Leaf canopy display, stomatal conductance, and photosynthesis in seedlings of three tropical pioneer tree species subjected to drought
Leaf canopy display, stomatal conductance, and photosynthesis in seedlings of three tropical pioneer tree species subjected to drought
复制标题
遭受干旱的三种热带先锋树种幼苗的叶冠展示、气孔导度和光合作用
作者：
E. Reekie;P. Wayne
Reekie，E。G。和Wayne。 P. 1992。叶冠层显示，气孔电导。 THRCC热带先驱树种种幼苗中的光合作用，属于干旱。能。 J. Bot。 70：2334-2338。在低地热带雨林的先驱物种，受控的干旱循环受控，具有气动电导率和净光合物的净光合作用，以确定物种反应，对吹笛者的幼苗，cecropia otusifolio和trichosperrrl〜ctt〜rt〜rt〜rt〜rt〜exiCat〜exiCat〜exiCat〜exiCat〜tt〜进行受控的干旱循环。还测量了土壤水分对冠层显示的影响以及对湿度，光和温度波动的构成电导的响应。吹笛者和盲肠中的留置电导和光合作用与土壤水分没有关系，直到下降到约20％。在较高的土壤水分下，吹笛者和盲肠中的气孔电导与相对湿度呈正相关。相比之下，三通型的气孔电导和光合作用显示与相对湿度没有关系，并且随着土壤水分的减少而逐渐下降。在干旱周期结束时，所有三个物种中的冠层显示出急剧下降。树冠结构中物种之间存在明显差异。吹笛者和盲肠都有大叶，茎中的纤维含量低。叶柄和叶子，而三角叶trapenn〜rtr〜的叶子较小，纤维含量更高。此外，吹笛者的叶与茎比高于trichospertn〜rtn。在响应气孔电导和光合作用对环境因素的物种中，可能反映了在吹笛者和剖腹产中保持相对较高的turg骨压力的必要性。
REEKIE, E. G., and WAYNE. P. 1992. Leaf canopy display, stomatal conductance. and photosynthcsis in seedlings of thrcc tropical pioneer tree species subjcctcd to drought. Can. J. Bot. 70: 2334-2338. Seedlings of Piper aurtiturn, Cecropia obtusifolio, and Trichosperrrl~ctt~ rt~exicat~utt~, pioneer species of lowland tropical rainforests, were subjected to controlled drought cycles, with stomatal conductance and net photosynthesis monitored to determine species response. The affect of soil moisture on canopy display and the response of stornatal conductance to fluctuations in humidity, light, and temperature were also measured. Stornatal conductance and photosynthesis in Piper and Cecropia showed no relationship with soil moisture until it declined to approximately 20%. At higher soil moistures, stomatal conductance in Piper and Cecropia was positively correlated with relative humidity. In contrast, Tricl~ospentnttt~ stomatal conductance and photosynthesis showed no relationship with relative humidity and declined gradually as soil moisture decreased. Canopy display in all three species showed a sharp decline at the end of the drought cycle. There were marked differences among species in canopy structure. Piper and Cecropia both have large leaves and a low fibre content in stems. petioles, and leaves, whereas Tricllospenn~rtr~ has much smaller leaves and a higher fibre content. In addition, Piper has a higher leaf to stem ratio than Trichospertn~rtn. among species in response of stomatal conductance and photosynthcsis to environmental factors may reflect the need to maintain a relatively high turgor pressure in Piper and Cecropia for canopy display.