Haidee Cadd, Michela Mariani, John Tibby, Jonathan Tyler, Cameron Barr, Melanie J. Leng, Patrick Moss, Richard Lewis, Tim Cohen, Sam Marx, Glenn B. McGregor, Jonathan C. Marshall, Lynda Petherick
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Here, a synthesis of palynological records from six Minjerribah wetlands using a muti-tiered Monte Carlo empirical orthogonal function (EOF) analysis allows island-wide patterns of vegetation change to be identified. Coherent changes in vegetation were recorded, with first-order changes (EOF1) indicating a long-term shift in vegetation composition from closed forests towards woodland and heath vegetation. A compilation of macroscopic and microscopic charcoal from the same sites shares coherent patterns of change with a rainfall record from the island, suggesting that regional fire occurrence between 7000 and 2000 cal a <span>bp</span> was driven primarily by long-term variations in rainfall and its influence on biomass. Comparison with fire activity, rainfall, sedimentary carbon, nitrogen and dust records from Minjerribah suggests that regional vegetation changes occur primarily in response to long-term changes in nutrients and increasing rainfall variability. 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引用次数: 0
摘要
Minjerribah(北斯特拉德布鲁克岛)的标志性沙丘系统位于澳大利亚昆士兰州东南部,拥有许多湖泊和沼泽,其中含有富含有机物的沉积物,记录了气候,火灾和周围植被的变化。单个地点的古环境重建可以提供对环境变化的见解,但从单个地点确定这些变化的区域范围是不可能的。多地点汇编有助于阐明环境变化的地理性质,并确定它们是由地方或区域力量驱动的。本文利用多层蒙特卡罗经验正交函数(EOF)分析,综合了6个Minjerribah湿地的孢粉记录,从而确定了全岛范围内的植被变化模式。植被连续变化,一阶变化(EOF1)表明植被组成从封闭森林向林地和荒地植被的长期转变。来自同一地点的宏观和微观木炭的编纂与该岛的降雨记录具有一致的变化模式,表明7000至2000 cal / bp之间的区域火灾发生主要是由降雨的长期变化及其对生物量的影响驱动的。与Minjerribah的火灾活动、降雨、沉积碳、氮和尘埃记录的比较表明,区域植被变化主要是对营养物质长期变化和降雨变动性增加的响应。该分析强调了亚热带全新世植被组成、气候、营养物质与火灾发生之间的千年联系。
Australian subtropical vegetation and wetland response to fire, climate and nutrient availability during the Holocene
The iconic sand dune systems of Minjerribah (North Stradbroke Island), in southeastern Queensland, Australia, host numerous lakes and swamps containing organic-rich sediment deposits that record changes in climate, fire and surrounding vegetation. Palaeoenvironmental reconstructions from individual locations can provide insights into changes in the environment, but determining the regional extent of these changes is seldom possible from a single site. Multi-site compilations help elucidate the geographical nature of environmental changes and determine if they are driven by local or regional forces. Here, a synthesis of palynological records from six Minjerribah wetlands using a muti-tiered Monte Carlo empirical orthogonal function (EOF) analysis allows island-wide patterns of vegetation change to be identified. Coherent changes in vegetation were recorded, with first-order changes (EOF1) indicating a long-term shift in vegetation composition from closed forests towards woodland and heath vegetation. A compilation of macroscopic and microscopic charcoal from the same sites shares coherent patterns of change with a rainfall record from the island, suggesting that regional fire occurrence between 7000 and 2000 cal a bp was driven primarily by long-term variations in rainfall and its influence on biomass. Comparison with fire activity, rainfall, sedimentary carbon, nitrogen and dust records from Minjerribah suggests that regional vegetation changes occur primarily in response to long-term changes in nutrients and increasing rainfall variability. This analysis highlights the multi-millennial connection between vegetation composition, climate, nutrients and fire occurrence across the Holocene in subtropical environments.
期刊介绍:
The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.