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首页> 外文期刊>Journal of quaternary science: JQS >Fire and drought as drivers of early Holocene tree line changes in the Peruvian Andes
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Fire and drought as drivers of early Holocene tree line changes in the Peruvian Andes

机译：干旱和干旱是秘鲁安第斯山脉早期全新世林木线变化的驱动力

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摘要

Three pollen and charcoal records from three lakes lying at 3400m elevation in southern Peru provided a record of landscape change spanning the last ca.18 000 cal. a BP. The tree line lay close to the site between ca. 16 000 and 12 000 cal. a BP, with Polylepis woodlands growing near the lakes. Progressively drying conditions led to increased fire after 12 000 cal. a BP, coinciding with a decline in Polylepis cover and Andean forest relicts as puna grasslands expanded. A strong decrease in the rate of sediment deposition between ca. 12 000 and ca. 4400 cal. a BP was interpreted to indicate the presence of sedimentary hiatuses. With the return of wet conditions after 4400 cal. a BP, forests did not reassemble around the lakes. Instead, fire-maintained grasslands dominated the landscape. Humans probably induced the intensified fire activity during the late Holocene and thereby deflected local successions. The modern fragmented landscape, with Polylepsis woodlands existing in fire-resistant pockets above the general limit of the Andean tree line, resulted from the intensification of human land use practices during the last 4400 cal. a BP.
机译：来自秘鲁南部海拔3400m的三个湖泊的三份花粉和木炭记录提供了最后约18 000 cal的景观变化记录。 BP。林木线位于ca. 16000和12000卡路里BP，湖附近有Polylepis林地。逐渐干燥的条件导致在12 000 cal后着火增加。 BP，同时随着puna草原的扩张，Polylepis覆盖率和Andean森林遗迹的减少。大约之间的沉积物沉积速率大大降低。约12 000 4400卡路里BP被解释为表明存在沉积裂隙。随着4400 cal的潮湿条件的恢复。作为BP，森林并未在湖泊周围重新聚集。取而代之的是，防火的草原主导了整个景观。在新世晚期，人类可能会引发激烈的火势活动，从而偏转局部演替。现代的碎片景观，是在过去的4400 cal期间人类土地使用实践的加剧导致了多虫属林地存在于安第斯树线一般极限以上的耐火口袋中。 BP。

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