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首页> 外文期刊>Ecological research >Habitat-specific responses of seed germination and seedling establishment to soil water condition in two Rheum species in the high Sino-Himalayas
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Habitat-specific responses of seed germination and seedling establishment to soil water condition in two Rheum species in the high Sino-Himalayas

机译：高喜马拉雅山两个大黄种种子萌发和幼苗生长对土壤水分状况的生境特异性响应

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摘要

Knowledge of how germination and seedling establishment respond to soil water condition is crucial for plant conservation under global warming and land-use changes. We tested the flooding and drought tolerance of two plant species with different occurrences along a soil water gradient by assessing seed germination, seedling survival, seedling growth, and root characteristics. In the high Sino-Himalayas, Rheum alexandrae typically occurs in wetlands, R. mobile in scree or open slope with well-drained soils. Seeds and seedlings of the two species were subjected to different soil water conditions in controlled greenhouse experiments. Seed germination in both species was inhibited by high soil water content; however, seeds of R. alexandrae were more tolerant to flooding, especially to submergence. Seedling survival, biomass accumulation, root diameter, and root porosity of R. alexandrae increased significantly with increased soil water content, but submergence was lethal for seedlings. Seedling survival, biomass accumulation, and root length of R. nobile increased significantly in response to reduced soil water content. These results indicate that in the two species, seed germination and seedling establishment in response to different soil water condition are habitat-specific. Because both species are susceptible to moderate changes in soil water condition, their species-specific requirements with respect to this factor should be a consideration when planning their conservation.
机译：了解发芽和幼苗生长如何响应土壤水分状况对于在全球变暖和土地利用变化的情况下保护植物至关重要。我们通过评估种子发芽，幼苗存活，幼苗生长和根系特征，沿着土壤水梯度测试了两种不同植物的耐旱性和耐旱性。在高喜马拉雅山地区，亚历山大大黄通常发生在湿地中，在沙砾中或在排水良好的土壤中开阔的坡地中传播大黄。在受控温室试验中，将两种物种的种子和幼苗置于不同的土壤水分条件下。高含水量抑制了两个物种的种子发芽。然而，亚历山大三世的种子更能抵抗洪水，特别是淹没。随着土壤含水量的增加，亚历山大草的幼苗存活，生物量积累，根系直径和根系孔隙率显着增加，但淹没对幼苗具有致命性。响应土壤水分减少，高粱的幼苗存活，生物量积累和根长显着增加。这些结果表明，在这两个物种中，响应于不同土壤水分条件的种子发芽和幼苗定植是特定于栖息地的。由于这两种物种都容易受到土壤水分状况的适度变化的影响，因此在规划其保护时应考虑其对物种的特定要求。

著录项

  • 来源
    《Ecological research》 |2013年第4期|643-651|共9页
  • 作者

    Bo Song; Juerg Stoecklin; Yong-Qian Gao; Zhi-Qiang Zhang; Yang Yang; Zhi-Ming Li; Hang Sun;

  • 作者单位

    Key Laboratory of Biodiversity and Biogeography,Kunming Institute of Botany, Chinese Academy of Sciences,132 Lanhei Road, Kunming 650201, Yunnan, China,University of Chinese Academy of Sciences,Beijing 100039, China;

    Institute of Botany, University of Basel,Schonbeinstr 6, 4056 Basel, Switzerland;

    Yunnan Forestry Technological College,Kunming 650224, Yunnan, China;

    Key Laboratory of Biodiversity and Biogeography,Kunming Institute of Botany, Chinese Academy of Sciences,132 Lanhei Road, Kunming 650201, Yunnan, China;

    Key Laboratory of Biodiversity and Biogeography,Kunming Institute of Botany, Chinese Academy of Sciences,132 Lanhei Road, Kunming 650201, Yunnan, China;

    School of Life Science, Yunnan Normal University,Kunming 650092, Yunnan, China;

    Key Laboratory of Biodiversity and Biogeography,Kunming Institute of Botany, Chinese Academy of Sciences,132 Lanhei Road, Kunming 650201, Yunnan, China;

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

    Drought; Flooding; Stress tolerance; Seed germination; Seedling establishment;

    机译：干旱;洪水;压力承受能力;种子发芽;苗木建立;

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