Spatial patterns of above-ground structure, biomass and composition in a network of six Andean elevation transects
Spatial patterns of above-ground structure, biomass and composition in a network of six Andean elevation transects
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DOI：
10.1080/17550874.2013.820806
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发表时间：
2014-01-01
影响因子：
1.5
通讯作者：
Malhi, Yadvinder
中科院分区：
文献类型：
--
作者：
Girardin, Cecile A. J.;Farfan-Rios, William;Malhi, Yadvinder
背景：亚马逊到安第斯山脉的过渡带在环境梯度上提供了大片相对原始的森林荒野。这种海拔梯度是建立森林生态系统与环境参数之间长期相互作用的绝佳自然实验室，对于了解生态系统对环境变化的响应非常有价值。目的：本研究提供了安第斯山脉六个海拔样带的森林结构海拔趋势（生物量、断面积、高度、茎密度）、物种丰富度和组成的数据。方法：我们分析了森林的空间格局 76 个永久地块的结构、地上生物量和成分，范围从低地亚马逊雨林到厄瓜多尔、秘鲁和玻利维亚的高海拔云雾森林。结果：森林地上木本生物量储量范围从 247 Mg ha(-1)（秘鲁，210 m）到 86 Mg ha(-1)（秘鲁，3450 m），呈显着下降趋势 树高和生物量的变化以及茎密度随海拔升高而增加的趋势。我们观察到中海拔三个分类水平的森林丰富度增加，随后云浸区内的丰富度下降。结论：随着海拔的升高，样线显示茎密度增加，树高和地上粗木生物量下降，物种丰富度呈驼峰状趋势。这些结果表明，随着时间的推移，环境变化可能导致这些生态系统的特性发生重大变化。
Background: The Amazon to Andes transition zone provides large expanses of relatively pristine forest wilderness across environmental gradients. Such elevational gradients are an excellent natural laboratory for establishing long-term interactions between forest ecosystems and environmental parameters, which is valuable for understanding ecosystem responses to environmental change.Aims: This study presents data on elevational trends of forest structure (biomass, basal area, height, stem density), species richness, and composition from six elevational transects in the Andes.Methods: We analysed the spatial patterns of forest structure, above-ground biomass and composition from 76 permanent plots, ranging from lowland Amazonian rain forest to high-elevation cloud forests in Ecuador, Peru, and Bolivia.Results: Forest above-ground woody biomass stocks ranged from 247 Mg ha(-1) (Peru, 210 m) to 86 Mg ha(-1) (Peru, 3450 m), with significantly decreasing trends of tree height and biomass and an increasing trend of stem density with increasing elevation. We observed an increase in forest richness at three taxonomic levels at mid-elevation, followed by a decrease in richness within the cloud immersion zone.Conclusions: The transects show an increase in stem density, a decline in tree height and above-ground coarse wood biomass and a hump-shaped trend in species richness with increasing elevation. These results suggest that environmental change could lead to significant shifts in the properties of these ecosystems over time.