LTER: The Luquillo Experimental Forest II

LTER：卢基洛实验森林 II

• 批准号: 9705814
• 负责人: Nicholas Brokaw
• 金额: $ 289.48万
• 依托单位: University of Puerto Rico-Rio Piedras
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-12-15 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9705814&HistoricalAwards=false
• 关键词: LTER; Luquillo; Experimental; Forest; II

9705814 Waide The Luquillo Experimental Forest (LEF) Long-Term Ecology Research Program began in 1988 with the goal of integrating studies of disturbance regime and forest structure and dynamics with a landscape perspective. Two central research questions addressed 1) the relative importance of different disturbance types within the four tropical rain forest life zones of the LEF and 2) the importance of the biota in restoring ecosystem productivity after disturbance. The long-term monitoring program initiated as part of the Luquillo LTER was critical to the evaluation of immediate and subsequent effects of Hurricane Hugo, which struck Puerto Rico in 1989. The occurrence of a hurricane soon after the initiation of the LTER program provides an opportunity to study the long-term dynamics of a tropical forest as it recovers from a major disturbance. Integration of the spatial and temporal patterns of the different disturbances affecting the LEF (tree falls, landslides, hurricanes, and human land use) indicated that even the effects of large disturbances are not homogeneous over the forest landscape. A strong gradient in damage from Hurricane Hugo occurs from northeast to southwest in the LEF, corresponding to the direction of the strongest winds. However, even in severely disturbed areas, many forest attributes were approaching their pre-hurricane values within four years of the storm. Forest responses depended both on the successional status of the site at the time of disturbance and the intensity of disturbance. In many areas, the legacy of past human activites was apparent in forest composition and structure even after Hurricane Hugo. The long-term experiments and measurements initiated in 1988 will remain the central focus of the Luquillo LTER as it moves into its second phase. Analysis of the dynamics of recovery after the hurricane and its associated landslides and synthesis of the interaction of multiple disturbances continue to be the primary goals of collaborating invest igators. New initiatives will concentrate on defining the distinctive characteristics of anthropogenic disturbance and on evaluating the importance of pivotal species in shaping the path of succession. As before, a major emphasis of the Luquillo LTER will be to provide information and ideas for cross-site and network-wide syntheses..

9705814外德卢基洛实验林长期生态研究方案始于1988年，目的是将干扰状况、森林结构和动态的研究与景观相结合。两个中心研究问题涉及：1)LEF四个热带雨林生命带内不同干扰类型的相对重要性；2)生物群在干扰后恢复生态系统生产力方面的重要性。作为Luquillo LTER的一部分启动的长期监测方案对于评估1989年袭击波多黎各的雨果飓风的直接和后续影响至关重要。LTER方案启动后不久就发生了飓风，这为研究热带森林从大干扰中恢复的长期动态提供了机会。对影响森林景观的不同干扰(树木倒塌、山体滑坡、飓风和人类土地利用)的空间和时间模式的综合表明，即使是大干扰的影响在森林景观上也不是均匀的。飓风雨果造成的损害在LEF从东北到西南出现了一个强烈的梯度，与最强风的方向相对应。然而，即使在受到严重干扰的地区，许多森林属性在风暴发生后的四年内也接近飓风前的价值。森林的反应既取决于受干扰时场地的演替状态，也取决于受干扰的强度。在许多地区，即使在飓风雨果之后，过去人类活动的遗产在森林的组成和结构中也是显而易见的。在进入第二阶段时，1988年开始的长期实验和测量仍将是卢基洛长期热核实验堆的中心重点。分析飓风及其相关山体滑坡后的恢复动态，以及综合多种干扰因素的相互作用，仍然是合作投资人的主要目标。新的倡议将集中于确定人为干扰的独特特征，并评估关键物种在确定演替道路上的重要性。与以前一样，Luquillo LTER的一个主要重点将是为跨站点和网络范围的合成提供信息和想法。