三、改进干重法 (一) 改进干重法的由来和原理通过测定植物叶子在自然光照条件下重量增加韵方法,了解植物进行光合作用的情况,称为干重法,过去叫做半叶法。半叶法最初由德国植物生理学家萨克斯(Sachs)于1883年首创。其原理和方法是在自然光照条件下的某一时刻,以一叶片的中脉为界,切取中脉一侧半叶部分,测定其面积和干重。数小时之后再切取剩余另一侧半叶部分,测定 Third, to improve the dry weight method (A) to improve the origin and principle of dry weight by measuring plant leaves in the natural light conditions weight increase rhyme method to understand the photosynthesis of plants, known as the dry weight method, the past called the half-leaf method . The half-leaf method was first pioneered by the German plant physiologist Sachs in 1883. The principle and method are that at a certain time under natural light conditions, taking the midrib of a leaf as a boundary, the half-leaf part on one side of the midrib is cut out to measure its area and dry weight. A few hours later cut off the remaining part of the other half of the leaves, measured