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了解植物的叶面积,对于计算植物生产率、研究气体交换现象、测定林冠郁闭度等许多方面有用。叶面积计用于测定植株上摘下的或连在小枝上的一片阔叶的面积是有效的。然而,问题是缺乏直接测定全株总叶面积的方法。Grier 和 Waring(1974)、Snell 和 Brown(1978)等人的研究表明,木本植物叶的生物量与茎中输导组织的横切面面积是紧密相关的。而且,因为叶表面积和干重之间的关系紧密,所以,叶或针叶面积与边材面积也是紧密相关的(Rogers Hinckley,1979;Waring 和 Others,1977)。于是,只要测出树干中边材面积,就可估算全株叶面积。我们在研究森林树木的耗水量及其在水文循环中的作用方面,需要叶面积的资料。就洛基山中部的亚高山森林树种来说一般缺乏这些资料。研究株冠各个部分的气体交换现象。还需估计叶的垂直分布。叶面积和茎的输导组织面积的相关性,可能是以株冠的需水量与茎的导水能力之间的生理平衡为基础的。于是可以设想,不仅可以确定全树冠的叶面积与该树冠之下茎的
Knowing the leaf area of a plant is useful for many purposes, including calculating plant productivity, studying gas exchange phenomena, and measuring canopy density. It is effective for the leaf area meter to be used to determine the area of a hard leaf taken from or attached to a branch. However, the problem is the lack of a direct method to determine the total leaf area of the whole plant. Studies by Grier and Waring (1974), Snell and Brown (1978) and others show that the biomass of woody leaves is closely related to the cross-sectional area of the tissue in the stem. Moreover, because of the close relationship between leaf surface area and dry weight, leaf or coniferous area is also closely related to sapwood area (Rogers Hinckley, 1979; Waring and Others, 1977). So, as long as the sapwood area measured in the trunk, you can estimate the whole plant leaf area. We need leaf area information to study the water consumption of forest trees and their role in the hydrological cycle. In the case of subalpine forest species in central Rocky Mountain, there is a general lack of such information. Study of the various parts of the coronal gas exchange phenomenon. Also need to estimate the vertical distribution of leaves. The correlation between leaf area and stem tissue area may be based on the physiological balance between the water requirement of the canopy and the ability of the stem to conduct water. It is then conceivable not only to determine the leaf area of the whole canopy below the canopy