Collaborative Research: Forest Dynamics in Heterogeneous Landscapes

合作研究：异质景观中的森林动力学

• 批准号: 9220620
• 负责人: Charles Canham
• 金额: $ 16.62万
• 依托单位: Cary Institute of Ecosystem Studies, Inc.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-04-15 至 1996-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9220620&HistoricalAwards=false
• 关键词: Collaborative; Research; Forest; Dynamics; Heterogeneous

Throughout much of the past three hundred years the settlement of New England has resulted in the destruction and fragmentation of native forest vegetation. Recently, there has been an increase in forest regeneration in this region. This study is designed to gather field data from a variety of sites that will be used to parameterize a model of forest development based on actual starting conditions measured in the field. Forest dynamics is a function of seed dispersal, seedling establishment, and differential growth rates of component species. In this study field experiments will be conducted in a range of forest habitats to determine the role of seed dispersal and herbivory in effecting forest regeneration. The results from these experiments will be used to adjust and improve the forest dynamics model called SORTIE. Models such as SORTIE provide baseline data under known conditions against which it will be possible to compare actual patterns of forest regeneration. The mechanisms associated with the model will dramatically increase our ability to predict changes in forest vegetation. The ability to predict changes will have important implications for global climate change and its effects on future biodiversity. %%% Previous approaches to modelling forest dynamics have relied exclusively on average response variables and average environmental conditions. The SORTIE model represents a vast improvement over earlier models because it is truly spatially explicit. Initial conditions will be derived from positions of individual trees and saplings measured in the field. In addition, the actual environmental conditions in different stands will be measured and incorporated into the model. The role of herbivores in forest regeneration is being measured and added to the model. Finally, this model represents an advance because it incorporates environmental heterogeneity.

在过去的三百年中， 新英格兰的定居导致了破坏， 原生森林植被的破碎化。最近，有 这一地区的森林再生率有所提高。这 本研究旨在从多个站点收集现场数据 这将被用来参数化一个森林发展模型， 基于现场测量的实际启动条件。森林 动态是种子传播，幼苗建立， 和组成物种的不同生长率。本研究 将在一系列森林栖息地进行实地实验 确定种子传播和草食动物在 影响森林再生。这些实验的结果 将用于调整和完善森林动态模型 叫做SORTIE。 SORTIE等模型提供了基线数据， 已知的条件，可以与之进行比较 森林再生的实际模式。相关机制 将极大地提高我们预测 森林植被的变化。预测变化的能力将 对全球气候变化及其 对未来生物多样性的影响。 %%% 以前模拟森林动态的方法依赖于 仅对平均响应变量和平均 环境条件SORTIE模型代表了 与早期模型相比有所改进，因为它在空间上 很明显初始条件将从以下位置导出： 在野外测量的个别树木和树苗。此外，本发明还提供了一种方法， 不同林分的实际环境条件 测量并纳入模型。食草动物的作用 正在测量森林再生并将其加入模型。 最后，这种模式代表了一种进步，因为它包含了 环境异质性