Nile Delta vegetation response to Holocene climate variability
Nile Delta vegetation response to Holocene climate variability
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DOI：
10.1130/g33012.1
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发表时间：
2012-07-01
期刊：
影响因子：
5.8
通讯作者：
Stanley, Jean-Daniel
中科院分区：
文献类型：
--
作者：
Bernhardt, Christopher E.;Horton, Benjamin P.;Stanley, Jean-Daniel
一个7000年的孢粉学记录，从布鲁卢斯泻湖，尼罗河三角洲，埃及，进行了评估，以调查陆地植被的变化，响应尼罗河流量。该地区以前的研究表明，在全新世早期到中期的海平面上升，以及在过去几个世纪中人类土地使用的显着增加，改变了泻湖及其周围的植被。这项研究的花粉记录记录了三角洲植被的变化，这可能反映了尼罗河水流的变化。我们认为，莎草科花粉是一个敏感的标志，在尼罗河源头和由此产生的尼罗河流量的降水。莎草科花粉的减少，解释为尼罗河流量减少的标志，以及微观木炭相对丰度的增加，发生在约。6000-5500，约。5000，ca. 4200，所以。3000 cal. yr B. P.（多年前校准）。这些对应于极端的区域和全球干旱事件与热带辐合带更偏南的平均位置。这些变化也被其他代用研究记录下来，表明几次显著的区域性干旱事件影响了尼罗河三角洲地区，并影响了古埃及和中东文明。
A 7000 yr palynologic record from Burullus Lagoon, Nile Delta, Egypt, is assessed to investigate changes in terrestrial vegetation in response to Nile flow. Previous studies in this region have shown that sea-level rise in the early to mid-Holocene, and markedly increased human land use during the past several centuries, altered vegetation in and around the lagoon. The pollen record from this study documents changes in delta vegetation that likely reflect variations in Nile flow. We suggest that Cyperaceae pollen is a sensitive marker of precipitation over the Nile headwaters and the resultant Nile flow. Decreases in Cyperaceae pollen, interpreted as a marker for diminished Nile flow, as well as the increase in relative abundance of microscopic charcoal, occurred at ca. 6000-5500, ca. 5000, ca. 4200, and ca. 3000 cal. yr B.P. (calibrated years before present). These correspond to extreme regional and global aridity events associated with a more southerly mean position of the Intertropical Convergence Zone. These changes, also recorded by other proxy studies, indicate that several marked regional drought events affected the Nile Delta region and impacted ancient Egyptian and Middle Eastern civilizations.