东北赤杨(Alnus mandshurica)和毛赤杨(A. sibirica var. hirsuta)广泛分布于我国东北林区,它不仅能适应山地高寒气候和贫瘠土壤条件,而且具有较强的结瘤固氮能力。许多研究表明,赤杨的固氮能力与温度条件关系极大。本研究试图从固氮酶活性与根瘤碳消耗的变化,来探讨两种赤杨在不同温度条件下的固氮效能。 Alnus mandshurica and A. sibirica var. Hirsuta are widely distributed in the northeastern China forest area. They not only adapt to the alpine climate and poor soil conditions, but also have strong nodulation and nitrogen fixation ability. Many studies have shown that the ability of nitrogen fixation of alder is greatly related to temperature. In this study, we tried to explore the nitrogen fixation efficiency of two species of Alnus cremastogyne at different temperatures from the changes of nitrogenase activity and nodule carbon consumption.