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首页> 外文期刊>Geografiska Annaler, Series A. Physical Geography >A 700-YEAR RECORD ON THE EFFECTS OF CLIMATE AND HUMAN IMPACT ON THE SOUTHERN CAPE COAST INFERRED FROM LAKE SEDIMENTS OF EILANDVLEI, WILDERNESS EMBAYMENT, SOUTH AFRICA
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A 700-YEAR RECORD ON THE EFFECTS OF CLIMATE AND HUMAN IMPACT ON THE SOUTHERN CAPE COAST INFERRED FROM LAKE SEDIMENTS OF EILANDVLEI, WILDERNESS EMBAYMENT, SOUTH AFRICA

机译：一份700年的气候和人类记录，记录了从南非伊兰德勒伊湖沉积物，南非荒地的沉积物中推断出的南太平洋海岸的气候和人为影响

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摘要

The southern Cape coast, South Africa, is sensitive to climate fluctuations as it is influenced by different atmospheric and oceanic circulation systems. Palaeoecological evidence of Holocene climate variations in this region is presently limited. Here, we present a lake sediment record spanning approximately the last 670 years from Eilandvlei, a brackish coastal lake situated mid-way between Cape Town and Port Elizabeth. The results from geochemical and sedimentological analyses point to an increase in minerogenic sediment input from the catchment starting around ad 1400. Changes in the seasonal distribution of rainfall during the Little Ice Age may have altered river discharge and increased erosion rates and fluvial sediment transport in pre-colonial times. A rising mean lake level, possibly associated with an altered water balance or relative sea-level rise, may offer an explanation for the deposition of finer sediments. After ad 1450, reduced burial flux of elements associated with autochthonous sediment formation may have resulted from ecological changes in Eilandvlei. Enhanced sedimentation rates, increasing carbon, nitrogen, phosphorous and biogenic silica concentrations, as well as high concentrations of proxies for allochthonous sediment input (e.g. aluminium, titanium, zirconium) point to increasing sediment and nutrient flux into Eilandvlei from the late nineteenth century onwards. The most likely factor involved in these recent changes is land-use change and other forms of human impact.
机译：由于受到不同的大气和海洋环流系统的影响，南非南开普省海岸对气候波动敏感。目前该地区全新世气候变化的古生态证据有限。在这里，我们呈现了一个大约从过去的670年以来的湖泊沉积物记录，它来自开普敦和伊丽莎白港之间的一个咸淡的沿海湖泊Eilandvlei。地球化学和沉积学分析的结果表明，大约从公元1400年左右开始，流域的成矿沉积物输入量增加。小冰河时期降雨的季节性分布变化可能改变了河流流量，并增加了河谷侵蚀率和河床沉积物的运移。 -殖民时代。平均湖泊水位上升，可能与水量平衡变化或相对海平面上升有关，可能为较细的沉积物的沉积提供了解释。公元1450年后，埃兰德弗莱（Eilandvlei）的生态变化可能导致与土生土沉积物相关的元素的埋藏通量降低。沉积速率的提高，碳，氮，磷和生物硅的浓度增加，以及异源沉积物输入的高浓度代理（例如铝，钛，锆）表明，从19世纪后期开始，沉积物和养分向Eilandvlei的流量增加。这些最新变化中最有可能涉及的因素是土地利用变化和其他形式的人类影响。

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