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首页> 外文期刊>Ecological research >Diurnal variations of chlorophyll fluorescence and CO_2 exchange of biological soil crusts in different successional stages in the Gurbantunggut Desert of northwestern China
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Diurnal variations of chlorophyll fluorescence and CO_2 exchange of biological soil crusts in different successional stages in the Gurbantunggut Desert of northwestern China

机译：西北古尔班通古特沙漠不同演替阶段生物土壤结皮的叶绿素荧光和CO_2交换的日变化

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摘要

Biological soil crusts (BSCs) formed by different combinations of photosynthetic algae, cyanobacte-ria, lichens and mosses are well-developed in the Gurbantunggut Desert of northwestern China. To investigate the different responses of BSCs to environmental factors, the diurnal variations of chlorophyll fluorescence and CO_2 exchange of BSCs in different successional stages were measured following artificial rehydration in the field. Results showed that the maximum potential quantum efficiency of PSII (F_v/F_m), the actual PSII efficiency (Φ_(PSII)) and the relative rate of electron transport as well as net photosynthesis of the different successional BSCs varied similarly and changed markedly with diurnal fluctuations in light and temperature. Further analyses indicated that CO_2 exchange and photosynthetic pigment content of chlorophyll (Chi) a, Chi b and carotenoids increased with the developmental level of BSCs, from cyanobacterial crust to lichen crust to moss crust. The differences in responses of BSCs to environmental factors and photosynthetic pigment content may be partially attributed to differences in species composition and morphological characteristics of the various BSCs. Overall, moss crust is better adapted to a wide range of irradiance and higher temperatures than lichen and cyanobacterial crusts. Therefore, BSCs in a later successional stage are expected to play a more important role in desertification control than those of the earlier stages.
机译：在中国西北部的古尔班通古特沙漠中，由光合藻类，蓝细菌，苔藓和苔藓的不同组合形成的生物土壤结皮（BSC）发育良好。为了研究BSC对环境因素的不同反应，在田间人工补液后，测量了BSC在不同演替阶段的叶绿素荧光和CO_2交换的日变化。结果表明，不同连续BSCs的最大PSII潜在量子效率（F_v / F_m），实际PSII效率（Φ_（PSII））和相对电子输运速率以及净光合作用的变化相似，并且随着昼夜的变化而显着变化。光和温度的波动。进一步的分析表明，随着BSCs的发育，从蓝细菌外壳到地衣外壳到苔藓外壳，叶绿素（Chi）a，Chi b和类胡萝卜素的CO_2交换和光合色素含量都随着BSCs的发展而增加。 BSC对环境因素和光合色素含量的响应差异可能部分归因于各种BSC物种组成和形态特征的差异。总体而言，与地衣和蓝细菌外壳相比，苔藓外壳更适合广泛的辐照度和更高的温度。因此，预计在随后的继承阶段中，平衡计分卡在控制荒漠化方面将比早期阶段更重要。

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  • 来源
    《Ecological research》 |2014年第2期|289-298|共10页
  • 作者

    Jing Zhang; Yuan-Ming Zhang;

  • 作者单位

    Key Laboratory of Biogeography and Bioresource in Arid Land,Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 818 South Beijing Road, Urumqi 830011 Xinjiang,People's Republic of China;

    Key Laboratory of Biogeography and Bioresource in Arid Land,Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 818 South Beijing Road, Urumqi 830011 Xinjiang,People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biological soil crusts; Chlorophyll fluorescence; CO_2 exchange; Diurnal variation;

    机译：生物土壤结皮;叶绿素荧光;CO_2交换;昼夜变化;

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