Section of Plant Biology, Cornell University, 14853, Ithaca, NY, USA.
Oecologia. 1989 Mar;80(1):59-64. doi: 10.1007/BF00789932. Epub 2013 Mar 13.
The extent to which leaf-lobing influences the interception of direct solar radiation by individual plants was studied by means of computer simulations. The morphology, size and orientation ofAmbrosia artemisiifolia L. leaves were measured and used to construct a prototypeAmbrosia plant upon which a computer simulation was based. The leaf geometries of this simulation were then varied, and daily integrated irradiances (DII) were calculated for each variant plant simulation. Data indicate that lobedAmbrosia leaves do not confer an advantage to light-interception based upon values of DII. Simulated plants identical in all respects to the prototype, but with simple, elliptic leaves, had equivalent DII values to the prototype. Simulations with leaves in which gaps between lobes were "filledin" had reduced light-interception efficiencies compared to the prototype and to a simulation with elliptic-leaves. Lightinterception was maximized when leaves on distal nodes wereAmbrosia-like and leaves on proximal nodes were elliptic. The data are interpreted to indicate that lobingperse is not functionally advantageous to light-interception; however, gradients of leaf-lobing along the length of shoots may be very significant in terms of overall light interception.
通过计算机模拟研究了叶裂程度对单株植物直接太阳辐射截留的影响。测量了豚草属植物的形态、大小和方向，并利用这些信息构建了一个基于豚草属植物的计算机模拟原型。然后改变了该模拟的叶片几何形状，并为每个变体植物模拟计算了每日积分辐照度 (DII)。数据表明，具有叶裂的豚草属植物在基于 DII 值的光截获方面并没有优势。在各方面都与原型相同但叶片为简单椭圆形的模拟植物，其 DII 值与原型相等。与原型和具有椭圆形叶片的模拟相比，具有叶裂间隙“填充”的叶片的光截获效率降低。当远端节点上的叶片类似于豚草属植物而近端节点上的叶片为椭圆形时，光截获量最大。数据表明，叶裂本身在光截获方面并没有功能优势；然而，叶片沿茎长度的叶裂梯度在整体光截获方面可能非常重要。
