The emerging threat of Ca decline: quantifying current and predicting future Ca levels and their effects on aquatic biota in a 1600 lake watershed

Ca 下降的新威胁：量化当前和预测未来的 Ca 水平及其对 1600 个湖泊流域水生生物群的影响

• 批准号: 356704-2007
• 负责人: Yan, Norman
• 金额: $ 7.28万
• 依托单位: York University
• 依托单位国家: 加拿大
• 项目类别: Strategic Projects Supplemental Competition
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=365257
• 关键词: emerging; threat; Ca; decline; quantifying

The ongoing decline of soil, stream, pond and lake water Ca concentrations poses an emerging threat to the forests and lakes of the eastern Canadian Shield, but we currently do not have the information needed to quantify the severity and spatial extent of this threat, nor do we know how this threat might be affected by ongoing forest disturbances of fire and logging. In this new collaboration of a geospatial statistician, an aquatic ecotoxicologist, and two watershed biogeochemists, we will: 1) assess the current threat of Ca decline to one important group of Ca-rich biota (the animal plankton) in a large 1600-lake Ontario watershed; and 2) quantify how future acid deposition rates linked to international agreements on allowable SO2 emissions, forest fire frequencies linked to a changing climate, and logging practises might alter the threat of Ca decline. Ca decline is an emerging environmental issue, but one that might affect large tracts of eastern Canadian forests and surface waters, and similar ecosystems in the eastern USA and western Europe. Our objective is to determine the severity of this threat in one sensitive watershed as a necessary first step in assessing how serious the issue of Ca decline might become for Canada.

土壤、溪流、池塘和湖泊水中钙浓度的持续下降对加拿大盾东部的森林和湖泊构成了新的威胁，但我们目前没有必要的信息来量化这一威胁的严重性和空间范围，也不知道这一威胁可能如何受到持续的森林火灾和伐木干扰的影响。在这项由一位地理空间统计学家、一位水生生态毒物学家和两位流域生物地球化学家开展的新合作中，我们将：1)评估当前钙下降对安大略省一个1600湖大型流域中一组重要的富钙生物群(浮游生物)的威胁；2)量化未来酸沉降率与SO2允许排放量的国际协议、与气候变化有关的森林火灾频率以及伐木做法可能如何改变钙下降的威胁。CA下降是一个新出现的环境问题，但可能会影响加拿大东部的大片森林和地表水，以及美国东部和西欧类似的生态系统。我们的目标是在一个敏感的分水岭确定这一威胁的严重程度，作为评估加拿大钙下降问题可能变得多严重的必要的第一步。