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首页> 外文期刊>Ecological research >Transpiration of Cyclobalanopsis glauca (syn. Quercus glauca) stand measured by sap-flow method in a karst rocky terrain during dry season
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Transpiration of Cyclobalanopsis glauca (syn. Quercus glauca) stand measured by sap-flow method in a karst rocky terrain during dry season

机译：枯水期喀斯特岩石地形中树液流法测量青冈栎（蒸生栎）的蒸腾作用

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摘要

Seasonal drought may have a high impact on the karst ecosystem. The transpiration from Cyclobalanopsis glauca (syn. Quercus glauca) stand on a rocky hilly slope in South China was measured during the dry period of 2006 by using the Granier's sap-flow method. During the experimental period, maximum sap flux density (J_s) ranged from 20 to 40 g H_2O m~(-2) s~(-1) according to diameter of breast height (DBH) of individual trees. On sunny days, daily transpiration varied between 3.4 and 1.8 mm day~(-1). Transpiration of C. glauca was closely correlated to the radiation, air temperature, and vapor pressure deficit (VPD). Soil moisture was a very important factor influencing transpiration. The very low soil water content might result in low stand transpiration even when VPD is high, but high soil water content might also result in low transpiration if it was low VPD. However, VPD rather than soil moisture, affected largely the stand transpiration under high soil water content. The amount of transpiration was much more than that of the total soil moisture loss during the continuous sunny days, indicating that the dry shallow soils were probably not the only source for root-uptake water. C. glauca grows deep roots through the rock fissures of epikarst, indicating that cpikarst might be anotherrnmain source for sustaining transpiration in response to dry demand in autumn. Therefore, a large amount of deep roots of karst species would be a very important hydraulic connecting from the epikarst to above ground by transpiration, which would promote the biogeochemical process in a karst system.
机译：季节性干旱可能对喀斯特生态系统有很大影响。在2006年的干旱期，用Granier的汁液流法测量了华南石质丘陵山坡上青冈栎的蒸腾作用。在实验期间，最大的树液通量密度（J_s）根据单个树的胸高（DBH）的直径在20至40 g H_2O m〜（-2）s〜（-1）之间。在晴天，每天的蒸腾量在3.4至1.8毫米日间变化（-1）。 C. glauca的蒸腾作用与辐射，气温和蒸气压亏缺（VPD）密切相关。土壤水分是影响蒸腾作用的重要因素。即使VPD高，极低的土壤含水量也可能导致林分蒸腾不足，但如果VPD较低，那么高土壤含水量也可能导致低蒸腾作用。但是，VPD而不是土壤水分在很大程度上影响了高土壤水分条件下林分的蒸腾作用。在连续晴天期间，蒸腾量远大于土壤水分流失的总量，这表明干燥的浅层土壤可能不是唯一的根系吸收水源。 C. glauca通过表层岩溶的岩石裂缝生长着深厚的根，这表明，表层岩溶可能是响应秋季干燥需求而保持蒸腾作用的另一个主要来源。因此，大量的岩溶物种的深根将是通过蒸腾作用从表层岩溶到地上的非常重要的水力联系，这将促进岩溶系统中的生物地球化学过程。

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  • 来源
    《Ecological research》 |2009年第4期|791-801|共11页
  • 作者

    Yuqing Huang; Ping Zhao; Zhongfeng Zhang; Xiankun Li; Chengxin He; Ruiquan Zhang;

  • 作者单位

    South China Botanical Garden, Chinese Academy of Sciences, Xingke Road 723, Tianhe District, 510650 Guangzhou, China Guangxi Institute of Botany, Chinese Academy of Sciences, 541006 Guilin, China Graduate University of Chinese Academy of Sciences, 100864 Beijing, China;

    South China Botanical Garden, Chinese Academy of Sciences, Xingke Road 723, Tianhe District, 510650 Guangzhou, China;

    Guangxi Institute of Botany, Chinese Academy of Sciences, 541006 Guilin, China;

    Guangxi Institute of Botany, Chinese Academy of Sciences, 541006 Guilin, China;

    Guangxi Institute of Botany, Chinese Academy of Sciences, 541006 Guilin, China;

    Guangxi Institute of Botany, Chinese Academy of Sciences, 541006 Guilin, China;

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  • 正文语种 eng
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  • 关键词

    sap flux density; transpiration; seasonal drought; epikarst;

    机译：汁液通量密度;蒸腾作用季节性干旱;岩溶;

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