摘要
果树的叶面积指数(LAI)能为精确喷雾提供重要参考依据,但常规定义从垂直方向检测叶面积指数不满足水平方向精确喷雾的实际需求。采用LAI近红外透射检测系统从水平方向上检测柑橘树的LAI值,进而计算水平方向的叶片总面积,并以应用直接法得到的叶片真实总面积作为标准值衡量误差大小,同时与垂直方向的检测结果比较。结果表明:在水平方向上东西和南北2个方向LAI检测结果的绝对误差的平均绝对值分别为0.45和0.40,相对误差的平均绝对值分别为17.37%和14.91%;叶片总面积的检测结果的误差与在垂直方向上应用LAI红外透射检测系统或WinSCANOPY型冠层分析仪的检测结果的误差接近;在水平方向上检测LAI和叶片总面积的准确性能够满足试验要求。
Leaf area index(LAI)of fruit trees provides significant references for precision spraying.However,measuring LAI from the vertical direction conventionally does not conform to the actual demand of lateral precision spraying.In this paper,using measuring system of citrus LAI with near-infrared transmittance technique,LAI of citrus trees was measured from the horizontal direction,the total leaf area was calculated,and then the real leaf area was obtained by direct method as standard values to measure the error.The experimental result was that the average absolute value of the absolute errors were 0.45 and 0.40 respectively,and average absolute value of the relative errors were 17.37% and14.91%respectively when measuring in east-west direction and south-north direction.Besides the error of measuring the total leaf area was not much different with the error of measuring from vertical direction by using the system or WinSCANOPY Canopy analysis system.It shows that the accuracy of measuring LAI or total leaf area from horizontal direction meets the requirement of the experiment.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
2015年第2期125-130,共6页
Journal of Huazhong Agricultural University
基金
国家自然科学基金项目(30871450)
现代农业产业技术体系建设专项(CARS-27)
公益性行业(农业)科研专项(201203016)
广东省惠州市产学研结合项目(2013B050013015)
关键词
叶面积指数
水平检测
精确喷雾
近红外透射
叶片总面积
leaf area index
horizontal measurement
precision spraying
near-infrared transmission
total leaf area
