作物种质资源格局是在历史过程、当前环境要素以及人类活动的共同作用下形成的，是作物功能性状、遗传和环境耦合的结果。解析和量化作物功能性状和遗传资源格局形成的驱动因子及影响程度，是当前作物种质资源研究面临的一个重要挑战。本项目拟选取西南山地及毗邻区具有重要经济和生态价值的特有树种泡核桃为研究对象，基于性状、遗传和环境数据，综合运用群落生态学、功能生态学、居群遗传学和物种分布区模拟等多学科交叉的研究方法，通过性状和遗传的多样性和结构分析，厘清泡核桃种质资源格局；利用瓶颈效应检测和基因流估算，揭示栽培群体的起源模式；借助群体历史分析和物种分布区模拟，探究野生群体资源格局的时空演化过程；基于性状、遗传和环境的耦合分析，阐明作物种质资源格局形成的驱动因子及其影响程度。研究结果将不仅有助于加深对木本作物栽培起源和种质资源格局形成机制的理解，而且也将为泡核桃种质资源收集保存和挖掘利用提供科学依据。

The spatial distribution of germplasm, which is closely related to functional traits, genetics and environment, is a product of historical processes and contemporary environmental factors, as well as anthropogenic activities. An unresolved challenge in germplasm research is to disentangle and quantify the relative effects of these processes, which shape genetic and functional structure across species. In this study, we will study the economically and ecologically important Juglans sigillata, which is a regional endemic tree crop in the Mountains of Southwestern China and adjacent regions, as a study model to examine the functional trait and genetic diversity patterns, and their correlations with historical climate change and contemporary environmental factors using functional traits (eg. leaves, fruit etc.), genetic data (cpDNA sequence and SSR genotyping plus RAD-seq) and environmental data (geographical, climatic etc.), using a multidisciplinary approach combining community ecology, functional ecology, population genetics and species distribution modelling. The major objectives are: (1) to determine the distribution patterns of functional traits and genetic diversity; (2) to reveal the origin and domestication model of cultivated populations; (3) to unravel the spatial-temporal evolutionary history of the wild progenitor; (4) to disentangle and quantify the roles of environment factors in generating observed germplasm patterns, and the associations among trait, genetic and environment factors. The project will not only help us to understand the domestication model and germplasm maintenance mechanisms of tree crops, but also will provide valuable insights for the germplasm conservation and utilization of Juglans sigillata.