土壤水分对柽柳叶片荧光特性及光合特性的影响
首发时间:2010-03-30
摘要:采用L i-6400光合仪、PAM-2100叶绿素荧光仪分析研究了不同土壤水分下柽柳的光合特性和叶绿素荧光特性的变化特征。结果表明:(1)严重水分胁迫(30-40%)和轻度水分胁迫(50-60%)下,柽柳叶绿素含量增加。(2)轻度水分胁迫(50-60%)与对照(70-80%)相比叶绿素荧光特性差异不大;但严重水分胁迫下则表现出Yield、 FV/FM、qP 显著降低;qN、Fo 升高等一系列的逆境反映。(3)轻度水分胁迫(50-60%)与对照(70-80%)的光合速率差异不大,气孔导度均随着光照强度的增加呈线性增加;严重干旱下(30-40%)柽柳光合速率受到严重抑制,蒸腾速率降低,气孔导度变化不规律,但水分利用效率最高。
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Effects of Soil Water content on the Photosynthesis Characteristics and Chlorophyll Fluorescence Parameters of Tamarix cheinese
Abstract: In this paper, Li-6400 photosynthesis system and PAM-2100 chlorophyll fluoro-meter were used to measure the photosynthesis characteristics and chlorophyll fluorescence parameters of Tamarix cheinese under different soil water content. The result shows: (1) Tamarix cheinese under heavy water stress(30-40%RWC) has higher chlorophylls contents than CK and LS.(2) Tamarix cheinese under low water stress (50-60%RWC)has no obvious difference with CK (70-80%RWC)in chlorophyll fluorescence parameters, but under heavy water stress, Yield , Fv/Fm, qP were significant lower than CK. qN was significant higher than CK. This means Tamarix cheinese suffer a heavy drought stress. (3) There is little difference between CK and LS in photosynthetic rate, stomatal conductance shows a linearly increase with the light intensity; while under heavy water stress, the photosynthetic rate was severely inhibited, the transpiration rate decreased and the stomatal conductance is not changing in law, but the water use efficiency is the highest.
Keywords: soilwatercontents Chlorophyllcharacteristic photosynthesisrate wateruse efficiency
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