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%.
出处
《贵州农业科学》
CAS
北大核心
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)