不同株型水稻冠层内光分布的模拟研究  

Simulative Study on the Light Distribution in Rice Canopy with Different Crop Type

作　　者：刘寿东[1] 张富存[1] 胡凝[1] 刘娟[1] 

机构地区：[1]南京信息工程大学应用气象学院,江苏南京210044

出　　处：《安徽农业科学》2008年第11期4375-4378,4385,共5页Journal of Anhui Agricultural Sciences

摘　　要：[目的]对不同株型水稻冠层结构、冠层内光分布和光合作用之间的定量化关系进行了模拟计算研究。[方法]采用双参数椭圆函数和Beer-Lambert光传播定律分直射光和散射光对作物的冠层结构和光分布进行了数值模拟。[结果]函数模拟值与实测值的曲线变化趋势一致。两优培九的模拟值与实测值变化较为一致。但是汕优63无论是直射光还是散射光,均表现为在冠层上方实测值比模拟值大,而在冠层下方模拟值比实测值大。通过对消光系数的模拟研究表明,9:00～17:00两优培九直射光消光系数要比汕优63平均小0.45,而散射光消光系数两优培九为0.34,汕优63为0.38。[结论]在一定环境下,作物叶倾角分布密度的差异程度决定了冠层光分布差异的大小,因此,将消光系数视为常数是不适当的;可以在冠层光分布模型的基础上进一步建立冠层光合作用的数值模型,进而估算作物的生产潜力,为作物育种与栽培提供科学依据。[Objective] A simulation and calculation study on the relationships among canopy architecture, canopy light distribution and photosynthesis with different crop type. [Method] Using double parameter ellipse function and Beer-Lambert ray diffuse law, the canopy architecture and light distribution were studied respectively. [Result] The results showed that function measurement value and simulation value of Liangyoupei9 and Shanyou63 had the same trend, The measurement value and simulation value change of Liangyoupei9 was consistent. But the direct sunlight and the diffused sunlight of Shanyou63 represented that at the canopy top the measurement value was greater than the simulative value and at the canopy under layer the simulative value was greater than the measurement value. The simulation study of extinction coefficient indicated that between 9：00-17：00 the mean value of direct sunlight extinction coefficient of Liangyoupei9 wais 0.45 fewer than that of Shanyou63, but the diffused sunlight extinction coefficient of Liangyoupei9 was 0.34 and that of Shanyou63 was 0.38. [Conclusion] At the definite condition, the diversity degree of crop leaf slope angle distribution density decided the diversity of canopy sunlight distribution, so it wps wrong to see the extinction coefficient as constant. Based on the light distribution model, the canopy photosynthesis simulation model was built to estimate crop producing potential and provide scientific warranty for crop breeding and planting.

关 键 词：水稻 冠层结构 光分布 数值模拟 

分 类 号：S511[农业科学—作物学]