| 不同浇水量对毛乌素沙地沙柳幼苗气体交换过程及其光化学效率的影响 |
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| 引用本文： | 肖春旺,周广胜.不同浇水量对毛乌素沙地沙柳幼苗气体交换过程及其光化学效率的影响[J].植物生态学报,2001,25(4):444-450. |
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| 作者姓名： | 肖春旺 周广胜 |
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| 作者单位： | 中国科学院植物研究所 |
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| 基金项目： | 国家重点基础研究专项经费(G1999043407)、中国科学院知识创新工程项目(KSCX 2-1-07)和基金委 "九*五”重点项目(49835010) |
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| 摘 要： | 利用毛乌素沙地优势灌木沙柳(Salix psammophila)幼苗，研究气体交换及其PSⅡ的光化学效率对4种浇水量响应。结果表明：不同浇水量明显影响沙柳幼苗净光合速率、蒸腾速率、气孔导度、胞间CO2浓度和叶片温度日变化动态；除幼苗叶片温度随着浇水量的增加而降低外，其它以上因素均随浇水量的增加而增大。浇水量少时，幼苗净光合速率明显有“午睡”现象，而充足浇水能有效消除幼苗净光合速率的“午睡”现象；浇水量增加降低了沙柳幼苗光补偿点，提高了饱和光强和表观量子效率；浇水量显著影响幼苗的PSⅡ光化学效率，随着浇水量减少，幼苗的最大荧光、可变荧光、最大荧光比和最大光化学效率逐渐减小。相关分析反映了在不同施水量处理下，环境因子光合有效辐射、大气温度、大气饱和水汽压差及其生理变量气孔导度、叶片温度、胞间CO2浓度均显著影响幼苗净光合速率。
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| 关 键 词： | 浇水量 毛乌素沙地 沙柳 气体交换 光化 |
| 修稿时间： | 2000年9月6日 |
EFFECT OF DIFFERENT WATER SUPPLY ON GAS EXCHANGE PROCESSES AND PHOTOCHEMICAL EFFICIENCY IN SALIX PSAMMOPHILA SEEDLINGS IN THE MAOWUSU SANDLAND |
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| XIAO Chun,Wang and ZHOU Guang,Sheng.EFFECT OF DIFFERENT WATER SUPPLY ON GAS EXCHANGE PROCESSES AND PHOTOCHEMICAL EFFICIENCY IN SALIX PSAMMOPHILA SEEDLINGS IN THE MAOWUSU SANDLAND[J].Acta Phytoecologica Sinica,2001,25(4):444-450. |
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| Authors: | XIAO Chun Wang and ZHOU Guang Sheng |
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| Abstract: | The effect of four different water supply levels on the gas exchange processes and photochemical efficiency in PS Ⅱ were investigated in seedlings of Salix psammophila, a dominant shrub in the Maowusu arid sandy region. Increasing water supply levels had a strong influence on diurnal changes in photosynthetic rate, transpiration rate, stomatal conductance, intercellular CO2 concentration (all increasing ) and leaf temperature (decreasing) of the seedlings. The photosynthetic rate of seedlings showed a strong midday depression under low water supply but not under full water supply. Increasing water supply decreased the light compensation point and enhanced the saturation light and apparent quanta efficiency. Water supply significantly influenced photochemical efficiency in PS Ⅱ: maximal fluorescence, variable fluorescence, maximal fluorescence ratio and maximal photochemical efficiency all decreased with declining water supply. Correlation analysis showed that meteorological variables, such as photosynthetic active radiation, air temperature, air saturated water vapour pressure difference, and physiological variables, such as stomatal conductance, leaf temperature, intercellular CO2 concentration, significantly affected the photosynthetic rates of the seedlings under varying water supply conditions. |
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| Keywords: | Water supply Maowusu sandland Salix psammophila Gas exchange Photochemical efficiency |
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