Understanding and mitigating the effects of vegetation change on the storage and transport of fine sediment and associated nutrients in forested watersheds

了解和减轻植被变化对森林流域细粒沉积物和相关养分储存和运输的影响

• 批准号: 170413-2008
• 负责人: Stone, Micheal
• 金额: $ 1.09万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=422773
• 关键词: Understanding; mitigating; effects; vegetation; change

It is well known that wildfires have a profound effect on vegetation in forested areas, however, they can also significantly impact water quality. That impact can also extend downstream and potentially impact drinking water source quality and ecosystem health. This is because vegetation is one of the primary factors that governs key hydrological processes that impact both the rates and magnitude of fine sediment (silts and clay) supply and delivery to streams. In sub-alpine regions, wildfire-associated increases in fine sediment delivered to and stored in streams has significantly impacted water quality and sensitive aquatic habitat in downstream reaches. This impact is often evident in elevated heavy metal, biofilm, and nutrient levels. An improved understanding of the physical and chemical processes that govern the fate and transport of nutrients and contaminants bound to fine sediment is critical for the development of effective strategies to protect drinking water supplies and minimize the negative impacts of land use and vegetation change on water quality and overall river ecosystem health.

众所周知，野火对森林地区的植被有着深远的影响，然而，它们也会严重影响水质。 这种影响还可能延伸到下游，并可能影响饮用水源的质量和生态系统的健康。这是因为植被是控制关键水文过程的主要因素之一，这些水文过程影响细沉积物（淤泥和粘土）供应和输送到河流的速率和幅度。在亚高山地区，与野火相关的细沉积物输送到溪流并储存在溪流中，对下游的水质和敏感的水生生境产生了重大影响。这种影响通常在重金属，生物膜和营养水平升高中很明显。更好地了解控制附着在细沉积物上的营养物和污染物的归宿和迁移的物理和化学过程，对于制定有效战略保护饮用水供应和尽量减少土地使用和植被变化对水质和整个河流生态系统健康的负面影响至关重要。