Solifluction meets vegetation: the role of biogeomorphic feedbacks for turf-banked solifluction lobe development
Solifluction meets vegetation: the role of biogeomorphic feedbacks for turf-banked solifluction lobe development
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DOI：
10.1002/esp.4102
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发表时间：
2017-09-15
影响因子：
3.3
通讯作者：
Dikau, Richard
中科院分区：
文献类型：
--
作者：
Eichel, Jana;Draebing, Daniel;Dikau, Richard
植被是影响溶蚀过程的重要因素，同时溶蚀过程和地貌也影响着物种组成、精细尺度分布和相应的生态系统功能。然而，植物与沉降过程之间的反馈如何影响草滩沉降叶（TBLs）的发育及其地貌和植被模式仍然知之甚少。我们在Turtmann冰川前陆（瑞士）的详细生物地貌调查中解决了这一知识差距。采用的方法包括地貌和植被填图、无人机地形评估和温度测量。结果随后与以前的地貌学和生态学研究的知识整合到一个概念模型中。研究结果表明，地形地貌与植被格局通过叶面要素、踏面要素、上升要素和山脊要素紧密联系在一起。以矮灌丛八脚木生态系统工程为主导过程的四阶段生物地貌概念模型可以解释这些相互关联的模式。基于该模型，我们证明了tbl是一种生物地貌结构，并遵循循环发展，在此期间其组成部分对工程物种和非工程物种的作用发生了变化。我们的研究提出了第一个TBL发展的生物地貌模型，并强调了生物地貌方法和研究在冰缘环境中的适用性和必要性。版权所有：John Wiley & Sons， Ltd。
Vegetation is an important factor influencing solifluction processes, while at the same time, solifluction processes and landforms influence species composition, fine-scale distribution and corresponding ecosystem functioning. However, how feedbacks between plants and solifluction processes influence the development of turf-banked solifluction lobes (TBLs) and their geomorphic and vegetation patterns is still poorly understood. We addressed this knowledge gap in a detailed biogeomorphic investigation in the Turtmann glacier foreland (Switzerland). Methods employed include geomorphic and vegetation mapping, terrain assessment with unmanned aerial vehicle (UAV) and temperature logging. Results were subsequently integrated with knowledge from previous geomorphic and ecologic studies into a conceptual model. Our results show that geomorphic and vegetation patterns at TBLs are closely linked through the lobe elements tread, risers and ridge. A conceptual four-stage biogeomorphic model of TBL development with ecosystem engineering by the dwarf shrub Dryas octopetala as the dominant process can explain these interlinked patterns. Based on this model, we demonstrate that TBLs are biogeomorphic structures and follow a cyclic development, during which the role of their components for engineer and non-engineer species changes. Our study presents the first biogeomorphic model of TBL development and highlights the applicability and necessity of biogeomorphic approaches and research in periglacial environments. Copyright (c) 2016 John Wiley & Sons, Ltd.