| 玉米冠层内光合有效辐射三维空间分布的测定和分析 |
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| 引用本文： | 王锡平,李保国,郭焱,翟志席.玉米冠层内光合有效辐射三维空间分布的测定和分析[J].作物学报,2004,30(6):568-576. |
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| 作者姓名： | 王锡平 李保国 郭焱 翟志席 |
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| 作者单位： | 中国农业大学资源与环境学院/植物-土壤相互作用教育部重点实验室,北京100094 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家高技术研究发展计划(863计划)，国家自然科学基金 |
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| 摘 要： | 设计了一套田间观测试验，以测定光合有效辐射（PAR，Photosynthetic Active Radiation）在玉米冠层内三维空间上的分布规律。对实测资料的分析得出如下结论：（1）玉米冠层内平均PAR的垂直分布具有随着向下累计叶面积指数的增加而指数递减的趋势。在冠层中上部，PAR透光率较高，递减很明显，冠层下部则维持较低水平，变化不
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| 关 键 词： | 玉米 PAR 三维空间分布 光斑 作物冠层 |
| 收稿时间： | 2003-03-10 |
| 修稿时间： | 2003年3月10日 |
Measurement and Analysis of the 3D Spatial Distribution of Photosynthetically Active Radiation in Maize Canopy |
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| WANG Xi Ping ,LI Bao Guo ,GUO Yan ,ZHAI Zhi Xi.Measurement and Analysis of the 3D Spatial Distribution of Photosynthetically Active Radiation in Maize Canopy[J].Acta Agronomica Sinica,2004,30(6):568-576. |
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| Authors: | WANG Xi Ping LI Bao Guo GUO Yan ZHAI Zhi Xi |
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| Institution: | Key Laboratory of Plant-Soil Interactions, Ministry of Education, College of Key Laboratory of Plant-Soil Interactions, Ministry of Education, College of Resources and Environmental Science, China Agricultural University, Beijing 100094 |
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| Abstract: | An experiment to measure the 3D PAR (Photosynthetically Active Radiation) distribution in maize canopy was designed. The following results have been achieved through 3D PAR analysis from this experiment. (1) The averaged PAR at different depths in maize canopy was decreased with the increase of accumulated LAI by exponential law. The decrease trend of PAR transmittance of maize canopy was very similar for different density at same time and weather. But the extinction coefficient varied evidently with different weather and different sunshine angle even for the same canopy. (2) There were much more flecks of sunlight in upper canopy. The PAR transmittance in the flecks was high and varied very slightly. Within the lower canopy, the averaged PAR was very low and there were very few flecks of sunlight. The maximum PAR transmittance was also very low. (3) Lower maize planting density would increase flecks of sunlight and PAR transmittance evidently in canopy bottom. (4) PPFD (Photosynthetic Photon Flux Density) and maximum PAR transmittance in maize canopy was badly decreased in cloudy days. This study might provide some references for the simulation of 3D light distribution and experiment design of 3D light measurement in crop canopy. |
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| Keywords: | PAR |
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