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极端干旱区沙枣叶片气体交换特性及其对CO2浓度的响应
引用本文:马亚丽,常宗强,张芬梅,刘蔚,司建华.极端干旱区沙枣叶片气体交换特性及其对CO2浓度的响应[J].甘肃科学学报,2014,26(6):62-67.
作者姓名:马亚丽  常宗强  张芬梅  刘蔚  司建华
作者单位:1. 中国科学院寒区旱区环境与工程研究所阿拉善荒漠生态试验研究站,甘肃兰州,730000
2. 内蒙古阿拉善右旗林业局公益林办公室,内蒙古阿拉善右旗,737300
基金项目:国家科技支撑项目,国家自然科学基金项目
摘    要:以额济纳的沙枣树为研究对象,用Li-6400便携式光合测定仪和便携式荧光仪于2013年6月测定了沙枣叶片净光合速率(Pn)的日变化及不同CO2浓度下(Ca)的光反应曲线,分析了沙枣的光合日变化特征及其净光合速率(Pn)、气孔导度(Gs)和环境因子相互之间的关系,结果表明:沙枣的光合日变化呈双峰曲线,与气孔导度(Gs)、蒸腾速率(Tr)的日变化几乎相同,说明光辐射(PAR)的增强引起了沙枣光合对策的改变,光合午休可在一定程度上补偿净光合速率的降低;在光响应曲线中,沙枣叶片的净光合速率随光照强度增强而增大.在达到光饱和点后净光合速率随光照强度增强基本保持不变,且净光合速率随CO2浓度(Ca)升高而表现出逐渐增大的趋势;在不同CO2浓度下(Ca),沙枣叶片的光饱和点和表观量子效率随CO2浓度(Ca)的升高而逐渐增大,光补偿点则随CO2浓度(Ca)的升高基本保持不变,维持在65 μmol/(m2·s)左右.

关 键 词:光合速率  气孔导度  CO2浓度  光抑制  沙枣

Gas Exchange Characteristics & CO2 Concentration Response of Elaeagnus Angustifolia Leaves in Extreme Arid Regions
MA Ya-li,CHANG Zong-qiang,ZHANG Fen-mei,LIU Wei,SI Jian-hua.Gas Exchange Characteristics & CO2 Concentration Response of Elaeagnus Angustifolia Leaves in Extreme Arid Regions[J].Journal of Gansu Sciences,2014,26(6):62-67.
Authors:MA Ya-li  CHANG Zong-qiang  ZHANG Fen-mei  LIU Wei  SI Jian-hua
Institution:MA Ya-li ,CHANG Zong-qiang ,ZHANG Fen-mei ,LIU Wei ,SI Jian-bua (1, Alashan Desert Ecology Experiment and Research Station ,Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China ; 2. Alashan Youqi Forestry Bureau, Inner Mongolia ,AlashanYouqi 737300, China)
Abstract:The Li-6400 portable photosynthetic system was employed in June 2013 to measure diurnal variation of net photosynthetic rate of Elaeagnus angustifolia leaves in EJINA and light response curve in different CO2 concentrations,diurnal variation of photosynthesis and the relationship among net photosynthetic rate(Pn), stomatal conductance(Gs) and environmental factors of Elaeagnus angustifolia leaves were analyzed. The results showed that the diurnal course of net photosynthetic rate(Pn) formed a bimodal curve,being nearly identical with diurnal variation of stornatal conductance(Gs) and transpiration rate(T r). Net photosynthetic rate of Elaeagnus angustifolia leaves increased with the increase of light intensity in the light response rate curve. In different CO2 concentrations,light saturation point and apparent quantum yield increased with the increase of CO2 concentration but light compensa- tion point remained around 65 pmol/(m2 · s).
Keywords:Photosynthetic rate  Stomatal conductance  CO2 concentration  Photo-inhibition  Elaeagnus angustifolia
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