Fire and vegetation dynamics of endangered Araucaria araucana communities in the forest-steppe ecotone of northern Patagonia
Fire and vegetation dynamics of endangered Araucaria araucana communities in the forest-steppe ecotone of northern Patagonia
复制标题
巴塔哥尼亚北部森林草原交错带濒临灭绝的南洋杉群落的火灾和植被动态
DOI：
10.1016/j.palaeo.2021.110276
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Fontana
中科院分区：
文献类型：
--
作者：
Moreno-Gonzalez;Giesecke;Fontana
最近在巴塔哥尼亚北方的火灾制度的变化可能减少了人口ofAraucaria araucana，这是列为濒危物种。尽管南洋杉不依赖火来生存，但自然火是生态系统的一部分，南洋杉能承受适度的火灾。为了了解最近和长期的植被模式和过程，有助于保护任务，我们重建了植被和火灾历史的森林草原交错区在过去的9 kyr的基础上，从湖Relem在北方巴塔哥尼亚的一个很好的沉积物核心。在4.5ka以前，花粉含量表明草原植被占主导地位的景观。4.5 ka后的花粉组成表明，草原逐渐被灌木和林地所取代。在过去的2.5 kyr中，Nothofagus林地覆盖率最高。连续记录的宏观木炭颗粒表明20个低级别的火灾事件，更频繁的火灾之间的6和2.5万年。植被组成的变化部分与火灾频率的变化有关，而火灾事件的大小对植被没有明显的影响。从濒危南洋杉科植物的花粉中可以看出，该种在8 ~ 6 ka之间在雷莱姆湖周围广泛分布，在~6 ka时迅速减少，到现在又略有增加。结果没有显示由于欧美殖民化的火灾制度的变化。这一南洋杉种群的长期趋势并没有显示出在其他地方观察到的下降趋势。
Recent changes of the fire regime in northern Patagonia may have reduced populations ofAraucaria araucana, which is listed as an endangered species. AlthoughAraucariadoes not depend on fire to persist, natural fires are part of the ecosystem andAraucariawithstands moderate fires. To understand recent and long-term vegetation patterns and processes that help in conservation tasks, we reconstructed the vegetation and fire history of the forest-steppe ecotone over the last 9 kyr based on a well-dated sediment core obtained from Lake Relem in northern Patagonia. Before 4.5 ka, pollen content indicates that steppe vegetation dominated the landscape. Pollen composition after 4.5 ka suggests that steppe was gradually replaced by scrublands and woodlands. The highest amount ofNothofaguswoodland cover was reconstructed for the last 2.5 kyr. A continuous record of macro-charcoal particles indicates 20 fire events of low magnitude, with more frequent fires between 6 and 2.5 ka. Changes in vegetation composition were partly related to fire frequency changes, while the magnitude of fire events had no detectable influence on the vegetation. Pollen from the endangeredAraucariadocuments that the species was widespread around Lake Relem between 8 and 6 ka, decreasing abruptly ~6 ka, and slightly increasing up to the present. Results do not show a change in the fire regime due to the Euro-American colonization. The long-term trend of thisAraucariapopulation does not show the decline observed elsewhere.
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DOI：
10.1177/0959683612444144
发表时间：
2012-11
期刊：
The Holocene
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--
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DOI：
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DOI：
--
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2009
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