SunScan冠层分析仪在水稻叶面积指数测量中的应用

Application of SunScan Canopy Analysis System to Measure Leaf Area Index of Rice

为了研究ELADP对SunScan测量LAI的影响规律,在江西省灌溉试验中心站针对晚稻开展试验研究,试验设3种施氮水平：N0（0kg/hm2）、N1（135kg/hm2）、N2（180kg/hm2）。对比分析SunScan间接测量水稻LAI与比叶重法实测水稻LAI,对ELADP进行率定,并分析其变化规律。结果表明,从移栽到抽穗开花期,不同施氮水平下,ELADP值在0.5左右变化;N2施氮水平下,乳熟期ELADP为1.2、黄熟期为1.7;N1施氮水平下,乳熟期ELADP为1.2,黄熟期ELADP大于4,没有得到具体值;N0施氮水平下,乳熟期和黄熟期ELADP均大于4,也没有得到具体值。综合分析表明,水稻ELADP取值从移栽到抽穗开花期为0.5,乳熟期及黄熟期1.2-1.7较合适。ELADP的率定结果为用SunScan准确测量水稻LAI提供了依据。

In order to study ELADP＇s influence on LAI when it was measured by SunScan, an experiment on late rice under three nitrogen levels （NO： 0 kg/hm^2 , NI： 135 kg/hm^2 , N2.180 kg/hm^2） was conducted in Jiangxi irrigation experimental center. After the comparison of LAI which was indirectly measured by SunScan or through the specific leaf weight method, ELADP values were calibrated and how it changed was analyzed. It was concluded that ELADP value was about 0.5 under all the three nitrogen levels from the transplanting stage to the flowering stage. Under N2 level, the ELADP value of the late rice was 1.2 in milky stage and 1.7 in yellow ripeness stage; under N1 level, ELADP value was 1.2 in milky stage and over 4.0 in yellow ripeness stage; under NO, ELADP value was over 4.0 in both milky stage and yellow ripeness stage. It was indicated that ELADP value should be 0.5 from the transplanting stage to the flowering stage of the growing late rice, and range from 1.2 to 1.7 during the milky stage and yellow ripeness stage. The calibrated values of ELADP proved that SunScan canopy analysis system was able to measure LAI of rice accurately.