组萍速生快繁,固氮效率高。但如何正确测定红萍的固氮量?这是关系到评价红萍的利用价值问题。鉴于以往测定红萍固氮量存在问题,我们用~(15)N稀释法测定红萍固氮量时,采取选择同系的无藻萍作为红萍的参考作物,改进试验装置,采用~(15)N吸收丰度校正方法,并在不同季节进行长周期的红萍固氮量测定,以求所测的红萍年固氮量尽量接近实际水平。 Ping fast-growing group Fan, nitrogen fixation efficiency. However, how to determine the correct nitrogen fixation of Rhodiola? This is related to the evaluation of the value of the red duck. In view of the problems of determining the nitrogen fixation of Rhodiola rosea in the past, when we determined the nitrogen fixation of rhodiola by ~ (15) N dilution method, we chose algae without algae as the reference crops of Rhizoma. Absorb abundance correction method, and in different seasons long-term Rhodiola rosea nitrogen determination, in order to measure the Azinblumen annual nitrogen fixation as close to the actual level.