Doctoral Dissertation Research: Disturbances and Tree Species Diversity Along the Elevational Gradient of a Subtropical Montane Forest

博士论文研究：亚热带山地森林沿海拔梯度的干扰和树种多样性

• 批准号: 9628459
• 负责人: Thomas Veblen
• 金额: $ 1万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-06-01 至 1998-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9628459&HistoricalAwards=false
• 关键词: Doctoral; Dissertation; Research; Disturbances; Tree

Grau, Hector R U. of Colorado, Boulder This project will assess how tree species diversity is affected by disturbances across a range of spatial scales, and how disturbance regimes are related to elevational gradients in subtropical montane forests in northwestern Argentina. It is hypothesized that in the higher montane forest, low diversity is maintained by frequent fire. In the lower montane forest, high diversity is promoted by the occurrence of small-scale treefall gaps. Abrupt changes in diversity between the higher and lower montane forest are believed to be caused by shifts in disturbance regimes that reflect the influences of both the underlying physical environmental gradients and vegetation responses to these gradients. Research methods will include dendroecological records of disturbance regimes at a stand and landscape scale, spatial and temporal patterns of tree recruitment in relation to bamboo cover, stand-scale measures of diversity, and the use of remote sensing to map the limit between lower and higher montane forests. The results will yield information on how climatic change and anthropogenic changes in disturbance regimes affect biodiversity.

格劳，赫克托R U。来自科罗拉多，博尔德 该项目将评估树种多样性是如何影响干扰在一系列的空间尺度，以及如何干扰制度与海拔梯度在阿根廷西北部的亚热带山地森林。 据推测，在较高的山地森林，低多样性是由频繁的火灾。 在较低的山地森林，高多样性的发生促进了小规模的树倒间隙。 较高和较低的山地森林之间的多样性的突然变化被认为是由扰动制度的变化，反映了底层的物理环境梯度和植被对这些梯度的反应的影响。 研究方法将包括在林分和景观尺度上对干扰状况的树木生态学记录、树木补充与竹子覆盖的空间和时间格局、林分尺度的多样性措施以及利用遥感绘制低海拔和高海拔山地森林之间的界限。 研究结果将提供关于气候变化和人为干扰机制变化如何影响生物多样性的信息。