人工毛竹林根冠关系及其水热传输效应研究

Planted bamboo forest is the main economic forest in the south of China. In recent years, the planting area has continued to increase. With the significant economic benefits, the ecological and hydrological effects caused by its area change have attracted widespread attention from all walks of life. In this project, field observations in a typical small watersheds and potted experiments were used to quantitatively describe the relationship between roots and shoots of planted bamboo forests, select the vegetation transpiration estimation model which based on root parameters and canopy parameters, verify the equivalence of those models, by the methods of Scale conversion, parameter optimization, model simulation, and mathematical statistics. The aims of the project are to explore the methods of vegetation transpiration estimation based on root-shoot relationships, and to clarify the effects of hydrothermal transfer of roots and shoots during the vegetation transpiration and the quantitative relationship between the parameters of roots and shoots reveals the law of transpiration changes caused by vegetation changes and clarifies the mutual feedback mechanisms of the roots and shoots of the vegetation in the process of hydrothermal transmission. The research results are of great significance for understanding the water behavior of plants, improving the existing estimation method of vegetation transpiration, clarifying the hydrological response of vegetation changes, and building an conservation culture.

人工毛竹林作为我国南方主要经济林，近年来种植面积持续增加，在带来显著的经济效益的同时，其面积变化引起的生态水文效应引起了社会各界的广泛关注。本项目通过野外典型小流域定位观测和盆栽实验，运用尺度转换、参数优化、模型模拟和数理统计等方法，来定量描述人工毛竹林的根冠关系，筛选基于根系参数和冠层参数的植被蒸腾估算模型，验证基于根系参数和冠层参数的蒸腾估算模型在毛竹林蒸腾估算中的等效性，以探索基于根冠关系的植被蒸腾估算方法，明晰植被蒸腾过程中根系和冠层的水热传输效应及其参数间的定量关系，揭示植被改变引起的蒸腾变化规律，阐明植被根系和冠层在水热传输过程中的互馈机制。研究结果对认识和理解植物水分行为、完善现有植被蒸腾估算方法、厘清植被变化的水文响应、建设生态文明社会具有重要意义。

人工毛竹林对于气候变化的响应和流域生态功能及降水径流关系的影响日渐受到重视。本研究通过定位观测和模拟计算，初步揭示了毛竹水分消耗规律，明晰了人工毛竹林土壤水分的时空演化及其对气候变化的响应；此外，毛竹林的生态功能对于流域水文过程的影响也是本研究的关注点，即初步探索了流域植被、土地利用等变化如何影响其降水径流特征，不同概念性水文模型，特别是其中的蒸散模块对于不同气候区流域的适用性，为流域变化的定量表达及水文模型的适用性研究进行了有益的探索。