河南新乡地区冬小麦叶面积指数的动态模型研究

Study on Dynamic Model of Leaf Area Index(LAI) for Winter Wheat in Xinxiang Area

为给小麦高产栽培提供理论依据，依据2004～2006年度田间试验数据，研究了新乡地区冬小麦叶面积指数变化规律，及其与有效积温的关系，并利用线性方程和Logistic曲线修正方程，分段建立了以气温估算冬小麦叶面积指数的半经验公式。结果表明，对叶面积指数和有效积温归一化后，冬小麦连续两个生长年度的相对叶面积指数动态变化与相对有效积温相关关系较好。通过对2003～2004年度冬小麦叶面积指数模拟值与实测值比较，平均绝对误差0．1572，相关系数0．98，相关达极显著水平（P〈0．01），这表明该方法可很好地反映叶面积的动态变化规律。

According to field experimental data from the Farmland Irrigation Research Institute of CAAS in 2004-2006 , the change rules of LAI for winter wheat ,as well as the relationship between the effective accumulation temperature and LAI in Xinxiang area was studied. Meanwhile, by using linear equation and modified logistic equation, a semi-empirical model was established to estimate the LAI of winter wheat based on the temperature data. The results showed that better correlation between the relative LAI and effective accumulated temperature exsited in the two continuous growth seasons of winter wheat, after the normalization of LAI and accumulated temperature. The comparison of the simulated and the observed of LAI for winter wheat in 2003-2004 showed that the mean of absolute error was 0. 1572, and the linear correlation coefficient was 0.98, which is significant at 1% level, so this model could well reflect the seasonal variation of leaf area, Finally, the problems about the estimation model were discussed.