| Dynamic simulation of spring wheat leaf area index in Ningxia irrigable area |
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| DOI：10.7606/j.issn.1000-7601.2011.01.35 |
| Key Words: spring wheat LAI meteorological elements dynamic simulation normalization |
| Author Name | Affiliation | | ZHANG Xueyi | Ningxia Key Laboratory for Meteorological Disaster Prevention and Reduction, Yinchuan 750002, China
NanjingUniversity of Information Engineering, Nanjing 210044, China | | ZHANG Li | Ningxia Key Laboratory for Meteorological Disaster Prevention and Reduction, Yinchuan 750002, China | | HUANG Feng | Ningxia Key Laboratory for Meteorological Disaster Prevention and Reduction, Yinchuan 750002, China | | LIU Jing | Ningxia Key Laboratory for Meteorological Disaster Prevention and Reduction, Yinchuan 750002, China | | MA Guofei | Ningxia Key Laboratory for Meteorological Disaster Prevention and Reduction, Yinchuan 750002, China |
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| Abstract: |
| In order to realize the prediction of dynamic yield of spring wheat in Ningxia, it is necessary to obtain the key parameters of LAI. Based on the field observation data of 1994～2009 from the Ningxia Yongning agricultural experiment station, the LAI dynamical law of spring wheat was studied. Three indexes and three stages and different functions were contrasted and analized. The results indicated that the formula y=(a+bx)/(1+cx+dx2) was the best form to simulate the LAI in 3-leaf stage to heading stage, in which the physical day was used as the argument after LAI and these indexes were normalized. But the simulated results from the y=a/〔1+exp(b+cx+dx2)〕 and Richard formulas were not ideal. The simulating accuracy of 3-leaf to heading was noticeably higher than that of 3-leaf to maturity after the growth processes were divided into three stages. R2 was changed from 0.90795 to 0.95796, RMSE from 0.10359 to 0.07612, the accuracy from 0.9156 to 0.93351, the degree of accuracy from 0.9717 to 0.9848, and the α<0.001, which indicated that this mean could better obtain spring wheat LAI, which provided a powerful method for the prediction of spring wheat yield in Ningxia irrigable area. |
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