• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Regional Environmental Change >Fir decline and mortality in the southern Siberian Mountains
【24h】

Fir decline and mortality in the southern Siberian Mountains

机译：西伯利亚南部山区的冷杉减少和死亡率

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

Increased dieback and mortality of ``dark needle conifer'' (DNC) stands (composed of fir (Abies sibirica), Siberian pine (Pinus sibirica) and spruce (Picea obovata)) were documented in Russia during recent decades. Here we analyzed spatial and temporal patterns of fir decline and mortality in the southern Siberian Mountains based on satellite, in situ and dendrochronological data. The studied stands are located within the boundary between DNC taiga to the north and forest-steppe to the south. Fir decline and mortality were observed to originate where topographic features contributed to maximal water-stress risk, i.e., steep (18 degrees - 25 degrees), convex, south-facing slopes with a shallow well-drained root zone. Fir regeneration survived droughts and increased stem radial growth, while upper canopy trees died. Tree ring width (TRW) growth negatively correlated with vapor pressure deficit (VPD), drought index and occurrence of late frosts, and positively with soil water content. Previous year growth conditions (i.e., drought index, VPD, soil water anomalies) have a high impact on current TRW (r = 0.60-0.74). Fir mortality was induced by increased water stress and severe droughts (as a primary factor) in synergy with bark-beetles and fungi attacks (as secondary factors). Dendrochronology data indicated that fir mortality is a periodic process. In a future climate with increased aridity and drought frequency, fir (and Siberian pine) may disappear from portions of its current range (primarily within the boundary with the foreststeppe) and is likely to be replaced by drought-tolerant species such as Pinus sylvestris and Larix sibirica.
机译：近几十年来，俄罗斯记录了``暗针针叶树''（DNC）林分（由冷杉（Abies sibirica），西伯利亚松树（Pinus sibirica）和云杉（Picea obovata）组成）的死亡和死亡率增加。在这里，我们根据卫星，原位和树志年代学数据分析了南西伯利亚山区冷杉下降和死亡的时空格局。研究的林分位于北部的DNC针叶林与南部的森林草原之间。观察到冷杉的衰退和死亡起源于地形特征导致最大的水胁迫风险的地方，即陡峭的（18度至25度），凸面，朝南的斜坡以及排水良好的根部区域。杉木在干旱中存活下来，并增加了茎的径向生长，而上部冠层树木死亡。树轮宽度（TRW）的增长与蒸汽压亏缺（VPD），干旱指数和晚霜的发生呈负相关，与土壤含水量呈正相关。去年的生长条件（即干旱指数，VPD，土壤水异常）对当前的TRW有很大影响（r = 0.60-0.74）。水分胁迫加剧和严重干旱（作为主要因素）与树皮甲虫和真菌侵袭（作为次要因素）协同作用，导致了杉木死亡。树木年代学数据表明冷杉死亡率是一个周期性过程。在干旱和干旱频率增加的未来气候中，冷杉（和西伯利亚松树）可能会从其当前范围的一部分（主要在森林草原边界内）消失，并可能被耐旱物种（如樟子松和西伯利亚松树）取代。西伯利亚落叶松。

著录项

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