules of Alnus sibi-rica,Elaeagnus angustifolia,E.mollis and Hippopha(?) rhamnoides was investigated.The resultsindicated that the activities of the detached nodules gathered in cloud day decreased morerapidly than that of the nodules gathered in fine day.It showed that the photosyntheticproduct supply may be one of the important factors influencing the nitrogen fixationactivities of detached nodules.Therefore,the reaction culture of the testing nodules mustbe done within one hour after they were detached in cloud day and within three hours infine day as the acetylene reduction activity was determined with the detached nodules.更多还原