SGER: Effects of Wildfire on Aquatic and Terrestrial Ecology in an Oak Woodland - Chaparral Ecosystem

SGER：野火对橡树林地 - 丛林生态系统水生和陆地生态的影响

• 批准号: 0072804
• 负责人: Susan Harrison
• 金额: $ 5万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-01 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0072804&HistoricalAwards=false
• 关键词: SGER; Effects; Wildfire; Aquatic; Terrestrial

AbstractSusan P. HarrisonU of California - Davis0072804The 40,000-acre wildfire in Northern California that occurred 16 October 1999 presents a very valuable scientific opportunity to address new questions about aquatic ecosystem and terrestrial plant community responses to perturbation. Aquatic studies will examine (1) whether nutrient enrichment 'cascades up' alternating trophic levels (as sometimes found in simple experimental systems) or increases abundances at all trophic levels (as typically found in complex natural systems); (2) the speed of recovery of the simpler invertebrate faunas of intermittent streams in comparison to more complex faunas of permanent streams; and (3) whether nutrient enrichment leads to higher biological uptake of mercury in this system. Terrestrial studies will examine how spatial isolation from seed sources influences the recovery of the grassland plant community and whether the effects of fire on the plant community (including its dominance by alien species) depends on substrate and grazing history. The results of this project coupled with a multi-year pre-fire database will provide new insights into how large infrequent fires influence patterns of diversity at the watershed scale.

1999年10月16日发生在北方加州州的40,000英亩的野火为解决有关水生生态系统和陆地植物群落对扰动的反应的新问题提供了一个非常宝贵的科学机会。 水生研究将检查（1）营养富集是否会“级联”交替营养级（有时在简单的实验系统中发现）或增加所有营养级的丰度（2）间歇性河流中较简单的无脊椎动物区系与永久性河流中较复杂的动物区系相比的恢复速度;以及（3）营养物富集是否导致该系统中较高的汞生物吸收。陆地研究将审查与种子源的空间隔离如何影响草原植物群落的恢复，以及火灾对植物群落的影响（包括外来物种的优势）是否取决于基质和放牧历史。 该项目的结果加上多年火灾前数据库将提供新的见解如何大罕见的火灾影响格局的多样性在流域规模。