Guatemalan forest synthesis after Pleistocene aridity.
Guatemalan forest synthesis after Pleistocene aridity.
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更新世干旱后危地马拉森林的综合。
DOI：
10.1073/pnas.81.15.4856
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发表时间：
1984
影响因子：
11.1
通讯作者：
B. Leyden
中科院分区：
文献类型：
--
作者：
B. Leyden
危地马拉佩滕省两个湖泊的沉积物提供了中美洲晚更新世干旱和随后的中温带森林合成的孢粉学证据。晚冰期的植被包括沼泽、稀树草原和杜松灌丛。早全新世温带森林之前的中温带热带森林Brosimum（ramon）。因此，危地马拉的“原始”雨林不超过10，000至11，000年，而由于玛雅人的干扰，贝登的“原始”雨林要年轻得多。在新热带地区，贝登有最mesic植被尚未显示取代旱生植被在更新世。干旱的晚冰期-湿润的全新世早期的过渡似乎已泛热带低地。Peten并不是一个更新世的避难所中生植物类群，因为已经建议。因此，中美洲北方和墨西哥南部现存雨林的起源仍然无法解释。
Sediments from two lakes in the Peten Department, Guatemala, provide palynological evidence from Central America of late Pleistocene aridity and subsequent synthesis of mesic forests. Late Glacial vegetation consisted of marsh, savanna, and juniper scrub. An early Holocene temperate forest preceded a mesic tropical forest with Brosimum (ramon). Thus "primeval" rain forests of Guatemala are no older than 10,000 to 11,000 years and are considerably younger in the Peten due to Mayan disturbances. Among dated Neotropical sites, the Peten has the most mesic vegetation yet shown to have supplanted xeric vegetation present during the Pleistocene. The arid late Glacial-humid early Holocene transition appears to have been pantropical in the lowlands. The Peten was not a Pleistocene refugium for mesophytic taxa, as has been suggested. Thus genesis of extant rain forests in northern Central America and southern Mexico remains unexplained.