CAJ | 학술논문

在分析冬小麦生长期冠层反射光谱和叶绿素含量变化特征的基础上,对二者之间的相关性进行了研究.表明从小麦拔节期开始,冠层反射光谱在可见光区(400～750 nm)的反射率先降低而后升高,以孕穗期反射率最低;在近红外区(750～1 000nm)冠层反射率由拔节期至孕穗期反射率降低,然后开始上升.扬花期上升至最高点后又开始下降,直至乳熟期降至最低.冬小麦冠层反射率与叶绿素含量相关分析结果表明,冬小麦拔节期和孕穗期二者呈正相关,扬花期二者呈负相关;整个生长期中,孕穗期可见光区552 nm处反射率与叶绿素含最相关系数最大达0.89.依据冬小麦牛长期冠层反射光谱红边拐点位置,分别建市了拔节期叶绿素含量线性检测模型(R~2=0.92)和孕穗期二项式模型(R~2=0.91),用于冬小麦叶绿素含量的无损检测是可行的.
재분석동소맥생장기관층반사광보화협록소함량변화특정적기출상,대이자지간적상관성진행료연구.표명종소맥발절기개시,관층반사광보재가견광구(400～750 nm)적반사솔선강저이후승고,이잉수기반사솔최저;재근홍외구(750～1 000nm)관층반사솔유발절기지잉수기반사솔강저,연후개시상승.양화기상승지최고점후우개시하강,직지유숙기강지최저.동소맥관층반사솔여협록소함량상관분석결과표명,동소맥발절기화잉수기이자정정상관,양화기이자정부상관;정개생장기중,잉수기가견광구552 nm처반사솔여협록소함최상관계수최대체0.89.의거동소맥우장기관층반사광보홍변괴점위치,분별건시료발절기협록소함량선성검측모형(R~2=0.92)화잉수기이항식모형(R~2=0.91),용우동소맥협록소함량적무손검측시가행적.
The canopy spectral reflectance and chlorophyll content of winter wheat were measured and analyzed in the whole growing season. The characteristics of canopy spectral reflectance indicated that the canopy spectral reflectance changed significantly at different stages. It decreased first and increased later with growth progress in the visible region (400-750 nm) after jointing stage, then the reflectance was lowest at booting stage. In near-infrared region (750-1 000 nm) the spectral reflectance climbed sharply. The canopy reflectance was declined at booting stage and rose to the highest point at flowering stage. It dropped to minimum level subsequently at milk-ripe stage. However, the spectral reflectance characteristics at jointing stage and booting stage were used to detect the chlorophyll content High correlation was observed between the canopy spectral reflectance and chlorophyll content The positive correlation of canopy spectral reflectance with chlorophyll content was found at jointing stage and booting stage. Because the plant spectral reflectance was effected by chlorophyll greatly in visible region, the correlation coefficient reached 0. 89 at 552 ran in booting stage. On the contrary, there was a negative correlation at flowering stage. Meanwhile, the red edge inflection point as one of the most important spectral parameters was analyzed at winter wheat growth stages based on the first derivative of reflectance spectra. The relation between the red edge inflection point and chlorophyll content was observed in each plot and the analysis results illustrated that the red edge inflection points could help detect the chlorophyll content at jointing stage and booting stage. The linear model of chlorophyll content with red edge inflection points was built at jointing stage (R~2 =0. 92). High correlation was found between thered edge inflection point and chlorophyll content at booting stage. It was showed that the binomial model (R~2 =0. 91) was better than linear model (R~2 =0. 73). It was indicated that using spectral analysis to detect the winter wheat chlorophyll content non-destructively was feasible. The obtained conclusions also provided theoretical basis for further researches on measuring methods of chlorophyll content in the field.