基于传输过程的水稻冠层辐射平衡及光能利用模拟研究

Quantitative simulation of different bands of light radiation in canopy transmission, absorption and utilization is help to clarify the absorption and utilization mechanism of light radiation in rice. In this study, by conducting field experiments with different varieties, different density, different nitrogen levels, the temporal and spatial variation of rice canopy structure index and different bands of light radiation will be studied, then the quantitative relationship of spectral reflectance and the structure parameters, and the prediction model for rice canopy vertical structure parameter will be developed. Using hierarchical modeling method, improved radiation transmission model, the radiation balance model based on radiative transfer process will be established when the input parameter is provided by the developed canopy vertical structure parameters model. Further based on the canopy radiation balance model, the published radiation use efficiency model will be combined and improved to develop the rice light utilization model. The results will contribute to achieve the analysis of rice canopy photosynthetic production of light energy utilization and to know the path and potential to clearly improved rice canopy light use. The results would also have great significance in evaluating rice canopy light use with different planting conditions, rice plant type breeding, promoting rice production.

定量模拟不同波段光辐射在水稻冠层的传输、吸收和利用过程，有利于明确水稻对光辐射吸收利用的机理。本研究通过实施不同株型品种、不同密度、不同氮素水平的水稻田间试验，在阐明水稻冠层结构指标和不同波段光辐射的时空变化规律基础上，研究明确光谱反射率与这些结构参数的定量关系，建立水稻冠层垂直结构参数预测模型。采用分层建模的思想，改进已有辐射传输模拟模型，以构建的冠层垂直结构参数预测模型提供分层结构输入参数，建立基于辐射传输过程的辐射平衡模型；进一步在冠层辐射平衡模型的基础上，结合并改进辐射利用效率模型，构建水稻光能利用模型。从而实现水稻冠层光能利用和光合生产动态关系的定量分析，明确提高水稻冠层光能利用的路径和潜力。研究结果对评价不同种植条件下水稻冠层光能利用、水稻株型育种、促进水稻生产有重要意义。

模拟不同光质辐射在水稻冠层的传输、吸收和利用过程，有助于明确水稻对光辐射吸收利用的机理。本研究通过实施不同株型品种、不同密度、不同氮素水平的水稻田间试验，阐明了水稻冠层结构指标和不同波段光辐射的时空变化规律，研究明确了光谱反射率与这些结构参数的定量关系，建立了水稻冠层垂直结构参数预测模型。同时，改进已有辐射传输模拟模型，建立了基于辐射传输过程的辐射平衡模型；进一步结合辐射利用效率模型，构建了水稻光能利用模型，从而实现了水稻冠层光能利用和光合生产动态关系的定量分析。研究结果对评价不同种植条件下水稻冠层光能利用、水稻株型育种、促进水稻生产有重要意义。