• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Ecology and Evolution >Vegetation trends over eleven years on mountain summits in NW Argentina
【2h】

Vegetation trends over eleven years on mountain summits in NW Argentina

机译：阿根廷西北山区山顶上十一年来的植被趋势

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

As global climate change leads to warmer and dryer conditions in the central Andes, alpine plant communities are forced to upward displacements following their climatic niche. Species range shifts are predicted to have major impacts on alpine communities by reshuffling species composition and abundances. Using a standardized protocol, we surveyed alpine plant communities in permanent plots on four high Andean summits in NW Argentina, which range from 4,040 to 4,740 m a.s.l. After a baseline survey in 2006–2008, we resurvey the same plots in 2012, and again in 2017. We found a significant decrease in plant cover, species richness, and diversity across the elevation gradient in the three censuses and a strong decrease in soil temperature along the elevation gradient. We found a high plant community turnover (37%–49%) among censuses, differentiating according to summits and aspects; major changes of community turnover were observed in the lowest summit (49%) and on the northern (47%) and western (46%) aspects. Temporal patterns in community changes were represented by increases in plant cover in the highest summit, in species richness in the lower summit, and in diversity (Shannon index) in the four summits, over time, together with increase in small herbs and non‐tussock grasses. We suggest that the observed trend in plant community dynamics responds to short‐term temperature and precipitation variability, which is influenced by El Niño Southern Oscillation (ENSO), and due to time lags in plant community response, it may take much longer than one decade for the observed trends to become stables and statistically significant. Our study provides an important foundation for documenting more profound changes in these subtropical alpine plant communities as global climate change continues.
机译：随着全球气候变化导致安第斯山脉中部的气候变暖和干燥，高山植物群落因其生态位而被迫向上迁移。通过改组物种组成和丰度，物种范围的变化预计会对高山社区产生重大影响。使用标准化协议，我们在阿根廷西北部的四个安第斯山脉最高峰上的永久土地上调查了高山植物群落，面积从4,040到4,740 m.s.l.经过2006-2008年的基线调查后，我们在2012年和2017年再次调查了相同的样地。我们发现，在三个人口普查中，海拔高度梯度上的植物覆盖率，物种丰富度和多样性均显着下降，土壤显着下降沿海拔梯度的温度。我们在普查中发现了较高的植物群落周转率（37％–49％），根据峰会和方面有所不同。在最低峰顶（49％）和北部（47％）和西部（46％）地区观察到社区流动的主要变化。随着时间的推移，社区变化的时间模式表现为：最高峰的植物覆盖增加，较低峰的物种丰富度增加，以及四个峰的植物多样性（香农指数）随时间的推移，以及小草药和非草丛的增加草。我们建议观察到的植物群落动态趋势对短期温度和降水变化有响应，这受厄尔尼诺南方涛动（ENSO）的影响，并且由于植物群落响应的时间滞后，可能需要花费超过十年的时间使观察到的趋势变得稳定并具有统计意义。我们的研究为记录随着全球气候变化持续发生的这些亚热带高山植物群落的更深刻变化提供了重要的基础。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

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