摘要
对巴丹吉林沙漠高大沙山形态特征和环境因素的研究表明:高大沙山形成发育受沙源、风况、基底和植被等因素的影响,尤其受环境演变的影响较大。受西风环流的控制,沙山下伏地形的起伏不仅能够改变近地表风的运行形式,而且是风沙流运行的障碍。气候湿润期(间冰期)沙丘主要通过钙胶结层固定沙丘表面,并增大沙山基底;气候干冷期(冰期)在钙胶结层又发育次一级的沙丘。经过钙胶结固定-加积-再钙胶结固定循环的演化模式,最终发育成高大的复合型沙山。
Studies on the distributive features of megadune and effect of environmental factors in the Badain Jaran Desert showed that megadune formation and development were affected by sand supply, wind regimes, dune bases and vegetation etc, particularly by environmental evolution. The development of sand mountains was controlled by Westerlies, the underlying landform of megadunes not only caused the wavy movement of near-surface air stream but also became the barrier to blown sand movement. During the humid period (interglaicial period) sand dune surface was stabilized by calcareous cement layer, thus the dune bases were enlarged. During the arid and cold period (glacial period), secondary sand dunes developed on calcareous cement layers to form complex sand dunes, finally through the dune evolution cycles of calcareous stabilization-dune accretion-calcareous stabilization, mega sand mountains formed.
出处
《中国沙漠》
CSCD
北大核心
2005年第2期281-286,共6页
Journal of Desert Research
基金
国家重点基础研究发展规划项目(G2000048702
G2000048705)
自然科学基金(49501014)共同资助
