一种马铃薯叶面积校正系数的确定方法  

A Determination Method of Correction Coefficient of Potato Leaf Area

作　　者：万信[1,2] 李巧珍[1,3] 方德彪[1,4] 杨兴国[1,4] 贾建英[1,2] 任华荣[1,2] 

机构地区：[1]中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点开放实验室,兰州730020 [2]西北区域气候中心,兰州730020 [3]甘肃省定西市气象局,定西743000 [4]甘肃省气象局,兰州730020

出　　处：《资源科学》2012年第8期1533-1537,共5页Resources Science

基　　金：公益性行业(气象)科研专项:"中国北方果树霜冻灾害防御关键技术研究"(编号:GYHY201206023-06);"西北地区旱作农业对气候变暖的响应特征及其预警和应对技术研究"(编号:GYHY200806021);2007年度中国气象局基建和事业费项目:"西北区域干旱监测预警评估业务系统"

摘　　要：目前比较常用的叶面积测定方法中,以叶面积仪、求积仪和计算纸法测量精度最高,而以校正系数法最为简便,易于大范围推广使用。马铃薯由于叶片多且规则程度较差等原因,尚未有简便易行的类似于小麦等作物的叶面积校正系数见报,造成了马铃薯叶面积测定实际操作时难度及误差较大。本文通过试验研究,以计算纸法测定值为标准,确定了马铃薯叶面积另外三种不同测定方法的校正系数:长宽积法叶面积校正系数K为0.76,该方法简单易行、便于推广;机械式求积仪叶面积测量结果为实际面积的92%,测量值需乘以1.09得到比较真实的面积,仪器操作过程繁琐,不便使用;SHY-150型扫描式活体面积仪测量值仅为实际面积的71%,测定值需乘以1.40得到实际面积,由于其价格昂贵、加之对操作过程要求较高容易产生人为误差等原因,影响普遍使用。Among the nine frequently used determination methods of leaf area, the mechanical leaf area meter, SHY-150 and the plot method of multiplying length by width have the highest accuracy. The coefficient method is the simplest one and is easy to promote for use in large scale. We can get the leaf area correction coefficients of main crops from literature, such as rice, wheat, corn, cotton and sorghum, and researches on some economic crops have already been done. However, due to the amount of potato leaves and their irregular shape, there has been no simple and convenient correction coefficient of leaf area similar to that of wheat yet, resulting in the difficulty in actual measurement of the leaf area and directly affecting the measurement accuracy. In this paper, through experimental study, we performed gap analysis of the accuracy of plot method and figured out the correction coefficient with paper measured values as the standard. At the same time, we tested the applicable range, degree and application effects of the mechanical leaf area meter and SHY-150. At last, we recommended using the plot method of multipling length by width to measure the leaf area of Potato, which can take both usability and accuracy into account. Comparison results of the three methods are as follows： 1） There will be certain error in the actual value when using the mechanical leaf area meter. The measured area is only 92 percent of the actual area, so the measurement value needs to be multiplied by 1.09 to get the real area. Measuring Error is big when leaves are small and small when leaves are large. Besides, during the determination process, the reading is error-prone, the machine is difficult to operate, it wastes time and effort, needs higher labor intensity of staff and is inconvenient to use; 2） SHY-150 has a large error, with the measured area being 71 percent of the actual area, and the measurement value needs to be multiplied by 1.40 to get the real area. Moreover, the meter is very expensive and requires higher profession

关 键 词：马铃薯 叶面积 校正系数 

分 类 号：S532[农业科学—作物学] S127