| 摘要: |
| 【目的】研究日光温室番茄群体的太阳总辐射量分布规律，为优化日光温室结构、控制日光温室环境提供理论依据。【方法】将日光温室番茄冠层按高度均匀分为4层，观测不同冠层的太阳总辐射量、叶面积指数、净光合速率和太阳总辐射透光率，探讨群体太阳总辐射量的变化规律及其与光合作用的关系。【结果】在番茄盛果期，日光温室内的太阳总辐射量南部明显高于北部，平均高出200 W/m2以上；中部略高于东、西部。太阳总辐射量在植株群体内垂直方向上随冠层高度的下降而减少，1.2，0.9，0.6 和 0.3 m冠层的太阳总辐射量日平均值分别为507，398，289 和 76 W/m2；越靠近冠层底部太阳总辐射量衰减的日变化越不明显。随着冠层高度的降低，累积叶面积指数增大，太阳总辐射量减小。净光合速率由冠层顶部向底部表现为随累积叶面积指数的增加而降低，随着太阳总辐射透光率的减少而减小，冠层顶部净光合速率最大，为22.59 μmol/(m2·s)，冠层底部最小，为8.00 μmol/(m2·s)。【结论】日光温室中番茄群体太阳总辐射量的分布规律为：南部高于北部，中部略高于东、西部；太阳总辐射量分布与冠层高度、累积叶面积指数和净光合速率均有一定的相关性。 |
| 关键词: 日光温室 番茄 太阳总辐射量 累积叶面积指数 净光合速率 |
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| 基金项目:国家自然科学基金项目(31000921)；国家科技支撑计划项目(2008BADA6B01);沈阳市科技计划项目（1081198-3 00） |
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| Solar radiation distribution and relationship between solar radiation and photosynthesis of tomato canopy in solar greenhouse |
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| Abstract: |
| 【Objective】An experiment on tomato was conducted to study solar radiation (SR) distribution regulation among tomato canopy in solar greenhouse.The objective was to provide theoretical foundation for optimizing structure and controlling environment of solar greenhouse.【Method】According to the height of tomato canopy in the solar greenhouse,it was divided into 4 layers.The SR,leaf area index (LAI),net photosynthetic rate (Pn) and transmittance of SR at different canopies were measured.The regulation of SR in tomato group was explored.【Result】SR in south of solar greenhouse was higher than that of north with an average higher more than 200 W/m2 and that of middle was slightly higher than that of east and west at high production period of tomato.The vertical direction of SR was reduced with the decrease of canopy height,and the daily average of SR was respectively 507,398,289 and 76 W/m2 at the canopy heights of 1.2,0.9,0.6 and 0.3 m.And the closer to the bottom,the less obvions daily changes of SR reducing were.The cumulated LAI increased and SR was decreased with the reduced of canopy height.Pn decreased with the increase of cumulated leaf area index from the top to bottom of tomato canopy and with reducing of the transmittance of SR,in which Pn was 22.59 μmol/（m2·s） at the top and 8.00 μmol/（m2·s） at the bottom.【Conclusion】SR distribution of tomato canopy in solar greenhouse was that SR of south was higher than that of north,that of middle was slightly higher than that of east and west.SR distribution was also largely related with LAI of canopy height and Pn. |
| Key words: solar greenhouse tomato global solar radiation cumulated LAI photosynthetic rate |
