Physiological aspects of the ecology of Dicranum fuscescens in the subarctic. I. Acclimation and acclimation potential of CO2 exchange in relation to habitat, light, and temperature
Physiological aspects of the ecology of Dicranum fuscescens in the subarctic. I. Acclimation and acclimation potential of CO2 exchange in relation to habitat, light, and temperature
复制标题
亚北极地区 Dicranum fuscescens 生态学的生理方面。
DOI：
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发表时间：
1976
期刊：
影响因子：
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通讯作者：
W. Oechel
中科院分区：
文献类型：
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作者：
P. Hicklenton;W. Oechel
1974年夏天，在魁北克的Schenville（纬度55° N）对Dicranum fuscescens Turn的净二氧化碳交换与光照和温度的关系进行了实验室测量。使用开放式红外气体分析系统测量净CO2交换。苔藓样品收集从两个现场（一个低地地衣林地和高地的Lithundra地区）实验前立即。两个地点的植物光合作用的最适温度表现出在季节中期对较高温度的适应。在7月初测得的光合作用最大速率在高地植物中为2.1 mg CO2/g干重−1·h−1，在低地地衣林地中为0.74 mg CO2/g干重−1·h−1。 暗呼吸速率没有表现出季节性的温度适应。在最佳温度下光合作用饱和所需的辐射水平从赛季初到赛季中期从两个人口的样本显示出增加。A reve.
Laboratory measurements of net carbon dioxide exchange in relation to light and temperature were made on Dicranum fuscescens Turn, at Schefferville, Quebec (latitude 55° N), during the summer of 1974. Net CO2 exchange was measured using an open-flow infrared gas analysis system. Moss samples were collected from two field sites (a lowland lichen woodland and highland semitundra region) immediately before the experiments. Temperature optima for photosynthesis in plants from both sites showed acclimation to higher temperatures in the middle of the season. Measured maximum rates of photosynthesis, attained in early July, equalled 2.1 mg CO2∙g dry weight−1∙h−1 in plants from the highland site and 0.74 mg CO2∙g dry weight−1∙h−1 in those from the lowland lichen woodland. Dark respiration rates showed no seasonal temperature acclimation. Radiation levels required for saturation of photosynthesis at optimum temperatures showed an increase from early season through midseason in samples from both populations. A reve...