树木年轮与环境演变研究组成立于2012年，立足我国西南地区热带、亚热带森林生态系统，通过树木年代学、树木生理生态学、生态热力学等多技术手段应用和多学科交叉，瞄准相关科学发展前沿和热点问题，开展热带亚热带森林关键类群乃至生态系统对区域气候和环境变化的响应研究，为评估全球变化背景下生态系统响应提供科学依据。
研究方向
Research area
立足我国西南至东南亚地区，以热带和亚热带森林生态系统为研究对象，结合树木年代学、树木生理生态学、稳定性同位素等多种技术手段应用和学科交叉，研究区域历史和现代气候变化的时空特征、热带亚热带森林树木径向生长的季节动态及其对气候因子的响应、热带亚热带森林树木生长速率的长期变化趋势及驱动因子、热带亚热带森林关键类群的生长和生理过程对环境梯度或模拟气候变化的响应，为评估全球变化背景下森林生态系统响应提供科学依据。
Tree Ring and Environmental Change Group (TREC), set up since June 2012, belong to the Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden (XTBG), Chinese Academy of Sciences (CAS). TREC group focuses on dendrochronology and climate change in the tropical and subtropical regions of Southwest China and Southeast Asia. By combining dendrochronology, tree ecophysiology, and tree ring stable isotopes, we study regional climate history via tree-ring based climate reconstruction; we investigate intra- to inter-annual radial growth and climate sensitivity of tropical/sub-tropical tree species; we detect long-term trends of tree growths and physiological processes (iWUE) across various ecosystems from the tropical rainforests to high mountainous temperate forests. We also investigate physiological and morphological adaptations of tropical and subtropical trees to simulated environmental change (i.e. CO2 enrichment, drought, global warming). Our researches aim to provide scientific basis for evaluating vulnerability of forest ecosystems under a changing climate.
研究内容
Research topics
内容1：中国西南-东南亚地区历史和现代气候变化时空特征
Regional climate history and spatiotemporal characteristics
采用树木年轮气候学技术，重建澜沧江-湄公河流域的干旱指数和河流径流量变化历史，探讨气候变化对区域水资源的可能影响；通过气候统计诊断，检测区域历史和现代气候变化的趋势特征、突变时间和周期规律，探讨区域历史和现代气候变化的时空特征。
By using dendrochronology methods, we attempt to reconstruct climatic change for the regions of Himalaya, southern Tibetan Plateau, tropical and subtropical Asia during the past centuries. We also study spatiotemporal changes of climate variables in Southwest China and Southeast Asia during the past decades by using meteorological data and statistical diagnosis.
内容2：热带亚热带森林树木径向生长季节动态及其对环境因子的响应
Intra- to inter-annual tree growth and their responses to environmental factors
在热带雨林和亚热带常绿阔叶林建立树木现代过程观测体系，持续观测代表性树种径向生长（形成层活动）和生理活动（光合、水分等）的季节动态变化，与短期气候和环境因子变化关联分析，探讨热带亚热带树木径向生长和生理特征的季节和年际动态规律，构建环境因子-树木生理-生长动态的机理模型，探讨热带亚热带森林树木径向生长的环境因子调控机制。
Based on established research platform that monitoring intra- to inter-annual tree radial growth (dendrometers, micro cores, wood anatomy) and water relations (sap flow, hydraulic), we study intra- to inter-annual growth patterns of tree species in the tropical rainforests and subtropical evergreen forests. We investigate daily to seasonal radial growth dynamics and related physiological processes (photosynthetic, water relations) and their responses to environmental factors, and attempt built climate-physiology-growth process models, which will help to explore the physiological regulation mechanism of radial growth of trees in tropical and subtropical forests.
内容3：典型森林树木生长速率和生理特征的长期变化趋势及其驱动因子
Long-term growth trends and driving forces of tropical and subtropical forest
结合群落调查和样方年轮取样技术，研究热带亚热带森林代表性树种径向生长速率和生产力的长期变化趋势，结合木质部解剖分析和稳定同位素技术，研究树木生理特征（碳积累、水分利用）的长期变化趋势，甄别生物因子（竞争）和环境变化（温度升高、降水改变、CO2浓度升高等）对树木生长速率和生理过程的相对贡献，揭示热带亚热带森林关键树种生长速率和森林生产力的长期变化趋势及其驱动因素。
Combing forest plot survey and dendrochronological techniques, we investigate long-term trends of tree growths in tropical and subtropical ecosystems. We study long-term trends of tree physiological processes (carbon sequencing, water use) by using quantitative wood anatomy and stable isotope techniques. We analyze the contributions of biotic (competition) and abiotic (temperature, precipitation, CO2) factors that driving the changes of tree growths. Our study aims to disentangle short-to-long term responses of tree growth and forest productivity to environmental changes, and evaluate forest ecosystem vulnerability under a changing climate.
内容4：热带亚热带森林关键类群生理生态过程及其对环境变化的响应
Functional traits and eco-physiological responses to environmental change in tropical and subtropical forests
在人工模拟环境改变（CO2浓度升高、干旱、增温）条件下，研究热带、亚热带关键类群植物的光合生理、水力结构、生长等对环境变化的响应特征，探讨环境变化如何影响植物的光合碳积累、生长以及生物量分配模式。
Using manipulated experiments, we study tree photosynthetic, water relations, and growth of representative tree species in the tropical and subtropical ecosystems. We investigate plant carbon sequencing, hydraulic architecture, biomass allocation and their responses to enriched CO2 concentration, drought, warming as well as their interactions. Our study aims to evaluate the potential changes of tree growth and species distribution under a changing climate.
发展目标
Research objectives
聚焦热带亚热带森林生态系统对全球气候和环境变化的响应与适应这一关键科学问题，通过树木年代学、组织解剖学、树木生理生态学等多学科交叉，深入解析我国西南至东南亚热带亚热带森林树木生长动态及其环境调控机制，为热带亚热带森林生态系统的经营管理和保护提供科学依据。在热带亚热带树木年轮生态学研究和生态系统对环境变化响应方面做出创新性贡献，打造一支具有活跃创新能力、在国内国际有一定影响力的研究团队。
Based on tropical and subtropical regions of Southwest China and Southeaste Asia, TREC group focuses on climatic changes and their impacts on forest ecosystems of tropical and subtropical forests. We combine the techniques of dendrochronology, quantitative wood anatomy, tree ecophysiology, and study long-term trends of tree growths and their physiological processes as well as their responses to environmental changes. We aim to disentangle short-to-long term responses of tree growth and forest productivity to environmental changes. Our research may provide insight to forest sustainable management and conservation. We target to contribute innovative research, improve research capacity and build outstanding research team in near future.
联系我们
Contacts
Email: fanzexin@xtbg.org.cn
地址：云南省勐腊县勐仑镇中国科学院西双版纳热带植物园
Address: Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences
Menglun Town, Mengla County, Yunnan Province 666303, P.R. China