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首页> 外文期刊>Ecological research >Effects of soil water conditions on the morphology, phenology,and photosynthesis of Betula ermanii in the boreal forest
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Effects of soil water conditions on the morphology, phenology,and photosynthesis of Betula ermanii in the boreal forest

机译：土壤水分条件对北方森林中桦桦形态，物候和光合作用的影响

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摘要

Four 2-year watering treatments were applied to Betula ermanii seedlings to investigate their responses to soil water conditions: ID [irrigated well (I) in the previous year and water deficit (D) in the current year], DD, DI, and II. RGR of the seedlings in current-year water deficit without experiencing previous-year water deficit (ID) was smaller than that of seedlings irrigated well in both years (II). Surprisingly, RGR did not differ between 2-year-water-deficited (DD) and -well-irrigated (II) treatments. There was no difference in the area-based photosynthetic rate of the late leaves, which are formed in the current-year environment, between the four water treatments, but their leaf longevity was shortened by water deficit. Area-based photosynthetic rate of the early leaves, whose buds are formed in the previous year environment, was smaller in ID than in II, but it did not differ between DD and II. The de-epoxidation state of the xanthophyll cycle was greater in ID than in DD. Leaf mass per area (leaf dry weight/leaf area) did not differ among the four water treatments. Specific root length (root total length/root dry weight) did not differ between ID and II. It was greater in DD than in II, probably resulting in increased water uptake efficiency. Photoprotective systems such as xanthophyll contents and antioxidant enzyme activities did not differ among the four treatments. Morphological responses of B. ermanii roots seem to be important as whole-plant-level responses to water deficit for maintaining RGR, in addition to leaf-level photosynthetic and phenological responses of two types of leaves. Our results partly explain how B. ermanii seedlings survive and maintain growth even under varying soil water conditions in the boreal forest.
机译：对德国桦（Betula ermanii）幼苗进行了四种为期2年的浇水处理，以研究其对土壤水分状况的响应：ID [上一年的灌溉井（I）和当年的缺水（D）]，DD，DI和II 。在没有遇到前一年水分亏缺（ID）的情况下，当年水分亏缺的幼苗的RGR都比两年灌溉良好的幼苗的RGR（II）小。令人惊讶的是，在2年缺水（DD）和井水灌溉（II）处理之间，RGR没有差异。在四种水处理之间，在当年环境中形成的晚叶的基于区域的光合速率没有差异，但是由于缺水而缩短了它们的叶片寿命。在上一年的环境中形成芽的早期叶片的区域光合作用速率在ID上小于II，但在DD和II之间没有差异。叶黄素循环的去环氧化状态在ID中比在DD中更大。在四种水处理中，单位面积的叶质量（叶干重/叶面积）没有差异。 ID和II之间的比根长（根总长/根干重）没有差异。 DD比II高，可能导致提高了吸水率。在四种处理之间，诸如叶黄素含量和抗氧化酶活性等光保护系统没有差异。除两类叶片的叶面光合和物候响应外，B。ermanii根的形态学响应似乎很重要，因为整株水平对水分亏缺的反应可保持RGR。我们的结果部分解释了即使在北方森林中不同土壤水分条件下，德国曼氏芽孢杆菌幼苗如何生存并维持生长。

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  • 来源
    《Ecological research》 |2010年第4期|P.823-835|共13页
  • 作者

    Azusa Tabata; Kiyomi Ono; Akihiro Sumida; Toshihiko Hara;

  • 作者单位

    Institute of Low Temperature Science, Hokkaido University,Kita-19, Nishi-8, Kita-ku, Sapporo 060-0819, Japan;

    rnInstitute of Low Temperature Science, Hokkaido University,Kita-19, Nishi-8, Kita-ku, Sapporo 060-0819, Japan;

    rnInstitute of Low Temperature Science, Hokkaido University,Kita-19, Nishi-8, Kita-ku, Sapporo 060-0819, Japan;

    rnInstitute of Low Temperature Science, Hokkaido University,Kita-19, Nishi-8, Kita-ku, Sapporo 060-0819, Japan;

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  • 关键词

    betula ermanii; morphological response; photoinhibition; photosynthesis; water deficit;

    机译：桦木形态反应光抑制光合作用;缺水;

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