Arid
DOI10.1002/esp.4299
Transformation of parabolic dunes into mobile barchans triggered by environmental change and anthropogenic disturbance
Yan, Na1,2; Baas, Andreas C. W.1
通讯作者Yan, Na
来源期刊EARTH SURFACE PROCESSES AND LANDFORMS
ISSN0197-9337
EISSN1096-9837
出版年2018
卷号43期号:5页码:1001-1018
英文摘要

Parabolic dunes are widely distributed on coasts and margins of deserts and steppes where ecosystems are vulnerable and sensitive to environmental changes and human disturbances. Some studies have indicated that vegetated parabolic dunes can be activated into highly mobile barchan dunes and the catastrophic shift of eco-geomorphic systems is detrimental to land management and social-economic development; however, no detailed study has clarified the physical processes and eco-geomorphic interactions that control the stability of a parabolic dune and its resistance to unfavorable environmental changes. This study utilizes the Extended-DECAL (Discrete Eco-geomorphic Aeolian Landscapes) model, parameterized by field measurements of dune topography and vegetation characteristics combined with remote sensing, to explore how increases in drought stress, wind strength, and grazing stress may lead to the activation of stabilizing parabolic dunes into highly mobile barchans. The modeling results suggest that the mobility of an initial parabolic dune at the onset of a perturbation determines the capacity of a system to absorb environmental change, and a slight increase in vegetation cover of an initial parabolic dune can increase the activation threshold significantly. The characteristics of four eco-geomorphic interaction zones control the processes and resulting morphologies of the transformations. A higher deposition tolerance of vegetation increases the activation threshold of the dune transformation under both a negative climatic impact and an increased sand transport rate, whereas the erosion tolerance of vegetation influences the patterns of resulting barchans (a single barchan versus multiple barchans). The change in the characteristics of eco-geomorphic interaction zones may indirectly reflect the dune stability and predict an ongoing transformation, whilst the activation angle may be potentially used as a proxy of environmental stresses. In contrast to the natural environmental changes that tend to affect relatively weak and young plants, grazing stress can exert a broader impact on any plant indistinctively. A small increase in grazing stress just above the activation threshold can accelerate dune activation significantly. Copyright (c) 2017 John Wiley & Sons, Ltd.


英文关键词dune activation water stress wind strength overgrazing eco-geomorphic interaction
类型Article
语种英语
国家England
收录类别SCI-E
WOS记录号WOS:000429707500004
WOS关键词SAND-DUNES ; CONCEPTUAL-FRAMEWORK ; VEGETATION COVER ; DESERT ; MODEL ; DUNEFIELD ; DROUGHT ; CLIMATE
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
来源机构University of London
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/208626
作者单位1.Kings Coll London, Dept Geog, London, England;
2.Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England
推荐引用方式
GB/T 7714
Yan, Na,Baas, Andreas C. W.. Transformation of parabolic dunes into mobile barchans triggered by environmental change and anthropogenic disturbance[J]. University of London,2018,43(5):1001-1018.
APA Yan, Na,&Baas, Andreas C. W..(2018).Transformation of parabolic dunes into mobile barchans triggered by environmental change and anthropogenic disturbance.EARTH SURFACE PROCESSES AND LANDFORMS,43(5),1001-1018.
MLA Yan, Na,et al."Transformation of parabolic dunes into mobile barchans triggered by environmental change and anthropogenic disturbance".EARTH SURFACE PROCESSES AND LANDFORMS 43.5(2018):1001-1018.
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