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首页> 外文期刊>Ecological research >Environmental factors controlling seed germination and seedling recruitment of Stipa bungeana on the Loess Plateau of northwestern China
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Environmental factors controlling seed germination and seedling recruitment of Stipa bungeana on the Loess Plateau of northwestern China

机译：中国西北黄土高原针茅种子萌发和幼苗吸收的环境因素

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摘要

Germination studies are important for collecting information on field seedling recruitment, plant conservation and restoration. This study investigated the role of light, temperature, nitrogen, water stress and burial depth in controlling germination of Stipa bungeana seeds. S. bungeana seeds are photo-inhibited; light significantly decreased seed germination regardless of temperature and water conditions. Seeds germinated at 10-30℃, and the highest germination was 72 % and 88 % at 20℃ in light and dark, respectively. Thermal model analysis showed that presence of light significantly increased average thermal requirement [θ_T(50)] from 105℃d to 186℃d at sub-optimal temperature, implying that light delays seed germination. Hydrotime model analysis showed that presence of light caused a shift in the median base water potential [ψ_b,(50)] from -0.68 to -0.26 MPa, which partly explains why light decreased both percentage and speed of germination, even at optimal conditions. As burial depth increased, seedling emergence initially increased and then decreased; the highest seedling emergence recruitment was 43 %, for seeds buried at a depth of 1 cm. Field observations showed that seedling emergence occurred primarily from July to September, and scarcely occurred from April to June. These results suggest that the light inhibitory effect is an adaptive mechanism that prevents S. bungeana seeds from germinating on the soil surface. To attain highest seedling establishment, seeds of S. bungeana should be sown at a soil depth of 1 cm prior to the rainy season, using seeds stored for 1 year.
机译：发芽研究对于收集有关田间幼苗招募，植物保护和恢复的信息非常重要。这项研究调查了光，温度，氮，水分胁迫和埋葬深度在控制针叶木种子发芽中的作用。 B. bungeana种子具有光抑制作用；无论温度和水条件如何，光照都能显着降低种子发芽率。种子在10-30℃下发芽，在黑暗和黑暗下20℃下的最高发芽率分别为72％和88％。热模型分析表明，光的存在将亚平均温度下的平均热需求[θ_T（50）]从105℃增加到186℃，这意味着光延迟了种子发芽。水文时间模型分析表明，光的存在引起中位基础水势[ψ_b，（50）]从-0.68到-0.26 MPa的变化，这部分解释了即使在最佳条件下，光也会降低发芽率和发芽率的原因。随着埋葬深度的增加，幼苗出苗率先增加，然后下降。对于埋在1厘米深度的种子，最高的出苗率是43％。实地观察表明，出苗主要发生在7月至9月，很少发生于4月至6月。这些结果表明，光抑制作用是一种防止松枝链霉菌种子在土壤表面发芽的适应性机制。为了获得最高的苗木定植率，在雨季之前，应在土壤深度1 cm的土壤中播种布氏链球菌种子，并使用储存1年的种子。

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  • 来源
    《Ecological research》 |2013年第5期|801-809|共9页
  • 作者

    Xiao Wen Hu; Zhi Qin Zhou; Ting Shan Li; Yan Pei Wu; Yan Rons Wang;

  • 作者单位

    State Key Laboratory of Grassland Agro-ecosystems, Lanzhou, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China;

    State Key Laboratory of Grassland Agro-ecosystems, Lanzhou, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China;

    State Key Laboratory of Grassland Agro-ecosystems, Lanzhou, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China;

    State Key Laboratory of Grassland Agro-ecosystems, Lanzhou, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China;

    State Key Laboratory of Grassland Agro-ecosystems, Lanzhou, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Burial depth; Hydrotime; Light; Nitrogen; Temperature; Thermal time; Water potential;

    机译：埋葬深度水文时间;光;氮;温度;保温时间;水势;

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