CAJ | 학술논문

通过实地光谱测量，研究了不同碱化程度土壤上向日葵在不同生育期冠层光谱反射率、红边参数及与对应的土壤碱化度和pH之间的关系。结果表明，不同碱化程度土壤上向日葵生育期冠层反射光谱具有绿色植物的光谱反射特征，随着向日葵生育期的推进，向日葵冠层光谱反射率逐渐增大，到开花期在809 nm处形成一个高的反射峰。在近红外短波范围，向日葵光谱反射率随碱化程度的减轻而增大。用红边一阶微分光谱特征参数分析，向日葵冠层反射光谱红边位置在整个生育期处于702～720 nm之间，并随着碱化程度的加重，红边位置和红边斜率呈“蓝移”现象；而在同一碱化程度水平上，随向日葵生育期的推进，红边位置和红边斜率均出现先“红移”后“蓝移”的现象。相关分析和回归分析显示，土壤碱化度、pH与红边位置均呈极显著正相关和二次多项式关系， R2值分别为0.7456和0.6153。
통과실지광보측량，연구료불동감화정도토양상향일규재불동생육기관층광보반사솔、홍변삼수급여대응적토양감화도화pH지간적관계。결과표명，불동감화정도토양상향일규생육기관층반사광보구유록색식물적광보반사특정，수착향일규생육기적추진，향일규관층광보반사솔축점증대，도개화기재809 nm처형성일개고적반사봉。재근홍외단파범위，향일규광보반사솔수감화정도적감경이증대。용홍변일계미분광보특정삼수분석，향일규관층반사광보홍변위치재정개생육기처우702～720 nm지간，병수착감화정도적가중，홍변위치화홍변사솔정“람이”현상；이재동일감화정도수평상，수향일규생육기적추진，홍변위치화홍변사솔균출현선“홍이”후“람이”적현상。상관분석화회귀분석현시，토양감화도、pH여홍변위치균정겁현저정상관화이차다항식관계， R2치분별위0.7456화0.6153。
The relationship between alkalinity and pH of the soil ,reflectance spectra and red-edge parameters of the sunflower canopy in different growth periods under different alkalinity soil were analyzed ,respectively .The results showed that the spec-tral reflectance of the sunflower canopy in different stage under different alkalinity soil is the same as the spectral reflectance characters of the other greenery canopy .Along with the advancement of the sunflower growth period ,sunflower canopy spectral reflectance increases gradually at different stages ,the spectral reflectance is higher at flowering stage than 7-leaf stage and bud-ding stage ,and there exists a high reflection peak at 809nm at flowering period .At the same time ,the spectral reflectance is af-fected by salinity-alkalinity stress at different stages ,in the near infrared shortwave band ,the spectral reflectance of the sun-flower canopy in different stage increases with the decreases in soil alkalinity .When the derivatives are applied to determine the wavelength of the red-edge ,there is a shift phenomenon of the red edge .The red edges were at 702~ 720 nm during every growth period of the sunflower .The“blue shift”phenomenon is also emerged for red edge position and red edge sloped with the increase in the soil alkalinity .Conversely ,at the same growth periods ,the red edge positions and red edge slope move to longer wave bands with the decrease in soil alkalinity .There is a“red shift”phenomenon before flowering period and“blue shift” phe-nomenon after flowering period for the red edge position and red edge slope of canopy spectrum at the same soil alkalinity .Re-spectively .The red edges at different growth stages of the sunflower show very significant positive correlation and quadratic pol-ynomial to alkalinity and pH of the soil .Therefore ,we thought used the red edge features of greenery could indicate the soil al-kalization degree ,it providing scientific basis for monitoring soil alkalization degree by remote sensing .