不同株型水稻叶倾角群体分布的模拟

 以株型因子为参数，建立了不同株型品种水稻叶倾角分布模型。对该模型进行验证，模拟值与实测值的1∶1回归直线的R2和RMSE分别为0.9472和3.93%。用本模型对3种株型、6个冠层高度和7个生长期的水稻冠层叶倾角分布的模拟结果表明，3种株型水稻叶倾角分布不同，紧凑株型的两优培九叶倾角较大，叶片挺立；松散株型的汕优63叶倾角最小，叶片披垂；中间型两优Y06介于两者中间，与实际观察结果一致。同一品种7个生长期叶倾角分布不同，从分蘖期到孕穗期，冠层叶倾角逐渐变大，叶片逐渐挺立；从孕穗期到成熟期，两优培九叶倾角变化不明显，汕优63和两优Y06则逐渐变小，叶片逐渐披散，其中，汕优63尤为明显。同一品种相同生长期的 6个冠层高度叶倾角分布不同，随着冠层高度增加，3个品种的分层LAI均减小，两优培九叶倾角变化不大，汕优63逐渐增大，两优Y06逐渐减小。试验证明该模型具有良好实用性。

Simulation of Leaf Inclination Angle Distribution for Rice with Different Plant Types

A model for simulating leaf inclination angle distribution was established by the plant type factors of three plant types,and validated by the present experiment.The coefficient of determination(R2) and the root mean square error(RMSE)between the simulated and measured values are 0.9472 and 3.93%,respectively.The simulation results of the model showed that there was different distribution of leaf inclination angle in the three plant types.The leaf inclination angle of compact plant type,Liangyoupeijiu (erect leaves) is larger than a loose plant type,Shanyou 63(droopy leaves) and intermediate type,Liangyou Y06.Shanyou 63 showed the lowest inclination angle of leaf which is consistent with the observation.For a variety,there was also different leaf inclination angle distribution at the seven growth stages.Canopy leaf inclination angle became larger and larger from transplanting to booting stage.After booting,with the advance of growing,leaf inclination angle of Shanyou 63 and Liangyou Y06 was getting larger,while Liangyoupeijiu showed little change.Canopy leaf inclination angle distribution at six heights showed different for a material at a growth stage.With the increase of canopy height,layered leaf area index decreased in the three plant types,and the leaf inclination angle of Liangyoupeijiu showed little change.However,with the increase of canopy height,leaf inclination angle was getting larger for Shanyou 63,and much smaller for Liangyou Y06.The present model proved that simulation results of the model come very close to the actual values.