微齿眼子菜的功能性状测算及其与水体环境因子的动态耦合机制研究

Submersed vegetation plays a key role in the functioning of shallow lakes, which is definitely dependent on a set of specific traits and their amounts of the vegetation. In the present study, experiments and field investigations were carried out to examine the parameters (growth rate, death rate and deciduous rate, etc.) relating to population dynamics of Potemogeton maackianus as well as the plant specific traits values (uptakes and storage of carbon, nitrogen and phosphorus, photosynthetic oxygen production, shading effects), which were used for developing a model that would quantitatively couple the plant functional traits to its habitat environmental indices in a whole lake. On behalf of modeling, we would analyze the plant population dynamics and its decline in scenarios of high temperature, flooding and herbivory, so as to look insight the cleaning water mechanisms of submersed macrophyte and the critical vegetation area for regimes shifts. Five issues were focused: (1) the effects of water temperature and nutrients levels on photosynthesis, respiration and nutrients upake of P. maackianus in short-term experiments; (2) the effects of nutrients and light levels on population dynamics and functional traits of P. maackianus and modeling of the population dynamics; (3) field survey on the plant population dynamics, functional traits and its habitat properties in lakes; (4) modeling the plant population dynamics in relation to its habitat environments; (5) to examine quantitative relationships between the functional traits and its environmental indices, as well as the mechanisms on cleaning water of the plant.

沉水植被对浅水湖泊的生态功能起到关键作用，并与其特定性状及数量密切相关。本研究拟采用受控实验和湖泊调查获取微齿眼子菜的种群动态参数（生长、死亡和凋落等）和功能性状（植被对碳氮磷的吸收与储量、光合放氧量和遮光效应等）的特征值，并基于碳收支平衡构建植物的功能结构模型，测算全植被的功能性状值并分析其与水环境因子的定量关系；基于数值模拟，分析多情景下（高温、淹水和牧食等）植被的动态与灾变过程，旨在阐明沉水植被的清水机制及稳态转换的植被面积阈值。包括5方面内容：（1）温度和营养对微齿眼子菜的光合、呼吸及营养吸收的短期影响；（2）不同营养和光照水平对微齿眼子菜的种群与功能性状的中长期影响及构建种群动态模型；（3）自然湖泊中微齿眼子菜的种群与功能性状及环境因子的监测；（4）自然湖泊中微齿眼子菜种群动态与水环境因子的耦合模型研究；（5）自然湖泊中微齿眼子菜种群的功能性状与环境因子的动态定量关系及其清水机制

沉水植被对浅水湖泊的生态功能起到关键作用，并与其特定性状及数量密切相关。本研究拟采用受控实验和湖泊调查获取微齿眼子菜的种群动态参数（生长、死亡和凋落等）和功能性状（植被对碳氮磷的吸收与储量、光合放氧量和遮光效应等）的特征值，并基于碳收支平衡构建植物的功能结构模型，测算全植被的功能性状值并分析其与水环境因子的定量关系；基于数值模拟，分析多情景下（高温、淹水和牧食等）植被的动态与灾变过程，旨在阐明沉水植被的清水机制及稳态转换的植被面积阈值。包括5方面内容：（1）温度和营养对微齿眼子菜的光合、呼吸及营养吸收的短期影响；（2）不同营养和光照水平对微齿眼子菜的种群与功能性状的中长期影响及构建种群动态模型；（3）自然湖泊中微齿眼子菜的种群与功能性状及环境因子的监测；（4）自然湖泊中微齿眼子菜种群动态与水环境因子的耦合模型研究；（5）自然湖泊中微齿眼子菜种群的功能性状与环境因子的动态定量关系及其清水机制。