Arid
DOI10.1016/j.aeolia.2017.02.003
Complexity confers stability: Climate variability, vegetation response and sand transport on longitudinal sand dunes in Australia’s deserts
Hesse, Paul P.1; Telfer, Matt W.2; Farebrother, Will1
通讯作者Hesse, Paul P.
来源期刊AEOLIAN RESEARCH
ISSN1875-9637
EISSN2212-1684
出版年2017
卷号25页码:45-61
英文摘要

The relationship between antecedent precipitation, vegetation cover and sand movement on sand dunes in the Simpson and Strzelecki Deserts was investigated by repeated (up to four) surveys of dune crest plots (approximate to 25 x 25 m) over a drought cycle (2002-2012) in both winter (low wind) and spring (high wind). Vegetation varied dramatically between surveys on vegetated and active dune crests. Indices of sand movement had significant correlations with vegetation cover: the depth of loose sand has a strong inverse relationship with crust (cyanobacterial and/or physical) while the area covered by ripples has a strong inverse relationship with the areal cover of vascular plants. However, the relationship between antecedent rainfall and vegetation cover was found to be complex. We tentatively identify two thresholds; (1) >10 mm of rainfall in the preceding 90 days leads to rapid and near total cover of crust and/or small plants <50 cm tall, and (2) >400 mm of rainfall in the preceding three years leads to higher cover of persistent and longer-lived plants >50 cm tall. These thresholds were used to predict days of low vegetation cover on dune crests. The combination of seasonality of predicted bare-crest days, potential sand drift and resultant sand drift direction explains observed patterns of sand drift on these dunes. The complex vegetation and highly variable rainfall regime confer meta-stability on the dunes through the range of responses to different intervals of antecedent rainfall and non-linear growth responses. This suggests that the geomorphic response of dunes to climate variation is complex and non-linear. (C) 2017 Elsevier B.V. All rights reserved.


英文关键词Simpson Desert Strzelecki Desert Climate change Aeolian
类型Article
语种英语
国家Australia ; England
收录类别SCI-E
WOS记录号WOS:000402214000005
WOS关键词LINEAR DUNES ; SPARSE VEGETATION ; ARID AUSTRALIA ; RAINFALL ; KALAHARI ; COVER ; MOBILITY ; DROUGHT ; RESILIENCE ; INSIGHTS
WOS类目Geography, Physical
WOS研究方向Physical Geography
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/197052
作者单位1.Macquarie Univ, Dept Environm Sci, Sydney, NSW 2109, Australia;
2.Univ Plymouth, Sch Geog Earth & Environm Sci, Plymouth PL4 8AA, Devon, England
推荐引用方式
GB/T 7714
Hesse, Paul P.,Telfer, Matt W.,Farebrother, Will. Complexity confers stability: Climate variability, vegetation response and sand transport on longitudinal sand dunes in Australia’s deserts[J],2017,25:45-61.
APA Hesse, Paul P.,Telfer, Matt W.,&Farebrother, Will.(2017).Complexity confers stability: Climate variability, vegetation response and sand transport on longitudinal sand dunes in Australia’s deserts.AEOLIAN RESEARCH,25,45-61.
MLA Hesse, Paul P.,et al."Complexity confers stability: Climate variability, vegetation response and sand transport on longitudinal sand dunes in Australia’s deserts".AEOLIAN RESEARCH 25(2017):45-61.
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