RUI: Fine root production and architecture in a loblolly pine forest exposed to FACE: interactive effects of atmospheric CO2-enrichment with soil N availability

RUI：暴露于 FACE 的火炬松林中的细根生产和结构：大气 CO2 富集与土壤氮有效性的相互作用

• 批准号: 1020691
• 负责人: Seth Pritchard
• 金额: $ 58.43万
• 依托单位: College of Charleston
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1020691&HistoricalAwards=false
• 关键词: RUI; Fine; root; production; architecture

Project Abstract: RUI: Fine root production and architecture in a loblolly pine forest: interactive effects of atmospheric carbon dioxide-enrichment with soil nitrogen availability.Seth Pritchard (PI) and Allan Strand (Co-PI), College of CharlestonEfforts to characterize carbon cycling between the atmosphere, forest canopies, and the soil are hindered by a poor understanding of how long tree roots live. The influence of elevated atmospheric carbon dioxide (CO2) concentrations and fertilization on the smallest roots of loblolly pine trees has been studied since 1998 in the Duke University Forest. The lifespans of the smallest tree roots are being documented by periodically inserting a miniature camera into clear tubes installed permanently in soil. Using sequential digital images to measure the lifespan of roots of different sizes will be combined with analysis of root architecture and chemical analysis to better understand how root biology will be affected by elevated atmospheric CO2 concentrations. Carbon dioxide emitted from burning fossil fuels and deforestation is accumulating in the atmosphere. Some unknown quantity of this extra CO2 will be removed from the atmosphere by plants during photosynthesis and then moved by the plants into the soil where some of it may remain for centuries. Understanding how elevated CO2 will influence the lifespan of the smallest and most ephemeral roots is particularly important because these roots absorb most of the nutrients and water acquired by trees and when they die they transfer a large amount of carbon into the soil. A better understanding of root biology is needed to predict the potential for carbon storage in the soil.

项目摘要：- 我知道细根生产和建筑在火炬松森林：大气二氧化碳富集与土壤氮的有效性的相互作用。赛斯普里查德（PI）和艾伦斯特兰德（共同PI），查尔斯顿学院的努力，以表征碳循环之间的大气，森林冠层，和土壤是阻碍了多久树根的了解不足。自1998年以来，杜克大学森林研究了大气二氧化碳（CO2）浓度升高和施肥对火炬松最小根的影响。 通过定期将微型摄像机插入永久安装在土壤中的透明管中，可以记录最小树根的寿命。 使用连续的数字图像来测量不同大小的根的寿命将与根结构分析和化学分析相结合，以更好地了解根生物学如何受到大气CO2浓度升高的影响。 燃烧化石燃料和砍伐森林排放的二氧化碳正在大气中积累。 一些未知数量的额外二氧化碳将在光合作用期间被植物从大气中移除，然后被植物转移到土壤中，其中一些可能会保留几个世纪。了解二氧化碳浓度升高如何影响最小和最短命的根的寿命特别重要，因为这些根吸收树木获得的大部分营养和水分，当它们死亡时，它们将大量的碳转移到土壤中。 需要更好地了解根系生物学，以预测土壤中碳储存的潜力。