Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 1875-9637 |
EISSN | 2212-1684 |
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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