加工番茄红边特征参数与叶片氮积累量和叶面积指数的关系

Correlation Between Red Edge Characteristic Parameters and Leaf Nitrogen Accumulation and Leaf Area Indices of Processing Tomato

本文分析了加工番茄两品种四氮素水平关键生育时期的冠层红边特征,红边参数与其冠层叶片氮积累量(LNA)和叶面积指数(LAI)的相关性。结果表明:加工番茄的红边曲线具有双峰现象,在开花期、盛花期、坐果期,红边位置(λr)向长波方向移动了2～11nm波段,红边曲线峰值(Dr)较大,LNA和LAI较高。到红果期红边位置向短波方向移动了5～10nm波段,红边曲线峰值也较低,LNA和LAI最低,双峰现象在红果期随着施氮量的减少而减弱,说明红边位置的变化可以指示加工番茄生育时期的氮素营养状况。加工番茄2个品种冠层的λr、红边斜率(Dr)和红边面积(SDr)分别与其冠层LNA和LAI的相关性均达到了1%极显著水平,其中里格尔87-5的Dr与LNA的线性相关和SDr与LAI的指数相关最高(rDr-LNA=0.8181**,rSDr-LAI=0.9136**,n=23,α=1%),说明利用红边参数可以实时快速地获取加工番茄冠层LNA和LAI的信息,可有效监测加工番茄的氮素营养状况。

This paper analyzed of the characteristics of red edge of two varieties of processing tomatoes in four nitrogen fertilization treatments at key growing stage,the correlation between three red edge parameters and their corresponding leaf nitrogen accumulation（LNA）,leaf area indices（LAI）,respectively.The results showed that red edge curve of processing tomato had double peaks;red edge position（λr） shifted towards long wavelengths range 2～11 nm at its flower stage,full bloom stage and fruit setting stage,compared with seedling stage;the peak value of red edge curve（Dr） was higher than the other three stages,and LNA and LAI were also higher.λr shifted towards short wavelengths range 5～10 nm at its red fruit stage;the peak value of red edge curve reached lower;LNA and LAI were both the lowest,double peaks were weakened with the reduction of nitrogen fertilizer rate at red fruit stage;The shift of the red edge position indicated nitrogen nutrient status of processing tomato at the growing stage.There were significant correlations between λr,the slope of red edge（Dr）,area of the red edge（SDr） and LNA,LAI at 1%,respectively.Among all these relationships,Dr and LNA,SDr and LAI of Ligeer No.87-5 had the strongest linear relationship and the best exponential function（rDr-LNA=0.8181＊＊,rSDr-LAI=0.9136＊＊,n=23,α=1%）.It shows that red edge parameters can be used to rapidly extract the information of leaf nitrogen accumulation and leaf area indices and effectively monitor nitrogen nutrient condition of processing tomato.