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1、山地农业生物学报22(3):189～194,2003JournalofMountainAgricultureandBiology·研究报告·X玉米高光谱及其红边特征分析1,222唐延林,王秀珍,王人潮(1.贵州大学理学院物理系,贵州贵阳550025;2.浙江大学农业遥感与信息技术应用研究所,浙江杭州310029)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
2、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。关键词:玉米;高光谱反射率;红边参数;农学参数;相关分析;光谱测定中图分类号:S123;S513101文献标识码:A文章编号:1008-0457(2003)03-0189-06Studyonthehyperspectralandtheirrededgecharacteristicsofcorn1,222TANGYan2lin,WANGXiu2zhen,WANGRen2chao(
3、1.DepartmentofPhysics,SchoolofSciences,GuizhouUniversity,GuizhouGuiyang550025,China;2.InstituteofAgricultureRemoteSensing&InformationSystemApplication,ZhejiangUniversity,ZhejiangHangzhou310029,China)Abstract:Thehyperspectralreflectancesofthecanopy,thefirstandthethirdunfoldleavesfromthetopoft
4、wovarietiesofcornTMaremeasuredbyaASDFieldSpecProFRinfieldandindoorindifferentstages.Theconcentrationsofchlorophyllandcarotenoidofleavescorrespondingtothespectraweredeterminedbybiochemicalmethod.Thecorrelationbetweenthepigmentconcentrations,leafareaindices,biomassabovegroundandfreshleafmassan
5、dtherededgeparametersofcornwereanalyzed.Thehyperspectralreflectanceisgraduallygettingsmallerinthevisibleregionandbiggerinthenearinfraredregionalongwithgrowth.Thereare“twopeaks”phenomenafortherededgeofcanopyspectraofcorn.Thereare“redshift”phenomenaforthepo2sitionofrededgeλred,theslopeofrededg
6、eDλredandtheareaofrededgeSred,but“blueshift”forDλredandSredofthecanopyspectra.Theleafareaindices,biomassabovegroundandfreshleafmassareverysignificantlycorrelativetotherededgeparametersλred,DλredandSredofthecanopyspectra,andtheconcentrationsofchlorophyllandcarotenoidofleavesalsosignifi2cantly
7、correlativetotheirrededgeparametersλred,DλredandSred.Thisprovesthattherededgeparametersλred,DλredandSredcanbequitelyusedtoestimatetheleafareaindices,biomassaboveground,freshleafmassandtheconcentrationsofchloro2phyllandcarotenoidofleavesforcorn.Keyw
