Collaborative Research: Spatial and temporal patterns of secondary tropical forest succession

合作研究：次生热带森林演替的时空格局

• 批准号: 2016653
• 负责人: Rakan Zahawi
• 金额: $ 24.71万
• 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: 2021
• 资助国家: 美国
• 起止时间: 2021-01-01 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2016653&HistoricalAwards=false
• 关键词: Collaborative; Research; Spatial; temporal; patterns

Around the world, there is growing interest in restoring forests, which improve water quality, store carbon, conserve biodiversity, and ensure human wellbeing. But there are few long-term studies to guide forest restoration, especially in the tropics. This project builds on an existing long-term, experiment that compares different ways of restoring tropical forest. The research will measure how well forests are recovering after nearly two decades of different treatments at many sites. The study will also answer questions about how important nearby forest patches are to the recovery of the restored sites. Results will provide critical guidance to land managers and policymakers on how and where to invest limited resources to improve forest restoration efforts. The project will develop online lessons about forest management and restoration for college-level students and continue an inquiry-based learning program for high school students.More than 15 years ago, 12 experimental sites were established over a 100 square-kilometer area in southern Costa Rica. Sites are surrounded by a range of low to high forest cover. Each site has three experimental treatments: (1) low intensity -- no tree planting and natural recovery, (2) medium intensity -- planting tree islands of three sizes, and (3) high intensity -- planting the entire plot with trees. New research activities will include conducting an intensive survey of all tree recruits in restoration and reference forest plots for the first time to thoroughly quantify rare, later-successional recruits. A detailed map of forest cover and individual focal tree species surrounding the sites will be created to assess the importance of proximity to seed sources. To better understand factors limiting forest recovery, investigators will measure seed dispersal and conduct seed-additional experiments. Overall, the project will use field data and remote sensing techniques to address a host of key debates in tropical community ecology about the dynamics of later-successional tree recruitment. These debates include the relative importance of seed dispersal, seedling establishment, and tree growth in determining secondary forest community composition; the degree to which manipulations of initial site conditions affect changes in species composition over time; and the importance of landscape-scale processes on long-term forest recovery.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在世界范围内，人们对恢复森林的兴趣越来越大，从而改善水质，储存碳，保护生物多样性并确保人类的福祉。但是，很少有长期研究可以指导森林修复，尤其是在热带地区。该项目基于现有的长期实验，该实验比较了恢复热带森林的不同方式。这项研究将衡量在许多地点进行了将近二十年的不同治疗方法后的森林恢复状况。该研究还将回答有关附近森林斑块对恢复现场的重要性的重要问题。结果将为土地经理和政策制定者提供关键的指导，涉及如何以及在哪里投资有限的资源来改善森林恢复工作。该项目将开发有关大学级学生森林管理和修复的在线课程，并继续为高中学生提供基于询问的学习计划。在15年前，在哥斯达黎加南部的100平方公里区域建立了12个实验地点。地点被各种低至高森林覆盖物所包围。每个地点都有三种实验治疗方法：（1）低强度 - 没有养殖和自然恢复，（2）中等强度 - 种植三种尺寸的树岛，以及（3）高强度 - 用树木种植整个地块。新的研究活动将首次对所有修复和参考森林地块中的所有树木新兵进行密集调查，以彻底量化稀有的，后来的新兵。将创建围绕这些地点的森林覆盖物和各个焦点树种的详细地图，以评估邻近种子来源的重要性。为了更好地理解限制森林恢复的因素，研究人员将测量种子的分散并进行种子 - 累及实验。总体而言，该项目将使用现场数据和遥感技术来解决有关热带社区生态学的许多关键辩论，这些辩论涉及后来成功的树木招聘的动态。这些辩论包括种子分散，幼苗建立和树木生长在确定次要森林群落组成方面的相对重要性；随着时间的推移，对初始现场条件的操纵影响物种组成的变化的程度；该奖项反映了NSF的法定任务，景观规模的过程对长期森林复苏的重要性，并被认为是值得通过基金会的知识分子优点和更广泛的影响审查标准来评估的。

项目成果

Assisted restoration interventions drive functional recovery of tropical wet forest tree communities

辅助恢复干预措施推动热带湿森林树木群落的功能恢复

• DOI: 10.3389/ffgc.2022.935011
• 发表时间: 2022
• 期刊: Frontiers in Forests and Global Change
• 影响因子: 3.2
• 作者: Werden, Leland K.;Zarges, Sebastian;Holl, Karen D.;Oliver, Chad L.;Oviedo-Brenes, Federico;Rosales, Juan Abel;Zahawi, Rakan A.
• 通讯作者: Zahawi, Rakan A.

Proximity and abundance of mother trees affects recruitment patterns in a long‐term tropical forest restoration study

在长期热带森林恢复研究中，母树的邻近性和丰富程度会影响补充模式

• DOI: 10.1111/ecog.05907
• 发表时间: 2021
• 期刊: Ecography
• 影响因子: 5.9
• 作者: Zahawi, Rakan A.;Werden, Leland K.;San‐José, Miriam;Rosales, Juan Abel;Flores, Jeffry;Holl, Karen D.
• 通讯作者: Holl, Karen D.