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1、S3j , aS , % , , 1 . rK=E J. S3j云烟87豫烟12。2)有理函数模型y=(a+bx)/(1+cx+dx2)具有较好的模拟效果和生物学意义, 能够很好地模拟烤烟群体相对叶面积指数随相对活动积温的变化, 决定系数为0.980 7*; 利用2015年试验数据对模型进行检验, 模拟准确度(k)均大于0.958, 精确度(R2)均大于0.95, 均方根误差RMSE均小于6.04%。3)模型参数在某些品种和施氮水平之间表现出显著差异性, 品种和施氮量主要通过调节模型参数b、c、d实现对整个模拟模型的调节。4)烤烟群体相对叶面积指数变化速率曲线呈“N”型变化, 反映了烤烟群体叶
2、面积指数的实际变化趋势。5)施氮量对模型次级参数具有调节作用, 随着施氮量增加烤烟群体平均叶面积指数、叶面积指数最大值呈增加趋势, 可作为烤烟群体叶面积指数氮素调节的重要参考指标。该模型的建立可以为烤烟群体发育动态监测以及烤烟群体叶片光合特性的提升提供理论依据和决策支持。 1oM : 烤烟; 叶面积指数; 活动积温; 施氮量; 有理函数模型 ms| : S572 DSM : A cI| : 1671-3990(2017)09-1276-11 Dynamic simulation of leaf area index of tobacco based on nitrogen effect*SHA
3、O Huifang1, LIU Zhihong1, CUI Dengke2, MU Tong1, HUANG Wuxing1, XU Zicheng1(1. College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China; 2. Baofeng Tobacco Redrying Factory of Tianchang International Co. Ltd., Pingdingshan 467400, China) Abstract: This study was set up to c
4、larify the dynamic characteristics of leaf area index of flue-cured tobacco under different nitrogen levels and the relationship with accumulated temperature. The leaf area index and dynamic characteristics of three flue-cured tobacco cultivars (YU12, QIN96 and YUN87) were measured under different n
5、itrogen levels (0 kghm2, 30 kghm2, 60 kghm2and 90 kghm2) to improve photosynthetic structure of flue-cured tobacco. Using the Curve Expert 1.40 software and the limit method, the normalized accumulated temperature model was established. The result indicated that: 1) A unimodal curve between leaf are
6、a index and accumulated temperature was observed after transplanting of flue-cured tobacco, 9 Y : rK=E 1277 http:/ with a skewness less than 0. Leaf area index of flue-cured tobacco increased with increasing nitrogen level, and the peak value of leaf area index was in the order of QIN96 YUN97 YU12 a
7、t the same nitrogen level. 2) The rational function model y = (a+bx) / (1+cx+dx2) yielded the best simulation result of leaf area index change with relative active accumulated tempera-ture with high precision level (R2= 0.980 7*). The accuracy and precision of the normalized model were tested with d
8、ata for 2015, and the simulation accuracy (k) was all above 0.958, the precision (R2) all above 0.95 and RMSE below 6.04%. 3) There were significant differences among some varieties and nitrogen levels, showing that variety interaction with nitrogen level mainly changed the model values of b, c and
9、d. 4) The velocity of relative leaf area index change during the growing period showed trends in N curve, reflecting the actual variability of leaf area index. 5) Secondary indexes were more sensitive to different nitrogen levels. The mean leaf area index and maximum leaf area index increased with i
10、ncreasing nitrogen level. These characteristic indexes of leaf area index could be served as a reference base for the regulation of plant nitrogen of flue-cured tobacco population. The model provided theoretical basis and decision support for monitoring growth dynamics and photosynthetic characteris
11、tics of flue-cured tobacco population. Keywords: Flue-cured tobacco; Leaf area index; Active accumulated temperature; Nitrogen application level; Rational func-tion model =T;Ta-T#121, ?VQL.+rq2-3b;TT$ , =T1? , T8;T#3V1Y4-5b= (leaf area index, LAI)816, vlQT?;T , ;vS16; LAIMyB , _ErTzbf17;_ LAI , ss*Z
12、EV4LAI Q , sYr 0.938 0.889bYT=913y0B18-19, 7-1 LAI 3y0M7nbfr13y8;S=3 , K4BHSobKTB+yT , $l , OsQl , InK-M , iIn7Sl LAI M , BKbyN , yK3= LAI VgK8?4G%bBK LAI M?p , HBK3?VpM , 9M?T , IT1LAI E , MBBZE20M1M , yM/K8M LAI 1 , YVse/K8 LAI +#+M , )K8 LAI +ETKBW3SrmVbTK8;r?#K3VS1ilb 1 材料与方法 1.1 k k 2015M 2016M28
