紫花苜蓿现蕾期叶片SPAD值的高光谱估测  

Hyperspectral Assessment for SPAD of Medicago sativa Leaves in Budding Period

作　　者：杨洁[1,2] 林杉[1,2] 位蓓蕾[1,2] 周小猛[1,2] 张建勇[1,2] 陈超[1,2] 

机构地区：[1]中国矿业大学(北京)土地复垦与生态重建研究所 [2]矿山生态安全教育部工程研究中心,北京100083

出　　处：《贵州农业科学》2014年第8期233-236,共4页Guizhou Agricultural Sciences

基　　金：中央高校基本科研业务费专项(2010YD03)

摘　　要：为探明高光谱反射率与紫花苜蓿叶片 SPAD值间的相关性，利用 ASD Field Spec3地物光谱仪测定现蕾期紫花苜蓿的高光谱反射率，采用统计分析方法对其进行研究。结果表明：在波长469～533 nm、562～605 nm、616～669 nm、687～701 nm和720～752 nm范围内紫花苜蓿叶片 SPAD值与一阶微分光谱呈极显著相关，微分变量 D659、SDy、SDy/SDb、SDr/SDy、SDnir/SDb、（SDr-SDy）/（SDr＋SDy）和（SDnir-SDb）/（SDnir＋SDb）与紫花苜蓿叶片 SPAD 值的相关性较好；构建并鉴选出精度较高（R2＝0．728）的y＝7．5123！0．3957（SDr/SDy）模型作为估测紫花苜蓿 SPAD值的最佳模型，其预测精度达92．79％。In order to ascertain the relationship between hyperspectral reflectance and SPAD value of M.sativa,by using the ASD Field Spec3 field spectrometer,the authors measured the hyperspectral reflectance of M.sativa in budding period,and statistical analysis methods were used as well.The results showed that SPAD values at 469～533 nm,562～605 nm,616～669 nm,687～701 nm and 720～752 nm were significantly positively correlated with the first derivative parameters D659,SDy,SDy/SDb,SDr/SDy,SDnir/SDb,（SDr-SDy）/（SDr＋SDy）and （SDnir-SDb）/（SDnir＋SDb）.The SPAD monitoring model,y = 7.512 3-0.395 7 （SDr/SDy）（R2=0.728）,was built,which was the best monitoring model, its determination coefficient was the highest（R2=0.728）,the prediction accuracy reached 92.79%.

关 键 词：紫花苜蓿 高光谱 SPAD 估测模型 

分 类 号：S121[农业科学—农业基础科学]