摘要
通过大田和室内试验,测定了玉米冠层、完全展开倒一、三叶在不同发育期的反射光谱及叶片的叶绿素、类胡萝卜素含量。结果表明,随发育期推迟,冠层反射率在可见光范围内降低,在近红外区域增高;冠层光谱的红边具有"双峰"现象,红边位置λred随发育期推迟呈"红移"现象,而红边幅值Dλred和红边面积Sred呈"红移"和"蓝移"现象;叶面积指数、地上生物量和鲜叶重与冠层λred、Dλred、Sred显著相关,叶片叶绿素和类胡萝卜素含量与其λred、Dλred、Sred也显著相关。
The hyperspectral reflectances of the canopy,the first and the third unfold leaves from the top of two varieties of corn are measured by a ASD FieldSpec Pro FRTM in field and indoor in different stages.The concentrations of chlorophyll and carotenoid of leaves corresponding to the spectra were determined by biochemical method.The correlation between the pigment concentrations,leaf area indices,biomass above ground and fresh leaf mass and the red edge parameters of corn were analyzed.The hyperspectral reflectance is gradually getting smaller in the visible region and bigger in the near infrared region along with growth.There are'two peaks' phenomena for the red edge of canopy spectra of corn.There are'red shift'phenomena for the position of red edge λred,the slope of red edge Dλred and the area of red edge Sred, but'blue shift' for Dλred and Sred of the canopy spectra.The leaf area indices,biomass above ground and fresh leaf mass are very significantly correlative to the red edge parameters λred,Dλred and Sred of the canopy spectra, and the concentrations of chlorophyll and carotenoid of leaves also significantly correlative to their red edge parameters λred,Dλred and Sred.This proves that the red edge parameters λred,Dλred and Sred can be quitely used to estimate the leaf area indices,biomass above ground ,fresh leaf mass and the concentrations of chlorophyll and carotenoid of leaves for corn.
出处
《山地农业生物学报》
2003年第3期189-194,共6页
Journal of Mountain Agriculture and Biology
基金
国家自然科学基金(40271078)
国家"863"项目"地物波谱数据库"资助项目
关键词
玉米
红边特征
高光谱反射率
红边参数
相关分析
光谱测定
农学参数
corn
hyperspectral reflectance
red edge parameter
agronomic parameter
regression analysis
spectrum determination
