Dissertation Research: Consequences and Implications of Leaf-Level N Versus P Limitation

论文研究：叶级 N 与 P 限制的后果和含义

• 批准号: 9701899
• 负责人: Guillermo Goldstein
• 金额: $ 0.78万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-01 至 1998-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9701899&HistoricalAwards=false
• 关键词: Dissertation; Research; Consequences; Implications; Leaf

9701899 Goldstein This proposed research focuses on the consequences and implications of leaf level nutrient limitation to photosynthesis, forest growth, and ecosystem processes caused by nitrogen versus phosphorus, the two most widespread and important limiting nutrients. The researchers propose to determine the consequences and implications of leaf level N versus P limitation in a very well-defined and constrained age sequence of sites in the Hawaiian Islands. The sites are all natural forests dominated by a single tree species, with remarkably constant environmental conditions, along which experiments have demonstrated that N limits production in young sites, and P limits the oldest site. Long-term fertilizer experiments are ongoing in these sites, so we can evaluate both nutrient-limited plots and the consequences of removing limitation by N or P. Results from this study will both augment and be integrated with investigations of belowground processes, stand-level characteristics, and ecosystem-level nutrient cycling to better understand tropical forest dynamics. Such information will have substantial implications for both the responsiveness of forests to change, and the restoration and management of forest ecosystems.

9701899 Goldstein这项拟议的研究重点是叶片水平养分限制对光合作用，森林生长和生态系统过程的影响和影响，这是由氮与磷这两种最广泛和最重要的限制性养分引起的。研究人员 建议确定的后果和影响叶水平N与P限制在一个非常明确的和受约束的年龄序列的网站在夏威夷群岛。这些地点都是由单一树种占主导地位的天然森林，具有非常恒定的环境条件，沿着实验表明，N限制了年轻地点的生产，P限制了最古老的地点。长期的肥料试验正在进行中，在这些网站，所以我们可以评估营养有限的地块和去除限制的N或P的后果，从这项研究的结果将增加和地下过程的调查，立场水平的特点，和生态系统水平的养分循环，以更好地了解热带森林的动态。这些资料将对森林对变化的反应以及森林生态系统的恢复和管理产生重大影响。