Water Relations of Beech and Interacting Vegetation in Beech-Dominated Forests

山毛榉为主的森林中山毛榉与植被的水关系

• 批准号: 27152584
• 负责人: Professor Dr. Arthur Gessler
• 金额: --
• 依托单位: Institut für Bodenökologie (IBOE) (aufgelöst)
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/27152584?language=en
• 关键词: Water; Relations; Beech; Interacting; Vegetation

Three highly interconnected though independent approaches [a) xylem flow measurements, b) stable isotope analysis/modelling, c) a hydrodynamic model system PLATHO/Expert-N] are applied for assessing water relations of trees and co-occurring vegetation on different time-scales on a whole plant level. Water flow/movement within the plant and partitioning between species will be modelled and additionally analysed using sap flow sensors, leaf level gas exchange and by tracing (18O and (D in potential water sources and in xylem water. (18O, (D and (13C in organic pools with different turn over-times will be assessed to characterise responses of stomatal conductance (gs) and transpiration (T) to environmental conditions. In addition, isotopic signatures will be used to predict gs and T applying process-oriented models. Based on the model system Expert-N and the functional-structural plant growth model PLATHO a tree hydrodynamic model for beech will be developed. The model will be applied to simulate soil-plant-air system water relations including mycorrhiza effects on water uptake from soil and will be inserted as tree water flow sub-model to the ecosystem-scale model. Both, the isotopic approach and the hydrodynamic model will be calibrated and validated with measurements at the three field sites. Cross-validation between the two independent approaches will be carried out at additional sites.

三种高度互连但独立的方法[a)木质部流量测量，b)稳定同位素分析/建模，c)水动力模型系统PLATHO/Expert-N]用于评估整个植物水平上不同时间尺度上树木和共生植被的水关系。植物内的水流/运动以及物种之间的分配将使用液流传感器、叶级气体交换以及通过追踪潜在水源和木质部水中的(18O和(D)进行建模和额外分析。将评估具有不同周转时间的有机池中的(18O、(D和(13C))以表征气孔导度(gs)和蒸腾作用(T)对环境条件的响应。此外，同位素 签名将用于应用面向过程的模型来预测 gs 和 T。基于模型系统 Expert-N 和功能结构植物生长模型 PLATHO，将开发山毛榉树木水动力模型。该模型将用于模拟土壤-植物-空气系统的水关系，包括菌根对土壤吸水的影响，并将作为树木水流子模型插入生态系统规模模型。两者， 同位素方法和流体动力学模型将通过三个现场的测量进行校准和验证。两种独立方法之间的交叉验证将在其他地点进行。