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对各种作物测量叶面积的方法的优点和缺点,许多研究工作者曾经加以论述。几种著名的方法,如把每张叶片描在纸上,用面积计测定其面积,或把纸剪下来称其重量,从重量推算其面积;用感光纸,光电管,或用分成一平方厘米小方格的玻璃片测定其面积;以及粗略地量一下叶片直接计算叶面积。 有些方法需要复杂的工具;另一些方法则需要把叶片从植株上拿下来,使植株遭受损害。目前最通行的一种方法是应用回归法计算技术,量一下叶片的长度和最大宽度来估计叶面积,不但方法简单,而且叶片原封不动地留在植株上。一张叶片的面积通常是用下列公式来估计的:A=K(L×W),即叶面积=调整因素K(长度×宽度)。调整因素K值随着各种作物有所不同,即使同一种作物有时也有所不同。用这个公式估计叶面积,对棉花、玉米、高粱、大麦、木薯、蓖麻,以及苹果、桃、梨、葡萄等园艺作物,都曾有人作过试验。
The pros and cons of methods for measuring leaf area for various crops have been discussed by many researchers. Several well-known methods, such as tracing each leaf on a piece of paper, measuring its area with an area meter, or cutting the paper down to weigh it, and deducing its area from its weight; using photographic paper, a photocell, or a square Centimeters of small squares of glass to measure the area; and a rough measure of the leaf directly calculates the leaf area. Some methods require complicated tools; others require the leaves to be taken from the plant and the plant damaged. One of the most popular methods is to use regression calculation techniques to measure the leaf length and width to estimate the leaf area, not only the method is simple, but leaves the leaves intact on the plant. The area of a blade is usually estimated using the following formula: A = K (L × W), ie leaf area = adjustment factor K (length × width). Adjustments K values vary from crop to crop, even though the same crop sometimes differs. Using this formula to estimate the leaf area, cotton, corn, sorghum, barley, cassava, castor, and apple, peach, pear, and other horticultural crops have been tested.