CRB: Restoring Seasonal Tropical Forests in Mexico: Using Designer Communities to Direct Succession

CRB：恢复墨西哥季节性热带森林：利用设计师社区指导继承

• 批准号: 9981607
• 负责人: Edith Allen
• 金额: $ 25.15万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9981607&HistoricalAwards=false
• 关键词: CRB; Restoring; Seasonal; Tropical; Forests

9981607AllenThe proposed research follows upon current research on mycorrhizae and ecophysiology of planted trees in seasonal tropical forest. Defining measurable goals for restoration is one of the central issues in restoration ecology, and is especially problematic in species rich and disturbed systems such as seasonal tropical forests. Designer communities will be established to initiate succession in two sites, and measure the feedbacks that developing communities have on 1) ecophysiological characteristics of trees over time, 2) biodiversity of colonizing plant species, 3) mycorrhizal fungal diversity and effects on plant growth, and 4) soil properties. Because of the high beta diversity in tropical forest, the original species composition can not be duplicated, but species with defined ecophysiological characteristics can be selected that may either slow or hasten succession. These characteristics include fast and slow-growing plants, sun and shade plants, large and small-seeded species, drought tolerance, C/N of leaf tissue, wood density, and others. Three kinds of communities will be established, late seral, early seral, and a mix of seral species. Experiments will test the hypothesis that the growth rate and seral status of the managed community will have different feedbacks on community and soil properties. The rate of canopy closure will vary, as will animal seed dispersers and diversity of plant colonization. Overall, this project will provide needed information on the value of designer communities as a mechanism to direct succession and restore native vegetation to degraded tropical lands.

9981607 Allen本研究是在当前对季节性热带森林中人工种植树木的真菌学和生理生态学研究的基础上进行的。确定可测量的恢复目标是恢复生态学的核心问题之一，特别是在物种丰富和受干扰的系统，如季节性热带森林的问题。将建立设计社区，以启动两个地点的演替，并测量发展中社区对1）树木随时间推移的生理生态特征，2）殖民植物物种的生物多样性，3）菌根真菌多样性和对植物生长的影响，以及4）土壤特性的反馈。由于热带森林的高β多样性，原始物种组成不能复制，但可以选择具有明确生理生态特征的物种，这可能会减缓或加速演替。这些特征包括快生和慢生植物、阳生和阴生植物、大种子和小种子物种、耐旱性、叶组织的C/N、木材密度等。将建立三种类型的社区，晚演替系列，早期演替系列，和演替系列物种的混合。实验将检验这一假设，即管理的群落的生长速度和演替状态将对群落和土壤性质产生不同的反馈。林冠关闭的速度会有所不同，动物种子传播者和植物定植的多样性也会有所不同。总体而言，该项目将提供必要的信息，说明设计师社区作为一种机制的价值，以指导退化热带土地的演替和恢复原生植被。