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1、中國農(nóng)學(xué)通報(bào)2014,30(3):85-90ChineseAgriculturalScienceBulletin基于冠層反射光譜的夏玉米葉片氮積累量估測李國強(qiáng)，吳士文，鄭國清，張學(xué)治，馮曉，張杰，胡峰（河南省農(nóng)業(yè)科學(xué)院農(nóng)業(yè)經(jīng)濟(jì)與信息研究所，鄭州450008）摘要：為實(shí)現(xiàn)夏玉米冠層氮素狀況的實(shí)時(shí)無損監(jiān)測，于2009—2010年連續(xù)2個(gè)生長季，通過不同玉米品種和施氮水平下的田間試驗(yàn)，研究夏玉米葉片氮積累量與冠層反射光譜的相關(guān)關(guān)系，提出葉片氮積累量的敏感光譜參數(shù)，并建立葉片氮積累量的定量估算模型。結(jié)果表明，夏玉米葉片氮積累量隨施氮水平的提高而增加；可見光波段的460~670nm和
2、近紅外區(qū)的780~1100nm是監(jiān)測玉米葉片氮積累量變化差異的敏感波段；歸一化植被指數(shù)(NDVI)、優(yōu)化的簡單比值指數(shù)(MSR)、優(yōu)化土壤調(diào)節(jié)植被指數(shù)(OSAVI)、修正土壤調(diào)整植被指數(shù)(MSAVI)和土壤調(diào)整植被指數(shù)(SAVI)與葉片氮積累量相關(guān)性較好。利用不同年際獨(dú)立試驗(yàn)數(shù)據(jù)對監(jiān)測模型進(jìn)行檢驗(yàn)，以O(shè)SAVI為自變量構(gòu)建的葉片氮積累量監(jiān)測模型效果最優(yōu)，相關(guān)系數(shù)(r)為0.6745，均方根差(RMSE)為1.2368。利用本研究確立的玉米葉片氮積累量與冠層反射光譜的定量關(guān)系，可用來定量估測葉片氮積累量的變化狀況。關(guān)鍵詞：夏玉米；冠層反射光譜；葉片氮積累量；監(jiān)測模型中圖分類號
3、：S512文獻(xiàn)標(biāo)志碼：A論文編號：2013-0800MonitoringLeafNitrogenAccumulationinSummerMaizewithCanopyReflectanceSpectraLiGuoqiang,WuShiwen,ZhengGuoqing,ZhangXuezhi,FengXiao,ZhangJie,HuFeng(AgriculturalEconomy&InformationResearchInstitute,HenanAcademyofAgriculturalSciences,Zhengzhou450008)Abstract:Torealizen
4、on-destructiveandquickassessmentofleafnitrogenstatusinsummermaize,twofieldexperimentswereconductedwithdifferentmaizecultivarsandnitrogenlevelsacrosstwogrowingseason,andtime-coursemeasurementsweretakenoncanopyspectralreflectanceandleafnitrogenaccumulationduringtheperiodofexperiment.Baseonth
5、ecanopyreflectanceandderivedvegetationindex,weanalyzedthequantitativerelationshipsbetweenleafnitrogenaccumulationandcanopyreflectanceindifferentmaizecultivarsundervariednitrogenrates,andputforwardthesensitiveparametersandmonitoringequationforleafnitrogenaccumulation.Theresultsshowedthat,le
6、afcanopynitrogenaccumulationinmaizeincreasedwithincreasingnitrogenrates.Wavelengthsat460-670nmand780-1100nmweresensitivetoleafnitrogenaccumulationfornitrogendiagnosis.Leafnitrogenaccumulationwashighlycorrelatedwithnormalizeddifferencevegetationindex(NDVI),modifiedsimpleratio(MSR),optimalso
7、il-adjustedvegetationindex(OSAVI),modifiedsoil-adjustedvegetationindex(MSAVI),soil-adjustedvegetationindex(SAVI),2respectively.ComparingtheRandstandarderrorofregressionmodel,thespectralindexofOSAVIwasthetestparameterforpredictingleafnitrogenaccumulation.Themon
