Water storage and redistribution in the forest floor affect percolation, evaporation and DOM loss

森林地面的水储存和重新分配影响渗透、蒸发和 DOM 损失

• 批准号: 502090760
• 负责人: Professor Dr. Markus Weiler
• 金额: --
• 依托单位: Professur für Hydrologie
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/502090760?language=en
• 关键词: Water; storage; redistribution; forest; floor

Forest floor (FF) is hydrologically highly relevant, but remains an only partiality explored nexus between precipitation, throughfall or stem flow, evaporation and infiltration into the soil. Particularly due to its changing properties in terms of thickness, physical properties and water repellency, which are largely unknow, specifically the spatial and temporal patterns. Overall leaching of dissolved organic matter (DOM) or dissolved organic carbon (DOC) from the FF into the soil are essential to describe the carbon balance of the FF. This proposal will study the spatial and temporal patterns of water fluxes in the FF in detail, linking its form and structure to the hydrological processes. This will be achieved by applying new forest floor grid-lysimeter, which include continuous in-situ measurements and DOM in the percolating water and novel experiments using wetting agents and dye tracer. But also the larger spatial patterns of FF thickness, type, vegetation and other properties will be measured and analyzed. We will link for the first time the spatial and temporal variability to the fluxes of DOM/DOC, as well as feedback mechanism to the atmosphere. This is even more relevant, when considering short and long-term changes of the FF due to climate change and changes in the composition of tree species including effects of droughts or warmer temperatures. The role of P1 in the FF-RU is to understand the hydrological properties and services of FF and their central role in water and nutrient fluxes as well as provide input for ecological modelling and many baseline datasets.

森林地面（FF）在水文学上是高度相关的，但在降水、穿透流或茎流、蒸发和渗入土壤之间的联系仍然是唯一的片面探索。特别是由于其在厚度，物理性质和拒水性方面的变化特性，这些特性在很大程度上是未知的，特别是空间和时间模式。土壤中溶解有机质（DOM）或溶解有机碳（DOC）的总体淋滤量是描述土壤碳平衡的必要条件。该提案将详细研究FF中水通量的时空格局，将其形式和结构与水文过程联系起来。这将通过应用新的森林地面网格渗滤仪来实现，其中包括连续的原位测量和渗透水中的DOM以及使用润湿剂和染料示踪剂的新实验。同时还将测量和分析更大范围内FF的厚度、类型、植被等特性的空间格局。我们将首次将时空变率与DOM/DOC通量以及对大气的反馈机制联系起来。当考虑到气候变化和树种组成变化（包括干旱或温度升高的影响）导致的FF的短期和长期变化时，这一点就更加相关了。P1在FF- ru中的作用是了解FF的水文特性和服务及其在水和养分通量中的核心作用，并为生态建模和许多基线数据集提供输入。