Biocomplexity associated with biogeochemical cycles in arctic frost-boil ecosystems

与北极冻沸生态系统中生物地球化学循环相关的生物复杂性

• 批准号: 0120736
• 负责人: Donald Walker
• 金额: $ 272.51万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-10-01 至 2007-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0120736&HistoricalAwards=false
• 关键词: Biocomplexity; associated; biogeochemical; cycles; arctic

The central goal of this project is to understand the complex linkages between biogeochemical cycles, vegetation, disturbance, and climate across the full summer temperature gradient in the Arctic in order to better predict ecosystem responses to changing climate. The project focuses on frost-boils because: (1) The processes that are involved in the self-organization of these landforms drive biogeochemical cycling and vegetation succession of extensive arctic ecosystems. (2) These ecosystems contain perhaps the most diverse and ecologically important zonal ecosystems in the Arctic and are important to global carbon budgets. (3) The complex ecological relationships between patterned-ground formation, biogeochemical cycles, and vegetation and the significance of these relationships at multiple scales have not been studied. (4) The responses of the system to changes in temperature are likely to be nonlinear, but can be understood and modeled by examining the relative strengths of feedbacks between the components of the system at several sites along the natural arctic temperature gradient.

该项目的中心目标是了解北极整个夏季温度梯度下生物地球化学循环、植被、干扰和气候之间的复杂联系，以便更好地预测生态系统对气候变化的反应。该项目将重点放在霜疮上，因为：(1)这些地貌的自组织过程驱动了广泛的北极生态系统的生物地球化学循环和植被演替。(2)这些生态系统可能是北极地区最多样化和生态重要性最大的地带性生态系统，对全球碳收支具有重要意义。(3)地纹地层、生物地球化学循环与植被之间的复杂生态关系及其在多尺度上的意义尚未得到研究。(4)系统对温度变化的响应可能是非线性的，但可以通过考察沿北极自然温度梯度几个站点系统各组成部分之间反馈的相对强度来理解和模拟。