Biogeochemical and Vegetational Responses to an ExperimentalSimulation of Ecosystem Warming

生态系统变暖实验模拟的生物地球化学和植被响应

• 批准号: 9207588
• 负责人: John Harte
• 金额: $ 50万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-15 至 1995-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9207588&HistoricalAwards=false
• 关键词: Biogeochemical; Vegetational; Responses; ExperimentalSimulation; Ecosystem

Climate changes projected for ext century will impact ecosystems, yet the knowledge to foresee the direction and magnitude of these impacts is lacking. This study will improve our ability to predict these impacts by field manipulations, using overhead radiators to increase the downward heat flux on large plots within a subalpine meadow at the Rocky Mountain Biological Laboratory, CO. The heat flux will be set to match approximately the surface warming predicted in worst-case climate scenarios for the year 2050. Effects of this warming on soil moisture and temperature, soil nutrient pools and transformations, greenhouse gas fluxes, and plant production, species distribution, and phenology will be measured. Microclimate and nutrient cycle models, each to be calibrated with data from the control plots and validated with data from the warmed plots, will extend our knowledge of feedback mechanisms linking vegetation, greenhouse gas fluxes, soil nutrients, and soil microclimate, and will provide a basis for generalizing our findings to other sites. The research will also identify climate-sensitive ecological parameters that could be targets for geographically widespread monitoring of ecological symptoms of global warming.

预计下世纪的气候变化将影响生态系统， 然而，知识，以预见的方向和规模，这些 缺乏影响。 这项研究将提高我们的能力， 预测这些影响的现场操作，使用开销 散热器，以增加向下的热通量在大地块内 落基山生物实验室的亚高山草甸， 热通量将被设置为大致匹配表面 在最坏情况下预测的今年气候变暖 2050. 气候变暖对土壤湿度和温度的影响， 土壤养分库和转化，温室气体通量， 植物产量，物种分布和物候将是 测定了 微气候和养分循环模型，每一个都是 用控制地块的数据进行校准， 数据从温暖的曲线，将扩大我们的知识反馈 将植被、温室气体通量、土壤 营养素和土壤微气候，并将提供基础， 将我们的发现推广到其他网站。 该研究还将 确定气候敏感的生态参数， 地理上广泛的生态监测目标 全球变暖的症状。