Snowlines and Treelines in the Tropical Andes

Snowlines and Treelines in the Tropical Andes
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热带安第斯山脉的雪线和林线

DOI:
10.1080/24694452.2016.1235479
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发表时间:
2017
影响因子:
3.9
通讯作者:
Lipton, Jennifer K.
Lipton, Jennifer K.
中科院分区:
法学2区
文献类型:
--
作者:
Young, Kenneth R.;Ponette-González, Alexandra G.;Polk, Molly H.;Lipton, Jennifer K.

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检查雪线和林线的动态可以深入了解影响热带安第斯山脉土地覆盖的环境变化过程。此外,这些生态交错带的土地覆盖代表了一个强大的镜头,通过它可以监测和理解跨生物物理梯度的生态过程,同时认识到其社会环境维度。为了说明这种方法,我们借鉴了热带安第斯山脉两个地点的最新研究,在区域尺度上,土地覆盖评估记录了冰川的退缩和森林覆盖量的变化,尽管陡峭的地形梯度在更精细的尺度上造成了空间变化。我们的研究结果表明,冰川退缩的异质模式为植物殖民开辟了新的生态空间,有可能形成新的草原、灌木丛和湿地。此外,林线变化与木本植物优势的变化有关,木本植物优势的变化速度和模式可能因坡向、过去的土地利用和当前的生计而变化。我们认为,土地利用和土地覆盖变化的区域和全球生物物理和社会经济驱动因素与海拔、坡向和坡度位置的特定景观组合的远程耦合可能解释了表征山区景观停滞和流动的大部分空间异质性。
Examination of the dynamism of snowlines and treelines could provide insights into environmental change processes affecting land cover in the tropical Andes Mountains. Further, land cover at these ecotones represents a powerful lens through which to monitor and understand ecological processes across biophysical gradients while acknowledging their socioenvironmental dimensions. To illustrate this approach, we draw on recent research from two sites in the high tropical Andes where, at the regional scale, land cover assessments document retreating glaciers and changing amounts of forest cover, even though steep topographic gradients impose spatial shifts at much finer scales. Our results show that heterogeneous patterns of glacier recession open up new ecological spaces for plant colonization, potentially forming new grasslands, shrublands, and wetlands. In addition, treeline shifts are tied to changes in woody plant dominance, which can vary in rate and pattern as a result of aspect, past land use, and current livelihoods. We suggest that the telecoupling of regional and global biophysical and socioeconomic drivers of land use and land cover change to specific landscape combinations of elevation, aspect, and slope position might explain much of the spatial heterogeneity that characterizes landscape stasis and flux in mountains.
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