几种沙生植物叶面积的估算与经验公式

沙生灌木具有不规则或狭小的叶子,一些叶面积仪难以直接求出其实际面积。其叶面积的估算又在水分平衡研究中至关重要。本文通过合理估算与蒸腾作用有关的叶片面积,在此基础上提出了蒸腾有效表面积的概念(TESAI),以确切表达控制蒸腾流的实际叶表面,对于阔叶植物及针叶植物TESAI与LAI的关系分别是:TESAI=2LAI和TESAI=πLAI。通过大量抽样调查建立了估算几种灌木叶面积的经验公式。

A Study on the Estimation of Leave Area and Its Empirical Formulation of Some Psammophyte Shrub Species

Many psammophytes have tiny and irrigular leaves, the area of which is difficult tl be measured by intruments, nevertheless, the accurate magnititude of the leaf aera is essential in the evaluation of water balance of plant community. Hence, this paper's main aim lies in the rational estimation of transpirational related leaf area by con cerning the acctual processes of transpiration. And the concept of transpirational effective surface area index (TESAI) is established in order to get the real leaf surface area which accually controls the transpirational water flux. The TESAI for broad -leaved plants is TESAI=2LAI, wheres, the value is TESAI=3. 14LAI for needle-leaved plants or plants with tinny leaves. For practical purporse, the empirical formulae for the estimation of several shrub species are established based on experimental data.