HYDRODYNAMIC MODELING STUDY OF ANGIOSPERM LEAF VENATION TYPES

被引:30
作者
ROTH, A [1 ]
MOSBRUGGER, V [1 ]
BELZ, G [1 ]
NEUGEBAUER, HJ [1 ]
机构
[1] UNIV BONN,INST GEODYNAM,BONN,GERMANY
来源
BOTANICA ACTA | 1995年 / 108卷 / 02期
关键词
LEAF VENATION; WATER TRANSPORT; TOOTHED LEAF MARGIN; ENTIRE LEAF MARGIN; POROELASTIC MEDIUM;
D O I
10.1111/j.1438-8677.1995.tb00841.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The morphology of leaf venation has been studied repeatedly and various systems have been proposed for the classification of the observed leaf venation patterns. Almost nothing is known, however, about the functional properties of the various venation types. Using a computer modelling approach we analysed the water transport properties of typical craspedodromous and brochidodromous venation patterns. The water transport through the leaf and the veins was modelled as a fluid flow through a porous medium and the mathematical model was solved with the Finite Element Method. The simulations illustrate that the leaf margin represents a critical region in terms of water supply. The results provide a plausible functional explanation for three well known phenomena: 1) the correlation between craspedodromous venation and the formation of leaf teeth; 2) the fact that craspedodromous venation is more common in temperate than in tropical regions and 3) the fact that xeromorphic leaves tend to have more closed venation.
引用
收藏
页码:121 / 126
页数:6
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