Mayle Francis E, Langstroth Robert P, Fisher Rosie A, Meir Patrick
Institute of Geography, School of Geosciences, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UK.
Philos Trans R Soc Lond B Biol Sci. 2007 Feb 28;362(1478):291-307. doi: 10.1098/rstb.2006.1987.
The aim of this paper is to evaluate the respective roles of past changes in climate, geomorphology and human activities in shaping the present-day forest-savannah mosaic of the Bolivian Amazon, and consider how this palaeoecological perspective may help inform conservation strategies for the future. To this end, we review a suite of palaeoecological and archaeological data from two distinct forest-savannah environments in lowland Bolivia: Noel Kempff Mercado National Park (NKMNP) on the Precambrian Shield and the 'Llanos de Moxos' in the Beni basin. We show that they contain markedly contrasting legacies of past climatic, geomorphic and anthropogenic influences between the last glacial period and the Spanish Conquest. In NKMNP, increasing precipitation caused evergreen rainforest expansion, at the expense of semi-deciduous dry forest and savannahs, over the last three millennia. In contrast, pre-Hispanic indigenous cultures were instrumental in facilitating recent forest expansion in the Llanos de Moxos by building a vast network of earthworks. Insights from Mid-Holocene palaeodata, together with ecological observations and modelling studies, suggest that there will be progressive replacement of rainforest by dry forest and savannah in NKMNP over the twenty-first century in response to the increased drought predicted by general circulation models. Protection of the latitudinal landscape corridors may be needed to facilitate these future species reassortments. However, devising appropriate conservation strategies for the Llanos de Moxos will be more difficult due to its complex legacy of Palaeo-Indian impact. Without fully understanding the degree to which its current biota has been influenced by past native cultures, the type and intensity of human land use appropriate for this landscape in the future will be difficult to ascertain.
本文旨在评估过去气候、地貌和人类活动的变化在塑造当今玻利维亚亚马逊地区森林 - 稀树草原镶嵌景观中各自所起的作用,并探讨这种古生态视角如何有助于为未来的保护策略提供信息。为此,我们回顾了来自玻利维亚低地两个不同森林 - 稀树草原环境的一系列古生态和考古数据:位于前寒武纪地盾上的诺埃尔·肯普夫·梅尔卡多国家公园(NKMNP)和贝尼盆地的“莫克索斯平原”。我们发现,在末次冰期和西班牙征服之间,它们包含了过去气候、地貌和人为影响的显著对比遗产。在NKMNP,过去三千年来,降水增加导致常绿雨林扩张,以牺牲半落叶干旱森林和稀树草原为代价。相比之下,前西班牙时期的本土文化通过构建庞大的土方工程网络,对促进莫克索斯平原近期的森林扩张起到了重要作用。全新世中期古数据的见解,连同生态观测和模型研究表明,由于大气环流模型预测的干旱增加,二十一世纪NKMNP的雨林将逐渐被干旱森林和稀树草原取代。可能需要保护纬度景观走廊以促进未来这些物种的重新分布。然而,为莫克索斯平原制定适当的保护策略将更加困难,因为其有着复杂的古印第安人影响遗产。如果不完全了解其当前生物群受过去本土文化影响的程度,未来适合该景观的人类土地利用类型和强度将难以确定。