Larcher Walter, Siegwolf Rolf
Institut für Botanik der Universität Innsbruck, Sternwartestr. 15, A-6020, Innsbruck, Austria.
Oecologia. 1985 Sep;67(2):298-300. doi: 10.1007/BF00384304.
Acute winter frost drought in Rhododendron ferrugineum at the alpine timberline was provoked by removing the snow that had covered the shrubs and by irradiating and rewarming the twigs in situ in a climatized chamber simulating snow melt conditions. Water potential decreased to -2.3 MPa within three days. After activation of photosynthesis on the 1st day, the COr-uptake decreased during the 2nd day and approached zero at the 3rd day. With advanced desiccation, the internal COr concentration of the leaves increased indicating an impairment of chloroplast functions. The procedure of the disturbances appears to be similar to that of other acute drought events.
通过移除覆盖在高山杜鹃灌木上的积雪，并在模拟融雪条件的气候箱中对小枝进行原位照射和复温，引发了高山林线处高山杜鹃的急性冬季冻旱。三天内水势降至-2.3兆帕。在第一天光合作用激活后，第二天二氧化碳吸收量下降，第三天接近零。随着干燥加剧，叶片内部二氧化碳浓度增加，表明叶绿体功能受损。这种干扰过程似乎与其他急性干旱事件相似。
