Welker J M, Rykiel E J, Briske D D, Goeschl J D
Department of Range Science, Texas A&M University, 77843, College Station, TX, USA.
Biosystems Research Division, Department of Industrial Engineering, Texas A&M University, 77843, College Station, TX, USA.
Oecologia. 1985 Sep;67(2):209-212. doi: 10.1007/BF00384285.
Carbon allocation among bunchgrass tillers was examined with carbon-11 (CO) steady state labelling. Labelled carbon was continuously transported from parent tillers to anatomically attached daughter tillers at a time when morphological characteristics indicated that tiller maturation had occurred. Steady state levels of import into monitored daughter tillers increased within 30 min of either defoliation or shading. Import levels decreased within 30 min of the removal of shading, but remained accelerated throughout an 84 h observation period following defoliation. A second defoliation further increased carbon import into a monitored tiller above the previously accelerated level resulting from the initial defoliation. Carbon import by vegetative tillers in the two bunchgrass species examined may be most appropriately viewed as a series of potentially accelerated import levels above a low level of continuous import.
通过碳-11（CO）稳态标记研究了丛生禾本科植物分蘖间的碳分配。当形态特征表明分蘖成熟时，标记的碳持续从母分蘖运输到解剖学上相连的子分蘖。在去叶或遮光后的30分钟内，监测到的子分蘖的稳态输入水平增加。去除遮光后30分钟内输入水平下降，但在去叶后的84小时观察期内仍保持加速状态。第二次去叶进一步增加了碳输入到监测分蘖中的量，使其高于初始去叶所导致的先前加速水平。在所研究的两种丛生禾本科植物中，营养分蘖的碳输入最适合被视为一系列高于低水平持续输入的潜在加速输入水平。
