Tropical Dry Forests: Remote sensing and ecological fingerprints of ecosystem succession

热带干燥森林：生态系统演替的遥感和生态指纹

• 批准号: RGPIN-2015-04009
• 负责人: SanchezAzofeifa, Gerardo
• 金额: $ 2.91万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=688137
• 关键词: Tropical; Dry; Forests; Remote; sensing

Seasonally dry tropical forests (TDFs) account for 42% of all tropical forests and contain a wealth of unique biodiversity. Plant species in this ecosystem are characterized by slower growth rates, restricted reproductive episodes, and more structural and physiological diversity than found in tropical rainforests. TDFs are important reservoirs of ecosystem services for communities around the world. In the Americas, alone, it is estimated that nearly 60 million people benefit from the services that they provide (e.g. water production, pollination). Despite of their importance, little is known about these ecological, biophysical/hydrological processes and their linkages to these ecosystems' services. ******The objective of the proposed research program aims to fill key knowledge gaps related to how TDFs may respond to climate change and, in turn, the consequent shifts produced in their ecosystem services. Short-term goals of my research program focus on three specific research areas: (1) Characterization of the spectral reflectance of lianas and trees in the long-wave thermal infrared: I propose to expand our past work at the leaf level into the long-wave thermal infrared (TIR: 7.5µm to 12.5µm) to explore differences between lianas and trees and the mechanisms that control the reflectance in TIR; (2) Quantifying TDF response to climate change: This component of my work will aim to determine if TDFs are nearing high temperature thresholds that would affect their CO2 uptake as well as their phenological response using key variables such as CO2/H2O fluxes and the Fraction of Photosynthetically Active Radiation (FPAR); (3) Quantifying the impact of lianas on TDFs' structure: As lianas become more dominant in tropical environments, I propose to examine - using ground LiDAR derived technologies - the impact that they have on TDFs' structure across different levels of ecological succession. Over the long-term: My research program will contribute to scientific knowledge in the nexus between remote sensing and ecological processes across different stages of secondary regeneration. ******I expect that the outcome of my work will assist policy makers in developing cost-effective, results-oriented methods for preserving TDFs across the Americas.**

季节性干燥的热带森林（TDFS）占所有热带森林的42％，并且包含大量独特的生物多样性。该生态系统中的植物物种的特征是生长速度缓慢，繁殖发作限制以及比热带雨林中发现的结构和身体多样性更多。 TDF是世界各地社区生态系统服务的重要储层。仅在美洲，据估计，将近6000万人从他们提供的服务中受益（例如，水生产，授粉）。尽管它们的重要性，但对这些生态，生物物理/水文过程及其与这些生态系统服务的联系知之甚少。 *****拟议的研究计划的目的旨在填补与TDF可能如何应对气候变化以及随之而来的生态系统服务中产生的转变有关的关键知识差距。我的研究计划的短期目标集中于三个特定的研究领域：（1）在长波热红外线中的光谱反射率的表征：我建议将过去在叶子水平的过去工作扩展到长波热红外（TIR：7.5µm：7.5µm至12.5µm），以探索Lianas和Trees and The Trees and The Ongients and The Ondigonisss的差异，以控制Lianas和The Ondivalsiss的差异。 （2）量化TDF对气候变化的响应：我的工作的这一组成部分将旨在确定TDF是否接近会影响其CO2吸收的高温阈值，以及使用CO2/H2O磁通等关键变量（例如光辐射辐射（FPAR））的关键变量（如CO2/H2O）； （3）量化LIANAS对TDFS结构的影响：随着LIANAS在热带环境中变得越来越占主导地位，我建议使用地面LIDAR衍生技术检查 - 它们对TDFS在不同级别的生态成功层面的结构中产生的影响。从长远来看：我的研究计划将有助于远程敏感性和二次再生阶段的生态过程之间的科学知识。 *****我希望我的工作结果将有助于政策制定者开发以成本效益，面向结果的方法来保存整个美洲的TDF。**