CAJ | 학술논문

测定拔节期水浇地与旱地春小麦冠层光谱、叶绿素含量、覆盖度、苗高和叶宽，采用回归分析方法建立春小麦叶绿素含量高光谱估测模型，并对模型精度进行检验。结果表明：阳坡和双面坡地春小麦拔节期叶绿素含量与原始光谱反射率在可见光和近红外波段均呈正相关，水浇地和阴坡地在723 nm以前相关系数为负，723 nm以后为正。各地类春小麦叶绿素含量与各高光谱变量的相关性均较好，均达到了极显著水平（P＜0．01）。无论在可见光还是近红外波段，水浇地春小麦叶绿素含量均与倒数之对数 lg（1/R）的相关性最好，相关系数最大值可达0．98；阴坡地则与一阶微分的相关性最好，最大为0．94；而与阳坡和双面坡地相关性最好的高光谱指数为归一化植被指数。在各个波段，倒数之对数模型lg（1/R）、一阶微分模型（p′）和归一化植被指数模型（N）分别是估测水浇地、阴坡地、阳坡和双面坡地春小麦叶绿素含量的最佳模型。虽然各模型 R2均超过0．90，精确度均大于0．91，但阴坡地、阳坡和双面坡地的模型精确度和准确度略低于水浇地。以上模型的建立可为今后估测水浇地与旱地春小麦的健康状况提供参考。
측정발절기수요지여한지춘소맥관층광보、협록소함량、복개도、묘고화협관，채용회귀분석방법건립춘소맥협록소함량고광보고측모형，병대모형정도진행검험。결과표명：양파화쌍면파지춘소맥발절기협록소함량여원시광보반사솔재가견광화근홍외파단균정정상관，수요지화음파지재723 nm이전상관계수위부，723 nm이후위정。각지류춘소맥협록소함량여각고광보변량적상관성균교호，균체도료겁현저수평（P＜0．01）。무론재가견광환시근홍외파단，수요지춘소맥협록소함량균여도수지대수 lg（1/R）적상관성최호，상관계수최대치가체0．98；음파지칙여일계미분적상관성최호，최대위0．94；이여양파화쌍면파지상관성최호적고광보지수위귀일화식피지수。재각개파단，도수지대수모형lg（1/R）、일계미분모형（p′）화귀일화식피지수모형（N）분별시고측수요지、음파지、양파화쌍면파지춘소맥협록소함량적최가모형。수연각모형 R2균초과0．90，정학도균대우0．91，단음파지、양파화쌍면파지적모형정학도화준학도략저우수요지。이상모형적건립가위금후고측수요지여한지춘소맥적건강상황제공삼고。
In order to establish high spectral chlorophyll content model based on correlation analysis between chloro-phyll content and five spectral variables of spring wheat under irrigated and dry land,canopy spectral,chlorophyll con-tent,ground cover,seedling height,leaf width at jointing stage of spring wheat under different land were determined, and the precision of these model were tested .The result showed a positive correlation between chlorophyll content and o-riginal spectrum at visible light and near infrared band of sunny and double slopes at jointing stage of spring wheat,and a negative correlation below 723 nm and a positive correlation above 723 nm for irrigated land and shady slope .There was markedly significant correlation (P<0 .01)between chlorophyll content and hyperspectral variables of spring wheat un-der different lands .Regardless of visible light or near infrared wave band,lg(1/R)was significantly correlated with the leaf chlorophyll content,with a correlation coefficient of 0 .98 .Shady slope was correlated with first derivative (r=0 .94),while for sunny and double slopes normalized difference vegetation index showed significant relationship .For each band,lg(1/R),p′,and N were suitable indexes estimating chlorophyll content for all lands of irrigated land, shady slope,and sunny and double-sided slope .Although the regression determination coefficient R2 was more than 0 . 90,precision and accuracy of the proposed for shady slope,sunny and double slope are slightly lower than that of irrigat-ed land .