期刊
JOURNAL OF ARID ENVIRONMENTS
卷 154, 期 -, 页码 24-33出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jaridenv.2018.03.011
关键词
Land degradation; Dune dynamics; Sediment; Aeolian transport; Hydraulic conductivity; Chihuahuan desert
资金
- U.S. National Science Foundation [EAR-1451489, EAR-1451518]
- U.S. Department of Transportation Southern Plains Transportation Center [SPTC14.1-39]
The formation of coppice dunes (nebkhas) has been attributed to both aeolian and hydrological processes, however, the interactions between these processes and vegetation dynamics are poorly understood. Additionally, a systematic study on the roles of dune geometry, morphology and hydrological processes in relation to sediment grain-size distribution in the coppice dune system is lacking. Here, we analyzed detailed grain-size distribution and saturated hydraulic conductivity for sediments collected from a series of coppice dunes with different morphological features and phases of development in a degraded shrubland in the southwestern US. Our results show that fine-grained dune sediments are associated with the wind-driven accumulation of very fine sand and fine sand (50-250 mu m), irrespective of the height of the dunes. Patterns of grain-size distribution are strongly related to the relative positions along the dune-interdune system and the alignment with the dominant wind direction. Thus, the current notion that dune sediments contain more sand and less silt than interdune soils is over-simplistic. The fact that the grain-size distribution and the saturated hydraulic conductivity are heterogeneous for the dune-interdune system with different morphological features suggests that the relative contributions of aeolian and hydrological processes are distinct in the evolution of coppice dunes.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据