Cavallero L, López D, Barberis I M
Facultad de Humanidades y Ciencias, Universidad Nacional del Litoral, Argentina.
Plant Biol (Stuttg). 2009 May;11(3):379-91. doi: 10.1111/j.1438-8677.2008.00123.x. Epub 2008 Oct 6.
Plants show different morphologies when growing in different habitats, but they also vary in their morphology with plant size. We examined differences in sun- and shade-grown plants of the bromeliad Aechmea distichantha with respect to relationships between plant size and variables related to plant architecture, biomass allocation and tank water dynamics. We selected vegetative plants from the understorey and from forest edges of a Chaco forest, encompassing the whole size range of this bromeliad. Plant biomass was positively correlated with most architectural variables and negatively correlated with most biomass allocation variables. Understorey plants were taller and had larger diameters, whereas sun plants had more leaves, larger sheath area, sheath biomass and sheath mass fraction. All tank water-related variables were positively correlated with plant biomass. Understorey plants had a greater projected leaf area, whereas sun plants had higher water content and evaporative area. Plasticity indices were higher for water-related than for allocation variables. In conclusion, there were architectural and biomass allocation differences between sun- and shade-grown plants along a size gradient, which, in turn, affected tank water-related variables.
植物在不同的栖息地生长时会呈现出不同的形态，而且它们的形态也会随着植株大小而变化。我们研究了凤梨科植物二列姬凤梨在阳光充足和荫蔽环境下生长的植株，在植株大小与植物结构、生物量分配及叶筒水分动态相关变量之间的关系上的差异。我们从查科森林的林下植被和林缘选取了营养体植株，涵盖了这种凤梨科植物的整个大小范围。植物生物量与大多数结构变量呈正相关，与大多数生物量分配变量呈负相关。林下植被中的植株更高，直径更大，而向阳植株的叶片更多，叶鞘面积、叶鞘生物量和叶鞘质量分数更大。所有与叶筒水分相关的变量都与植物生物量呈正相关。林下植被中的植株有更大的叶面积投影，而向阳植株的含水量和蒸发面积更高。与分配变量相比，与水分相关变量的可塑性指数更高。总之，在沿着大小梯度的阳光充足和荫蔽环境下生长的植株之间，存在结构和生物量分配上的差异，这反过来又影响了与叶筒水分相关的变量。
