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首页> 外文期刊>Australian Journal of Botany >The function of foliar scales in water conservation: an evaluation using tropical-mountain, evergreen shrubs of the species Rhododendron in section Schistanthe (Ericaceae)
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The function of foliar scales in water conservation: an evaluation using tropical-mountain, evergreen shrubs of the species Rhododendron in section Schistanthe (Ericaceae)

机译：叶鳞在水源保护中的功能：在Schistanthe（Ericaceae）节中使用杜鹃花属的热带山峰，常绿灌木进行评估

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摘要

Leaf scales (scarious trichomes) have putative significance to leaf water relations, energy balance, and gas exchange. A survey of leaf scales, stomata, and leaf morphology across 83 species of Rhododendron section Schistanthe in a common garden, at 1207-m elevation on Moana Loa, Hawai'i, was used to probe three possible functional models for scales on abaxial leaf surfaces. Scale density was commonly 10mm(-2), but densities up to 50mm(-2) occurred. The median stomatal density was 200mm(-2), but ranged up to 500mm(-2). Stomatal dispersion was grouped into four classes based on the proportion of stomata located under scales. Stomatal pore index decreased as scale density and scale importance factor increased. Thus, maximum stomatal conductance as represented by stomatal pore index decreased as the effect of scales on the leaf surface increased. Stomatal pore index increased as the elevation of the native range increased. However, the relative effects of scales on stomata peaked at mid-elevation. Principal components analysis indicated that the most important habitat factors determining both scale importance factor and stomatal pore index were elevation and growth form (epiphyte or terrestrial). Therefore, this survey indicated that scales serve a water conservation function, which is most effective at mid-elevation of the native range.
机译：叶鳞（鳞状毛）对叶水关系，能量平衡和气体交换具有假定的意义。在夏威夷Moana Loa海拔1207-m的一个普通花园中，对一个常见花园中的83个杜鹃花段Schistanthe的鳞片，气孔和叶片形态进行了调查，以探索三种可能的背面叶鳞片功能模型。鳞片密度通常为10mm（-2），但发生密度高达50mm（-2）。中位气孔密度为200mm（-2），但最高可达500mm（-2）。根据规模以下的气孔比例将气孔弥散分为四类。气孔孔隙度随着水垢密度和水垢重要性因子的增加而降低。因此，以最大的气孔导度为代表的气孔孔隙度指数随着叶表面鳞片效应的增加而降低。气孔孔隙度指数随天然范围的升高而增加。但是，鳞片对气孔的相对影响在海拔中部达到顶峰。主成分分析表明，决定尺度重要因子和气孔孔径指数的最重要的栖息地因素是海拔和生长形式（表生或陆生）。因此，这项调查表明，秤具有节水功能，在原生范围的中高程中最有效。

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