靳新红, 王百田, 郭红艳, 武晶, 廖行. 黄土半干旱区枣、榆水分利用效率的比较研究[J]. 中国生态农业学报(中英文), 2009, 17(1): 90-93. DOI: 10.3724/SP.J.1011.2009.00090
引用本文: 靳新红, 王百田, 郭红艳, 武晶, 廖行. 黄土半干旱区枣、榆水分利用效率的比较研究[J]. 中国生态农业学报(中英文), 2009, 17(1): 90-93. DOI: 10.3724/SP.J.1011.2009.00090
JIN Xin-Hong, WANG Bai-Tian, GUO Hong-Yan, WU Jing, LIAO Hang. Comparison of water use efficiency of Zizyphus jujube and Ulmus pumilain semi-arid zones of the Loess Plateau[J]. Chinese Journal of Eco-Agriculture, 2009, 17(1): 90-93. DOI: 10.3724/SP.J.1011.2009.00090
Citation: JIN Xin-Hong, WANG Bai-Tian, GUO Hong-Yan, WU Jing, LIAO Hang. Comparison of water use efficiency of Zizyphus jujube and Ulmus pumilain semi-arid zones of the Loess Plateau[J]. Chinese Journal of Eco-Agriculture, 2009, 17(1): 90-93. DOI: 10.3724/SP.J.1011.2009.00090

黄土半干旱区枣、榆水分利用效率的比较研究

Comparison of water use efficiency of Zizyphus jujube and Ulmus pumilain semi-arid zones of the Loess Plateau

  • 摘要: 在黄土半干旱区, 采用人工控制水分的方法, 选择生长良好的枣树和榆树幼树, 在晴天利用LI一6400便携式光合作用测定系统对其净光合速率、蒸腾速率、气孔导度进行了测定, 并应用遮荫法测定不同太阳有效辐射下净光合速率、蒸腾速率, 比较其水分利用效率。结果表明:不同土壤水分条件下, 枣树和榆树的净光合速率日变化明显不同, 枣树变化幅度大于榆树, 枣树对水分的利用效率高于榆树。对枣、榆幼树连续时间内日蒸散量的测定结果表明, 影响蒸散量的主要因素是土壤含水量, 枣树耗水能力高于榆树, 但当土壤含水量升高时枣树耗水能力反而降低, 相对于枣树而言黄土半干旱区更有利于榆树生长。

     

    Abstract: In semi-arid regions of the Loess Plateau,Zizyphus jujube and Ulmus pumila samples were selected to study the net photosynthetic rate, transpiration rate and stomatal conductance using LI-6400 portable photosynthesis machine under different controlled soil water contents. Net photosynthetic and transpiration rates were observed under controlled solar radiation intensity through shading to determine water use efficiency. The results show obvious differences in the daily processes of net photosynthetic rate between Z. jujube and U. pumila under different soil water contents. The daily range of change in net photosynthetic rate and water use efficiency for Z. jujube is higher than that for U. pumila. Analysis of continuous daily transpiration rates show that soil water is a major influencing factor of evapotranspiration. Z. jujube has a higher water-consumption rate which decreases at high soil moistures. Therefore U. pumila is more suitable to semi-arid conditions of the Loess Plateau regions than Z. jujube .

     

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