• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Polar biology >Temperature modulates intra-plant growth of Salix polaris from a high Arctic site (Svalbard)
【24h】

Temperature modulates intra-plant growth of Salix polaris from a high Arctic site (Svalbard)

机译：温度调节北极高海拔地区（斯瓦尔巴特群岛）的北极柳的植物内生长

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Arctic ecosystems are important carbon sinks. Increasing temperatures in these regions might stimulate soil carbon release. Evidence suggests that deciduous shrubs might counteract these carbon losses because they positively respond to increasing temperature, but their role in ecosystem carbon budgets remains uncertain. Many studies dealing with large-scale tundra greening and carbon sequestration in relation to increasing temperature have usually based their estimations on the aboveground components, but very little is known about belowground growth. In this context, annual rings can provide a retrospective insight into intra-plant temperature responses and seasonal growth allocation. This study presents a 70-year-long and annually resolved intra-plant analysis of ring width and missing ring distribution from a comprehensive serial sectioning, including 142 cross-sections and the measurements of 471 radii from ten Salix polaris Wahlenb. dwarf shrubs growing in the high Arctic on Svalbard. Results indicate a high intra-plant and inter-annual growth variation, characterized by a high proportion of partially (13.6%) and completely (11.2%) missing rings. The annual growth and the frequency of completely missing rings were evenly distributed inside the plant and mainly controlled by summer temperatures. Radial growth in the belowground parts appeared to be proportionally higher during long and warm summers and lower in cold early growing seasons than in the aboveground parts. The results reveal a diverging allocation between aboveground and belowground growth depending on the climatic conditions. Favorable years promoted root allocation since root radial growth occurs after aboveground growth. The observed belowground responses suggest that shrub carbon allocation might be higher than estimated only from the above-ground compartments.
机译：北极生态系统是重要的碳汇。这些地区的温度升高可能会刺激土壤碳释放。有证据表明，落叶灌木可能抵消这些碳损失，因为它们对温度升高有积极的响应，但它们在生态系统碳预算中的作用仍不确定。许多涉及与温度升高有关的大型苔原绿化和碳固存的研究通常基于地上成分进行估算，但对地下生长的了解甚少。在这种情况下，年轮可以提供对植物内部温度响应和季节性生长分配的回顾性见解。这项研究提出了一项长达70年且每年解析的植物内部分析，该分析来自全面的连续切片，包括142个横截面和10个北极星Wahlenb的471半径的测量结果。在斯瓦尔巴特群岛高北极地区生长的矮灌木丛。结果表明，植物内部和年际之间的生长差异很大，其特征在于部分缺失环（13.6％）和完全缺失环（11.2％）的比例很高。年增长和完全缺失的环的频率均匀分布在植物内部，主要受夏季温度控制。在较长和温暖的夏季，地下部分的径向生长似乎比地下部分的径向生长高。结果表明，取决于气候条件，地上和地下生长之间的分配存在差异。有利的年份促进了根系分配，因为根部径向生长发生在地上生长之后。观察到的地下响应表明，灌木的碳分配可能比仅从地上的车厢估计的要高。

著录项

  • 来源
    《Polar biology》 |2013年第9期|1305-1318|共14页
  • 作者

    Agata Buchwal; Grzegorz Rachlewicz; Patrick Fonti; Paolo Cherubini; Holger Gaertner;

  • 作者单位

    Institute of Geoecology and Geoinformation, Adam Mickiewicz University, Dziegielowa 27, 61-680 Poznan, Poland ,WSL Swiss Federal Research Institute, Zuercherstrasse 111, 8903 Birmensdorf, Switzerland;

    Institute of Geoecology and Geoinformation, Adam Mickiewicz University, Dziegielowa 27, 61-680 Poznan, Poland;

    WSL Swiss Federal Research Institute, Zuercherstrasse 111, 8903 Birmensdorf, Switzerland;

    WSL Swiss Federal Research Institute, Zuercherstrasse 111, 8903 Birmensdorf, Switzerland;

    WSL Swiss Federal Research Institute, Zuercherstrasse 111, 8903 Birmensdorf, Switzerland;

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

    Annual rings; Serial sectioning; Intra-plant growth; Growth allocation; Missing ring; Arctic;

    机译：年轮;连续切片;植物内生长;增长分配;缺少铃声;北极;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号