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- Title
策勒绿洲-沙漠过渡带风成沉积物粒度的空间变化.
- Authors
林永崇; 徐立帅
- Abstract
In order to understand the environmental influence of oasis-desert ecotone to oasis ecological system, we comparatively analyzed the grain size characteristics of various aeolian sediments , including the sediments in oasis-desert ecotone, shelterbelt and the inside oasis and in Qira River valley. The results showed that the grain size characteristics (including grain-size distribution curve, grain size parameters, and content of different size classes) of sediments in the oasis-desert ecotone were consistent along the prevailing wind direction with a grain-size range of 0.3-200 (xm and modal size of 67 (m. All of the sediments were good sorting and mainly composed of suspension components and saltation components, but not denatured saltation and creeping components (>200 (m) . They were typically aeolian deposits being short-range transported. The grain sizes of sediments in oasis-desert ecotone were smaller than that in the material sources of Qira River valley and desert (0.3-800 (m), but very similar to those of the modern aeolian deposits in oasis-desert ecotone , shelterbelt and the inside oasis. The denatured saltation and creep components (>200 (m) were suppressed to transport into oasis-desert ecotone because of the high vegetation cover in oasisdesert ecotone. Therefore, like the shelterbelts, the oasis-desert ecotone could also block the invasion of desert. They safeguarded the oasis ecological environment together.
- Publication
Yingyong Shengtai Xuebao, 2017, Vol 28, Issue 4, p1337
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.201704.032