中国季风-大陆过渡带树轮多指标的水文气候信号挖掘及其响应机制

全球水文气候变化对人类经济社会和生态环境产生了深刻而直接的影响，迫切需要了解长期水文气候变化规律。以中国季风-大陆过渡带为研究区，对六处典型区域的七类典型优势树种进行取样，分析测试8项树木年轮指标，构建200-350年七类典型树种11组树木年轮的8项单指标年表以及组合指标年表；深入挖掘不同树轮指标及其组合指标中蕴含的水文气候信号，揭示不同树轮指标及其组合指标对水文气候要素的各自响应过程和响应机制，以及其综合响应机制；重建研究区200-350年不同典型地区水文气候要素历史序列，分析揭示水文气候要素的时空变异性；明确树木年轮指标和重建的水文气候要素时空变异的全球驱动力，揭示其对全球变化的响应过程和响应机制，建立耦合模拟模型，耦合模拟全球变化下树木年轮指标和水文气候要素的变化，提出应对方案。以此丰富全球树轮库和水文气候历史长序列数据库，亦为区域经济社会可持续发展、生态环境改善提供参考。

Global hydrological climate change has a profound and direct impact on human economic society and ecological environment. It is urgent to understand the long-term hydrological climate change and its forcing mechanism.Taking the monsoon-continental transition zone of China as the research area, seven types of typical dominant tree species in six typical areas were sampled, 8 tree ring indexes were analyzed and tested, and 8 single indicator chronology and combined indicator chronology of 11 groups of tree rings of seven typical tree species in 200-350 years were constructed.The hydroclimatological signals contained in the indicators of different tree wheels and their combinations are deeply excavated to reveal the respective response processes and response mechanisms of the indicators of different tree wheels and their combinations to hydroclimatological elements, as well as their comprehensive response mechanisms.To reconstruct the historical sequence of hydroclimatic factors in different typical areas from 200 to 350 years in the research area and analyze the spatial and temporal variability of hydroclimatic factors;The global driving force of temporal and spatial variation of tree ring index and reconstructed hydroclimatic factors was identified, and its response process and response mechanism to global change were revealed. A coupling simulation model was established to simulate the changes of tree ring index and hydroclimatic factors under global change.In this way, we can enrich the global tree wheel database and the database of hydrology and climate history, and provide reference for the sustainable development of regional economy and society and the improvement of ecological environment.