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1、作物学报ACTAAGRONOMICASINICA2008,34(11):2046−2052http://www.chinacrops.org/zwxb/ISSN0496-3490;CODENTSHPA9E-mail:xbzw@chinajournal.net.cnDOI:10.3724/SP.J.1006.2008.02046玉米和大豆光合有效辐射吸收比例与植被指数和叶面积指数的关系1,21,*111,21,2杨飞张柏宋开山王宗明刘焕军杜嘉12(中国科学院东北地理与农业生态研究所,吉林长春130012;中国科学院研究生
2、院,北京100039)摘要:基于东北典型黑土区的玉米和大豆的实测光谱反射率、光合有效辐射及叶面积数据,选取常用的9种植被指数,并根据光谱曲线特征和植被指数结构建立了两种新的植被指数,对其估算玉米和大豆冠层FPAR效果进行了对比分析。结果表明,各植被指数与冠层光合有效辐射吸收比例(FPAR)的关系因植被类型而异。以近、短波红外波段较以可见光、近红外波段计算植被指数的估算效果好。NDVI、RVI在可见光、近红外波段计算的植被指数中估算22FPAR效果较好,玉米估算模型R分别为0.81和0.82,大豆估算模型R均为0.81;
3、NDSI、RSI在近、短波红外波段22计算的植被指数中较好,玉米估算模型R均为0.86,大豆估算模型R均为0.84,优于NDVI和RVI。试验表明,利用近、短波红外波段估算FPAR是可行的;冠层含水量较土壤背景对FPAR影响更大;玉米和大豆冠层FPAR与叶面2积指数(LAI)呈较好的对数关系,估算模型R分别为0.75和0.70;但用植被指数估算FPAR效果要优于用叶面积指数。关键词:玉米;大豆;光合有效辐射吸收比例;植被指数;叶面积指数RelationshipbetweenFractionofPhotosyntheti
4、callyActiveRadiationandVegetationIndices,LeafAreaIndexofCornandSoybean1,21,*111,21,2YANGFei,ZHANGBai,SONGKai-Shan,WANGZong-Ming,LIUHuan-Jun,andDUJia12(NortheastInstituteofGeographyandAgroecology,ChineseAcademyofSciences,Changchun130012,Jilin;GraduateSchoolofChin
5、eseAca-demyofSciences,Beijing100039,China)Abstract:Basedonthemeasuredreflectance,photosyntheticallyactiveradiation,andleafareaindex(LAI),ninecommonvege-tationindicesandtwovegetationindices,developedbytheauthorsaccordingtothecharacteristicofreflectancecurvesandth
6、evegetationindexstructures,wereusedtoestimatefractionofphotosyntheticallyactiveradiation(FPAR)incorn(ZeamaysL.)andsoybean[Glycinemax(L.)Merri.].TherelationshipsbetweenvegetationindicesandFPARdifferedindifferentvegetationtypes.Theperformancesofnearinfraredandshor
7、twavebandswerebetterthantheseofvisibleandnearinfraredbandsinFPARestima-tionbyvegetationindices.Normalizeddifferencevegetationindex(NDVI)andratiovegetationindex(RVI)werethebestinthe2vegetationindicescalculatedbyreflectanceinvisibleandnearinfraredbandsforFPARestim
8、ation,withRofestimatingmodels0.82and0.81forcorn,bothof0.81forsoybean.Normalizeddifferenceshortwaveindex(NDSI)andratioshortwaveindex(RSI)2werebestinthevegetationindice
