Coupled soil-plant water dynamics - Environmental drivers and species effects

土壤-植物水耦合动力学 - 环境驱动因素和物种影响

• 批准号: 185478468
• 负责人: Professor Dr. Arthur Gessler
• 金额: --
• 依托单位: Eidgenössische Forschungsanstalt WSL - Wald-Schnee-Landschaft
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/185478468?language=en
• 关键词: Coupled; soil; plant; water; dynamics

The predicted climate and land-use changes could have dramatic effects on the water balance of the soil-vegetation system in particular under drought conditions. However, information is scarce on temporal and spatial dynamics of soil water in the rooted soil horizons, the dynamics of plant water acquisition and on transpiration from plant leaves that will allow characterizing the effects of the predicted changes. The central aim of the planned project is to quantitatively characterise the interaction between plant water use – as affected by rooting patterns and physiology of different plant functional groups – and the hydrological water balance of an ecosystem. A main emphasis will be put on the effects of droughts and rewetting on this interaction. We will focus on the morphological and physiological parameters and on functional adaptations of plants to changes in soil water supply and stand specific proprieties, which drive water uptake capacity and actual water uptake. The effect of plants and vegetation on preferential flow paths, soil water storage, hydraulic redistribution and water infiltration capacity is in the second focus of this project. Until present short-term spatial and temporal dynamics of soil water movement and plant water uptake have never been characterised continuously in high temporal resolution. Such high-resolution approaches are, however, a prerequisite for understanding the water balance in ecosystems subjected to drought-rewetting transitions. As a consequence a methodological focus of this project is the further development and application of new innovative techniques that allow the continuous tracing of isotope signatures in soil water and transpiration.

预测的气候和土地使用变化可能对土壤-植被系统的水平衡产生巨大影响，特别是在干旱条件下。然而，信息是稀缺的时间和空间动态的土壤水分在根的土壤层，动态的植物水分采集和植物叶片的蒸腾作用，将允许表征预测的变化的影响。该计划项目的中心目标是定量分析植物水分利用（受不同植物功能群的生根模式和生理学影响）与生态系统水文水平衡之间的相互作用。一个主要的重点将放在干旱和复湿对这种相互作用的影响。我们将专注于形态和生理参数和植物的功能适应土壤水分供应和立场的具体属性，这驱动吸水能力和实际吸水的变化。本项目的第二个重点是植物和植被对优先流径、土壤蓄水、水力再分配和水渗透能力的影响。到目前为止，土壤水分运动和植物水分吸收的短期空间和时间动态特征从未连续高时间分辨率。然而，这种高分辨率的方法是了解遭受干旱-复湿过渡的生态系统的水平衡的先决条件。因此，该项目的方法重点是进一步开发和应用新的创新技术，以便能够持续追踪土壤、水和蒸腾作用中的同位素特征。