毛乌素沙地油蒿（Artemisia ordosica）功能性状协变及其可塑性研究

植物功能性状对环境变化的响应是生态学研究的热点。以往研究多集中在物种间功能性状的植物经济谱，对种内个体发育过程中功能性状间的协变权衡关系鲜有报道。本研究以荒漠灌木油蒿（Artemisia ordosica）为研究对象，通过在不同器官（叶、茎、根）的形态、生理、生化功能性状及环境因子的原位连续观测，研究油蒿在时间尺度上功能性状间的协变权衡、环境可塑性及其对变化环境的适应策略。拟验证假设：（1）不同功能性状对环境胁迫的可塑性不同；（2）不同类型功能性状间权衡关系在不同的环境条件存在不同的格局；（3）植物在生长过程中通过不断调整各器官内、器官间物质分配比来适应环境变化。拟回答科学问题：（1） 功能性状的环境可塑性幅度多大？功能性状间如何协变权衡适应变化环境？（2）器官间碳:氮及生物量分配如何随环境变化？其协变权衡策略是什么？研究结果将为荒漠生态系统适应气候变化政策和行动计划的制定提供科学依据。

The responses of plant functional traits to environmental changes have been one of the focuses in plant ecology. The spatially inter-species relationships in plant functional traits have been well documented. The coordination and trade-offs between functional traits at temporal scale within species in relation to fluctuated environments remain unclear. This program is planning to measure morphological, physiological and biochemical traits of leaf, stem and root in situ, manually and by lab analysis for Artemisia ordosica. It is intended to test the hypothesis: environmental plasticity of functional traits vary with one another. Plant acclimates to fluctuation of environment through coordination and trade-offs between functional traits and through partitioning of carbon and nitrogen among organs (leaf, stem and root). It is aimed to answer two scientific questions: (1) how big is the plasticity of each of functional traits and how does different types of functional traits coordinate and trade-offs in acclimation to changing environments; (2) how does carbon and nitrogen partition between organs over the season in response to changing environments and what is trade-off strategies of the partitioning? The goal is to understand the plastic responses and ecological strategies to cope with changing environments at temporal scale in order to inform policy making for adaptation of desert ecosystems to climate change.