Early Lake Ontogeny Following Neoglacial Ice Recession at Glacier Bay, Alaska

阿拉斯加冰川湾新冰川消退后的早期湖泊发育

• 批准号: 8705371
• 负责人: Daniel Engstrom
• 金额: $ 30.28万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-01 至 1991-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8705371&HistoricalAwards=false
• 关键词: Early; Lake; Ontogeny; Following; Neoglacial

Drs. Daniel Engstrom and Herbert Wright of the University of Minnesota propose a study of lake ecology following the glacial recession of 10,000 years ago in Glacier Bay, Alaska. This investigation will explore the earliest stages of lake development in relation to primary succession in vegetation and soils along a 120-year deglaciation chronosequence. Emphasis will be placed on changes in water chemistry, primary production and phytoplankton composition, and the influence of catchment geology and hydrology in regulating material flow from watershed to lake. The problem of early lake ontogeny will be attacked with two complementary research strategies. (1) Limnological conditions will be compared among lakes of known age and in different stages of primary catchment succession, and (2) sediment cores from these same trends in pH, alkalinity, and algal composition at individual sites. Several hypotheses concerning early postglacial land/water interactions will be tested, including (a) the progressive leaching of catchment soils makes lakes more acidic over time, (b) hydrologic and geologic differences among sites act to control the rates and direction of limnological change, (c) increased nutrient flux associated with early soil formation result in an initial increase in lake productivity, and (4) peat growth and regional paludification impede internal soil drainage and cause the dystrophication of surface waters. This work has high interests for students of paleolimnology in particular and paleoecology and ecology in general. It gains in significance when placed in context of current interests and concerns about global climatic change and its influence on ecosystems and man-made systems. How lakes develop and stabilize is also of interest to those studying how contemporary lakes are disturbed by and recover from acidification. The investigators and their institution are world renowed for their work in this area.

牛津大学的丹尼尔恩斯特罗姆和赫伯特赖特博士 明尼苏达州提出了一项冰川后湖泊生态学的研究 一万年前阿拉斯加冰川湾的经济衰退 这项调查将探索湖泊的最早阶段 与植被原生演替有关的发展， 土壤沿着120年的冰川消退时间序列。 重点 将放在水化学的变化，初级生产， 和浮游植物组成，以及集水区的影响 水文地质学在流域物质流调节中的作用 去湖边 早期湖泊个体发育的问题将受到攻击 有两个互补的研究策略。 (1)湖沼 将比较已知年龄的湖泊和 初级集水区演替的不同阶段;（2） 从这些相同的pH值，碱度， 个别地点的藻类组成。 几个假说 关于冰后期早期陆地/水的相互作用， 测试，包括（a）集水区土壤的渐进沥滤 随着时间的推移，使湖泊变得更加酸性，（B）水文和地质 站点之间的差异用于控制 湖沼学变化，（c）增加营养通量与 早期的土壤形成导致了湖泊的初始增加 泥炭生长与区域沼泽化 阻碍内部土壤排水，导致营养不良， 地表沃茨。 这项工作对古湖沼学的学生有很高的兴趣 特别是古生态学和一般生态学。 它获得 在当前利益的背景下， 对全球气候变化及其对人类的影响的关切 生态系统和人造系统。 湖泊如何发展和稳定 对那些研究现代湖泊 受酸化干扰并从酸化中恢复。 调查人员和他们的机构是世界闻名的 他们在这个领域的工作。