Dissertation Research: Forest Regeneration in Agricultural Windbreaks: Effects of Connectivity and Remnant Trees

论文研究：农业防风林的森林再生：连通性和残存树木的影响

• 批准号: 9700906
• 负责人: Todd Dawson
• 金额: --
• 依托单位: Cornell University
• 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: 1997-07-15 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9700906&HistoricalAwards=false
• 关键词: Dissertation; Research; Forest; Regeneration; Agricultural

9700906 Dawson The goal of this research is to characterize the dynamics of windbreak colonization by tropical forest trees and to examine how the positioning of windbreaks within the landscape influences the colonization process. In particular, the effects of windbreak connectivity and remnant trees within the windbreaks will be evaluated. Preliminary research indicates that windbreak connectivity and remnant trees increase the abundance and richness of forest trees in windbreaks. It is hypothesized that these factors enhance forest regeneration by increasing seed dispersal into the windbreaks. To understand the dynamics of forest regeneration, a combination of vegetation surveys, seed trapping, soil seed bank studies, and seed predation trials will be conducted in windbreaks and pastures in Monteverde, Costa Rica. The seed rain entering different windbreak types (connected, non-connected, and with remnant trees) and pastures will be characterized for a one-year period using seed traps. The soil seed banks of windbreaks and pastures will be assessed using the seedling emergence technique. Seed predation in windbreaks and pastures will be evaluated through seed removal experiments. This research will enhance our understanding of the dynamics of forest regeneration in agroecosystems and also provide useful information for reforestation and conservation programs in the tropics.

9700906道森本研究的目标是表征热带森林树木的防风林殖民化的动态，并研究如何定位的景观内的防风林影响殖民化过程。特别是，将评估防风林连通性和防风林内残留树木的影响。初步研究表明，林网连通度和残存木增加了林网内林木的丰富度和多样性。据推测，这些因素通过增加种子传播到防风林中来增强森林再生。为了了解森林再生的动态，将在哥斯达黎加的蒙特韦尔德的防风林和牧场进行植被调查、种子诱捕、土壤种子库研究和种子捕食试验。种子雨进入不同的防风林类型（连接，非连接，并与残余树木）和牧场的特点是一年的时间内使用种子陷阱。将使用出苗技术评估防风林和牧场的土壤种子库。将通过种子清除实验评估防风林和牧场中的种子捕食。这项研究将加强我们对农业生态系统中森林更新动态的理解，并为热带地区的造林和保护计划提供有用的信息。