Evapotranspiration of beech stands as indicator for water supply and competition for water under different climate conditions

研究小组的这个子项目由密切相关的实验和模拟部分组成，重点是山毛榉林分及其组成部分的蒸散。结合不同深度的土壤水分，蒸散量被认为是水分有效性和水分竞争的一个指标。将持续测量和分析主要研究站点图特林根以及卫星站点Sisteron和Schönberg的天气和气候条件的所有基本变量。为了研究蒸散对当地天气和气候条件的响应，在林分尺度上，感热和潜热的湍流通量将通过EC方法进行监测。此外，冠层和林下植被之间的蒸腾分配作为竞争水分的指标，将使用分支袋系统解决。与实验研究平行，水平衡模型BROOK 90将在每个研究地点实施，以模拟山毛榉林分水平衡的单个项，并根据现场测量结果进行验证。BROOK90代表了研究小组开发和测试的过程导向生物地球化学模型的重要组成部分。

This subproject within the Research Group consists of intimately connected experimental and simulation parts focussed on the evapotranspiration of beech stands and its components. In combination with the soil moisture in different depths, evapotranspiration is regarded as an indicator for water availability and competition for water. All basic variables to characterise weather and climate conditions at the primary research site Tuttlingen as well as the satellite sites Sisteron and Schönberg will be continuously measured and analysed. To investigate the response of evapotranspiration on local weather and climate conditions on the stand scale, turbulent fluxes of sensible and latent heat will be monitored by the EC method. Furthermore, partitioning of transpiration between canopy layer and understory vegetation as an indicator for competition for water will be addressed using branch bag systems. Parallel to the experimental studies, the water balance model BROOK90 will be implemented at each of the research sites to simulate the single terms of the water balance of the beech stands validated against measurements on the sites. BROOK90 represents an essential part of the process orientated biogeochemical model developed and tested within the research group.