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综合已有作物模型(包括冠层结构、冠层光分布和冠层光合作用与干物质生产模型)的优点,构建了双季稻光合生产模型.利用独立的田间试验资料,对冠层内的光分布和干物质积累量进行了初步检验;利用模型定量分析了直接辐射在上挺下挺、上挺下披和上披下披3种典型株型水稻冠层内水平面上和叶面上的分布、冠层日光合量及其随叶面积指数的变化特征.结果表明:模拟值与观测值之间具有较好的一致性,预测双季稻冠层内光分布的根均方差、相对根均方差和相关系数分别为12.01 J·m~(-2)·s~(-1)、8.2%和0.9929;预测双季稻干物质积累量的根均方差、相对根均方差和相关系数分别为0.83 t·hm~(-2)、14.6%和0.9772,表明模型预测性较好;上挺下披株型水稻的冠层日光合量最高,取决于较大的叶面受光量、叶片光合效能和叶面积指数.
Based on the advantages of existing crop models (including canopy structure, canopy light distribution and canopy photosynthesis and dry matter production models), a photosynthetic model of double cropping rice was constructed.Using independent field data, Light distribution and dry matter accumulation. The model was used to quantitatively analyze the effects of direct radiation on the horizontal and the foliage of three typical plant type rice canopy, Distribution, canopy photosynthetic rate and its variation with leaf area index.The results showed that there was a good agreement between the simulated values and the observed values, the root mean square error of the light distribution in the canopy of double cropping rice, relative root The mean square error and correlation coefficient were 12.01 J · m -2 · s -1, 8.2% and 0.9929, respectively. The root mean square error, relative root mean square error and correlation coefficient of dry matter accumulation in double cropping rice were respectively predicted 0.83 t · hm -2, 14.6% and 0.9772, respectively, indicating that the model has good predictability. The highest photosynthetic rate of canopy on the top and down canopy depends on the amount of light received by the leaves, Efficiency and leaf area index.