ALLOCATION PATTERNS IN 2 TROPICAL VINES IN RESPONSE TO INCREASED ATMOSPHERIC CO-2
ALLOCATION PATTERNS IN 2 TROPICAL VINES IN RESPONSE TO INCREASED ATMOSPHERIC CO-2
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DOI：
10.2307/2389964
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发表时间：
1992-01-01
影响因子：
5.2
通讯作者：
STRAIN, BR
中科院分区：
文献类型：
--
作者：
CONDON, MA;SASEK, TW;STRAIN, BR
1.我们的研究解决了两个问题。(a)当热带葡萄树的净初级生产力增加时，是否有一个增加的收益分配给高度的增长？(b)来自不同类型热带森林的葡萄藤的分配模式是相似的还是不同的？2.选择热带山地湿润林和热带干旱林的总状裸盖菇（Psiguria racemosa）和伞形裸盖菇（Psiguria umbrosa）两种热带森林中的同属块茎类藤本植物，在三种CO2浓度下进行实生苗培养.这两个物种的高度显着增加：总状裸盖菇的平均高度增加5.5倍，在1000 μ mol mol-1 CO2，和平均高度的Psiguria umbrosa增加7.1倍，相比，植物在350 μ mol mol-1 CO2。在总状裸盖菇中，相对于根系生长，生物量分配到地上部生长的比例从350 mumolmol-1CO 2时的55%增加到1000 mumolmol-1CO 2时的78%，而在伞状裸盖菇中分配比例保持不变.分配模式的差异可能反映了对不同生境所施加的环境限制的适应性反应。对于Psiguria umbrosa，这是落叶，往往死在旱季，分配到根生物量可能是重要的存储根组织的发展，可能会影响未来的增长和高度。
1. Our study addresses two questions. (a) When net primary productivity increases in tropical vines, is there an increasing allocation of the gains to growth in height? (b) Are allocation patterns of vines from different types of tropical forests similar or different?2. We chose congeneric tuberous vines from two types of tropical forest (Psiguria racemosa from tropical premontane moist forest and Psiguria umbrosa from tropical dry forest) and grew seedlings at three concentrations of ambient CO2 in controlled environment chambers.3. Both species increased markedly in height: average height of Psiguria racemosa increased 5.5 times at 1000 mumol mol-1 CO2, and average height of Psiguria umbrosa increased 7.1 times, compared to plants at 350 mumol mol-1 CO2. In Psiguria racemosa, biomass allocation to shoot growth relative to root growth increased from 55% at 350 mumol mol-1 CO2 to 78% at 1000 mumol mol-1 CO2, whereas allocation ratios remained constant in Psiguria umbrosa.4. Differences in allocation patterns may reflect adaptive responses to environmental constraints imposed by different habitats. For Psiguria umbrosa, which is deciduous and often dies back during the dry season, allocation to root biomass may be important for the development of storage root tissue that may affect future growth and height.