论文部分内容阅读
作物间套作群体冠层中叶片水平向和垂向分布的不均匀性给其光能截获的连续测定带来了很大困难.为了量化小麦/玉米套作群体不同生长阶段的光能吸收,本文建立了模拟该套作群体光合有效辐射(PAR)瞬时传输的几何模型,并用大田实测值对模型进行验证.结果表明:几何模型可有效地模拟小麦/玉米套作群体冠层底部的PAR强度.小麦/玉米62套作(I62)群体模型估算结果与实测值的线性回归方程的决定系数为0.947,小麦/玉米124套作(I124)群体模拟结果与实测值的线性回归方程的决定系数为0.950.2012和2013年I62套作群体截获的PAR分别为1061.4和924.3 MJ·m-2,在所有处理中最高.2012年I62和I124套作群体相对于单作的PAR截获比率分别为1.29和1.19,2013年I62和I124套作群体相对于单作的PAR截获比率分别为1.21和1.16.
Inter-crop canopy inter-group canopy leaf horizontal and vertical distribution of inhomogeneities for its light energy intercepted continuous determination has brought great difficulties.In order to quantify the wheat / corn intercropping groups of different growth stages of light energy absorption, In this paper, a geometric model was established to simulate the transient transmission of photosynthetically active radiation (PAR) and the field test results were used to validate the model.The results show that the geometric model can effectively simulate the PAR intensity at the bottom of canopy The linear regression equation of the linear regression equation between estimated and measured values of wheat / maize 62 intercropping (I62) population model was 0.947 and the linear regression equation of simulated results and measured values of 124 wheat / maize intercropping (I124) With a coefficient of determination of 0.950.2012 and intercepted PARs of 1062.4 and 924.3 MJ · m-2, respectively, in the I62 intercropping population in 2013, which was the highest among all treatments.The PAR interception rate of I62 and I124 intercropping population Respectively 1.29 and 1.19, the interception rates of PAR of I62 and I124 in 2013 compared with those of monocarsling were 1.21 and 1.16, respectively.