Norby Richard J, Sigal Lorene L
Environmental Sciences Division, Oak Ridge National Laboratory, 37831-6034, Oak Ridge, TN, USA.
Oecologia. 1989 Jun;79(4):566-568. doi: 10.1007/BF00378677.
Thalli of Lobaria pulmonaria (L.) Hoffm., a nitrogen-fixing epiphyte common in mesic temperate forests, were collected in a Douglas-fir (Pseudotsuga menziesii Franco) forest near Corvallis, Oregon, and maintained for 20 to 40 days in controlled-environment chambers with atmospheric CO concentrations of 374 and 700 μll. Nitrogenase activity, which was assayed by the acetylene reduction method, was approximately doubled in the lichen maintained in elevated CO. Increases in nitrogen fixation by lichens may be an important part of the integrated ecosystem response to rising CO.
肺衣（Lobaria pulmonaria (L.) Hoffm.）是一种常见于温带湿润森林中的固氮附生植物，其叶状体采自俄勒冈州科瓦利斯附近的一片花旗松（Pseudotsuga menziesii Franco）林，并在可控环境箱中保持20至40天，箱内大气CO浓度分别为374和700 μll。通过乙炔还原法测定的固氮酶活性，在CO浓度升高环境下培养的地衣中大约增加了一倍。地衣固氮作用的增强可能是生态系统对CO升高综合响应的一个重要部分。
