| 土壤水分对异株荨麻光合作用的影响 |
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| 引用本文： | 何斌,刘勇. 土壤水分对异株荨麻光合作用的影响[J]. 安徽农业科学, 2011, 39(35): 21719-21721,21731 |
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| 作者姓名： | 何斌 刘勇 |
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| 作者单位： | 1. 毕节学院地理与生命科学学院,贵州毕节,551700
2. 北京林业大学省部共建森林培育与保护教育部重点实验室,北京,100083 |
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| 基金项目： | 国家科技部星火计划项目"生态建设与经济林果栽培技术与科技示范"，贵州省教育厅自然科学研究项目 |
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| 摘 要： | 采用盆栽和人工控制土壤水分的方法,使用LI6400便携式光合测定系统观测了5种土壤水分条件下异株荨麻光合生理生态特征的日变化。结果表明：在不同土壤水分状况下,异株荨麻净光合速率日变化曲线均呈＂双峰＂型,并有不同程度的＂午休＂现象,随着土壤水分的升高,最高值从下午17：00提前到上午的9：00;蒸腾速率和气孔导度日变化具有较好的协同性,也呈＂双峰＂型,大小顺序依次为T3处理〉T2处理〉T1处理〉T4处理〉T5处理;水分利用效率最高值出现在上午较早的时段,且上午的水分利用效率明显高于下午。
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| 关 键 词： | 异株荨麻 土壤水分 光合作用 日变化 |
Effect of Soil Moisture on Photosynthesis of Urtica dioica L. |
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| Affiliation: | HE Bin et al(School of Geography and Life Science,Bijie University,Bijie,Guizhou 551700) |
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| Abstract: | Under pot planting and water controlling condition,the diurnal variations of photosynthetic characteristics of Urtica dioica L.were measured under 5 different soil water conditions using Li26400 portable photosynthesis system.The results showed that the diurnal course of net photosynthetic rate was displayed in a two peak pattern with a typical midday depression pattern under different drought stress.The maximum value of net photosynthetic rate appeared from 17:00 to 9:00 with the increase of soil moisture.Coordination existed Between daily change process of transpiration rate and daily change process of stomatal conductance in Urtica dioica L.and a two peak course was displayed.The order of T3> T2> T1 >T4>T5 was founded in Tr and Gs.The water use efficiency culminated in the early morning.And the water use efficiency in forenoon was higher than that in afternoon. |
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| Keywords: | Urtica dioica L. Soil moisture Photosynthesis Daily variation |
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