个人简介：

Sergio Rossi is professor of Forest Ecology at the Université du Québec à Chicoutimi, UQAC, Canada. His research focuses on quantitative ecology and ecophysiology, and in particular on modelling the responses of plants to multiple environmental factors and predicting the phenological adaptation of trees to climate changes. Investigations include long-lasting observations in permanent plots across wide geographical ranges, manipulated experiments in nature, assisted migration of ecotypes, and experimental designs under controlled environment. The actual projects focus on the dynamics of tree growth and reproduction at local to global scale and the effects of warming on forest productivity and the strategies of forest management in a context of changing climate. As a pioneer of the studies on wood formation in temperate and cold ecosystems and treeline ecotones, he has realized several meta-analyses on the recurrent timings of tree growth across the Northern hemisphere.

报告题目：

Synchronism, causality and determinism in wood formation: a question of time

报告摘要：

Trees synchronize their growth cycles with the seasonal variations in weather conditions, an essential aspect in ecosystems characterized by wide climatic differences between favorable and unfavorable periods for the physiological activities. Wood formation, or xylogenesis, is a complex and fascinating example of an intermittent growth process sensitive to temperature that can be studied at several time scales. The period of wood formation is the time window during which the xylem is under differentiation. Environmental factors can then act directly on the cells forming the tree ring and, consequently, on the characteristics of the resulting wood and its properties. During the presentation, the dynamics of xylem cell maturation and their interactions will be described and compared to the limiting factors of cold ecosystems. The results will demonstrate the importance of the new knowledge on cambial phenology for understanding the physiology and ecology of wood formation in trees.

 

个人简介：

四川大学生命科学学院教授，博士生导师，入选国家级青年人才项目，主要研究方向为全球变化生态学和森林生态学，主要基于物候学和树木年轮学，结合大数据分析、野外样地监测、室内控制实验等手段，在不同尺度探究全球气候变化对树木生长和森林生态系统的影响，近年来，以第一或通讯作者Nature Climate Change、Nature Communications、Global Change Biology (6篇)、 Agricultural and Forest Meteorology、Tree Physiology等国际主流学术期刊上发表了多篇学术研究论文。

报告题目：

全球气候变化对北半球树木物候的影响

报告摘要：

树木物候变化不仅可以改变生长季长度进而对森林生产力造成影响，也会影响森林冠层与大气之间碳、水和能量的交换和平衡。近年来，因气候变暖导致的树木春季和秋季物候变化受到了越来越多的关注，解析树木物候对气候变化的响应模式及其驱动机制对于准确的评估和预测未来气候变化对森林生态系统结构和功能及陆地碳汇的影响具有重要的意义。本次报告将首先简要介绍树木物候学研究的重要意义和目前的研究进展，然后介绍温度等外在的气候环境因子以及光合碳同化等树木内在生理过程对北半球树木春季和秋季物候的影响，最后对树木物候学研究进行简单的展望。