细根功能性状多样性决定着植物水分和养分吸收等重要功能对不同环境条件的适应。单一的功能性状研究框架无法满足细根响应环境变化的地下策略多样性研究的科学需求。而现代超体积思想业已成为破解制约人们透彻理解和科学预测地下生态过程瓶颈难题的重要理论。本项目依托长白山阔叶红松林内长期大型野外施氮、控水双因子试验平台，率先从多维性状空间的独到视角，运用融合细根大小、形状、解剖、功能分区及菌根侵染的研究体系，阐述阔叶红松林主要树种细根功能性状在细根个体、树种个体和树种水平上的概率分布、非均等性对多年氮、水交互作用的响应特征；构建细根大小形状谱和细根功能性状超体积空间，及其与树种地上特征、土壤理化性质、功能性状概率分布和非均等性的关联模型，以明确影响细根功能多样性的主要因子，进而揭示长白山阔叶红松林细根对多年氮、水交互的适应机制，为全面深入理解温带森林细根功能多样性及其对气候变化的响应提供新颖视角和科学依据。

The diversities of fine root functional traits determine the adaptations of functions in water and nutrient absorption of plants to different environments. The simplex functional trait framework cannot satisfy research demands on responses of fine root strategy to environmental changes. While modern hypervolume concept has become an important theory to solve the bottleneck problem that severely limits our thorough understanding and scientific predicting on underground ecological processes. This research is based on the long-term nitrogen-water interation experiment platform in the primitive broad-leaved Korean pine mixed forest in Changbai Mountain. In this project, focusing on the unique multidimensional trait space, we will apply the frame of research work that involves fine root size, shape, function zone, anatomy and mycorrhizal infection. We will construct fine root functional trait hypervolume, size and shape spectrum, and their correlative models with above-ground characteristics of tree species, soil physicochemical properties, probability distribution and inequality of functional traits to identify the main factors affecting functional diversity of fine roots. We expect to interpret the adaptation mechanism of fine roots to long-term increasing nitrogen deposition and decreasing precipitation in the broad-leaved Korean pine mixed forest. Our results will provide novel perspectives and scientific evidences for deeply understanding on the responses of fine root functional diversity of the temperate forests to climate change.