摘要
植物叶面积计算是植物野外调查的重要关键内容,由于传统植物叶面积计算公式s=kab中,k值随物种的不同而存在很大差异,往往造成公式应用的困难。为了方便k值的正确选择,收集了具有代表性的9种形态的植物叶片,求出不同形态叶片的k值,为植物叶面积野外调查提供方便。k值计算方法为,利用计算机软件Image Pro Plus 6.0计算了植物叶片的面积、面积与外接矩形的面积比、最大直径、最小直径、宽度与长度共6个参数。借鉴传统植物叶片的分类方法,根据最大直径与最小直径的比值,将叶片分为披针形、长卵形、卵圆形、矩形或圆形4种类型,求出这4种类型叶片的k值分别为1/3,1/2,2/3和5/6。经过试验证明,公式在改进前,叶片面积k值的平均误差接近20%,改进后叶片面积的k值的平均误差仅为4%,叶片面积的估测误差明显降低。按叶形将叶片分类确定k值后,k值的选择方便快速,外业人员只需简单培训就可明显提升野外作业的效率和精度。
Plant leaf area calculation is the key content of plant field survey,it is the k in the traditionalformula of plant leaf area s=kab,that cause difficulty to apply it for its varying with the difference species.Inorder to facilitate the correct choice of k values,nine kinds of representative plant leaves forms were selectedas samples to calculate the k.the procedure of the k calculating was as,six indexes of the plant leaf wascalculated with Image Pro Plus 6.0,those were the area of the plants leafs,ratio of the leaf area with thebounding rectangle of which,the maximum diameter,the minimum diameter,length and width.Accordingtraditional classification of plant leaves,the plants leafs was divided into four kinds by the ratio of themaximum diameter and the minimum diameter,these were lanceolate,long oval,ovoid and round,respectively,the values were 1/3,1/2,2/3 and 5/6.The test proved that,the average error of k was 4%;however,it was 20%when the k taken 2/3.When k value has been determined with the leaf forms,it is easier to choose the k valuewhen working in fields.This will prompt the working efficiency due to its simplicity.
出处
《中国农学通报》
2015年第5期228-233,共6页
Chinese Agricultural Science Bulletin
基金
国家高新技术计划("863")项目课题"基于模型的果园与油菜作物生产数字化管理平台"(2013AA102405)
关键词
植物
叶面积
图像处理
误差
外接矩形
plants
leaf area
image processing
error
bounding rectangle
