Nutrient Cycling in Response to Forest Growth at Elevated CO2 (FACE)

二氧化碳浓度升高时森林生长的养分循环（FACE）

• 批准号: 9815350
• 负责人: William Schlesinger
• 金额: $ 36.84万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9815350&HistoricalAwards=false
• 关键词: Nutrient; Cycling; Response; Forest; Growth

DEB-9815350 Schlesinger/Finzi The atmospheric concentration of CO2 (abbreviated [CO2]a) has increased from 280 ppm to 360 ppm during the past 200 years and will double during the next century. Increases in forest productivity (and hence C-storage in tree biomass) are anticipated with the increase in [CO2]a. The increase in forest productivity will likely be limited by the availability of soil nitrogen (N) and phosphorus (P). We will examine the relationships between forest productivity and nutrient cycling in response to CO2 fertilization by working in a closed-canopy forest growing under Free-Air CO2 Enrichment (FACE) in the Duke Forest. To test whether nutrients will limit the growth of forests under elevated [CO2]a we will measure: (1) N & P fluxes in soils (microbial dynamics, N & P availability); (2) N & P uptake by trees; and (3) the major controls over the flux of N & P from vegetation to soils.

DEB-9815350 Schlesinger/Finzi 在过去的200年里，大气中的CO2浓度（缩写为[CO2]a）已从280 ppm增加到360 ppm，并将在下一个世纪翻一番。 随着[CO2]a的增加，预计森林生产力（以及树木生物量中的碳储存）将增加。 森林生产力的提高可能会受到土壤氮（N）和磷（P）可利用性的限制。 我们将通过在杜克森林的自由空气CO2富集（FACE）下生长的封闭林冠森林中工作，研究森林生产力和养分循环对CO2施肥的反应之间的关系。 为了测试是否养分会限制森林的生长下升高[CO2]a，我们将测量：（1）土壤中的N-P通量（微生物动力学，N-P的可用性）;（2）N-P吸收树木;（3）N-P从植被到土壤的通量的主要控制。