| 番茄不同生育阶段遮荫对光合作用与产量的影响 |
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| 引用本文： | 刘贤赵,康绍忠.番茄不同生育阶段遮荫对光合作用与产量的影响[J].园艺学报,2002,29(5):427-732. |
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| 作者姓名： | 刘贤赵 康绍忠 |
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| 作者单位： | ( 烟台师范学院地理与旅游系, 烟台264025; 中国科学院水利部水土保持研究所, 杨凌712100; 西北农林科技大学水利与建筑工程学院, 杨凌712100) |
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| 基金项目： | 国家自然科学青年基金项目 ( 410 710 0 5 )，国家杰出青年科学基金项目 ( 4972 5 10 2 )，烟台师范学院博士引进基金项目，西北农林科技大学青年专项基金项目 (B2 0 0 10 8)，973项目 (G19990 1170 8) |
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| 摘 要： | 研究了番茄夏季不同生长阶段午间遮荫对光合作用、干物质分配和产量构成的影响。结果表明,不同时期遮荫使番茄初花期、盛花期和末花期午间气孔导度(Gs) 和胞间CO2 浓度(Ci) 增加, 75%遮荫显著降低净光合速率(Pn) , 但盛花期中度遮荫( 40%遮荫) 的Pn 随着遮荫时间的增加逐渐上升, 在末花期阶段表现尤为明显, 8 d 平均Pn 比对照增加22%, 蒸腾速率也显著增加。在初花和盛花期, 重度遮荫( 75% 遮荫) 显著降低根、茎干样质量, 但中度遮荫使末花期的根、茎干样质量分别比对照( 不遮荫) 增加43%和22%, 叶干样质量的增加不明显。初花期遮荫对果实产量影响不明显, 但盛花期75%遮荫的总产量和有效产量显著降低; 在末花期, 与对照相比, 40%的遮荫使总产量和有效产量显著增加, 单果质量亦增加35%。这些结果表明, 末花期午间适度遮荫有利于提高光合作用, 增加干样质量和经济产量。
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| 关 键 词： | 遮荫 番茄 不同生长阶段 光合作用 产量 |
| 文章编号： | 0513-353X(2002)05-0427-06 |
| 修稿时间： | 2001年9月10日 |
Effects of Shading on Photosynthesis and Yield of Tomato Plants at Different Growth Stages |
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| Liu Xianzhao , and Kang Shaozhong.Effects of Shading on Photosynthesis and Yield of Tomato Plants at Different Growth Stages[J].Acta Horticulturae Sinica,2002,29(5):427-732. |
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| Authors: | Liu Xianzhao and Kang Shaozhong |
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| Institution: | (Department of Geography and Tourism, Yantai Normal University , Yantai 271000, China ; Institute of Soil and Water Conservation , ChineseAcademic of Sciences, Yangling 712100, China ; Northwest Science and Technology University of Agriculture and Forestry, Yangling 712100, China ) |
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| Abstract: | This paper studied the effects of three levels of shading (no shading, 75% shading and 40% shading) for 8 days on tomato leaf photosynthesis, drymatter partitioning and yield formation at three growth stages 1i. e. early flowering (EF) , peak flowering (PF) , late flowering (LF) 2. Different effects caused by shading at different growth stages were found. Shading caused a higher increase in stomatal conductance and intercellular CO2 concentration at all three growth stages compared with unshaded plants, significantly reduced the midday net photosynthetic rates at most days of the EF stage, but the photosynthetic rates in 40%2shaded leaves at PF stage were increased gradually depending on the length of the shading time. This trend become more obvious and the average photosynthetic rates during a 82day shading period in 40% shading treated leaves was increased by 22% atthe LF stage. The 75% shading treatment reduced the drymass of root and stem tissues at the EF and PF stages, while the 40% shading region increased root dry mass and stem dry mass by 43% and 22% compared with the unshaded treatment at the LF stage. The influence of shading on the dry mass of leaves was very small at most growth stages. A 40% shading treatment at the LF stage significantly enhanced the fruit yield, but failed to affect the fruit yield at the EF stage. The results showed that tomato could growwell and a better yield could be obtained if some moderate shading ( i. e. 40% shading) was applied at the LF stage in the summer midday time. |
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| Keywords: | Shading Tomato Different growth stages Photosynthesis Yield |
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