乌兰布和沙漠不同下垫面冬季沙尘通量

doi:10.7522/j.issn.1000-694X.2015.00190

摘要/Abstract

摘要： 为揭示乌兰布和沙漠不同下垫面冬季沙尘通量的垂直分布，在野外实地监测的基础上对乌兰布和沙漠3种下垫面冬季输沙量进行测量分析。结果表明：近地表0～100 cm高度内冬季输沙量流动沙丘 > 梭梭固定沙丘 > 白刺半固定沙丘。各下垫面输沙量随高度呈下降趋势，流动沙丘、白刺半固定沙丘、梭梭固定沙丘符合幂函数分布，流动沙丘、梭梭固定沙丘输沙量集中于0～20 cm高度，白刺半固定沙丘集中于0～40 cm高度。风沙流幂函数通量系数a、b与粒径< 0.1 mm和粒径 >0.5 mm颗粒含量负相关，与粒径0.1～0.25 mm颗粒含量正相关，与粒径0.25～0.5 mm颗粒含量不相关。沙粒跃移高度在流动沙丘、白刺半固定沙丘和梭梭固定沙丘分别集中于0～3.59、0～4.33和0～2.36 cm；跃移高度与粒径<0.05 mm和0.1～0.5 mm颗粒含量正相关，尤其与粒径0.1～0.25 mm颗粒含量呈指数函数正相关，与粒径0.05～0.1 mm及>0.5 mm颗粒含量无明显相关性。乌兰布和沙漠流动沙丘在冬季仍具有较大的侵蚀状态，白刺半固定沙丘处于弱风蚀状态，梭梭固定沙丘处于堆积状态，造成地表积沙。在冬季，梭梭固定沙丘仍然发挥着防风固沙的能力，成为冬季固定风沙的重要防线。

关键词: 输沙量, 下垫面, 相关性, 风沙流系数

Abstract: In order to reveal the vertical distribution of dust over different underlying surfaces in the Ulan Buh Desert in winter, the sediment discharge of 3 kinds of underlying surfaces were analyzed based on the actual monitoring data in winter. The total sediment discharge of 0-100 cm height in winter was mobile dune > fixed dune > semi-fixed sand dune. The sediment discharge over 3 kinds of underlying surfaces all decreased with height and conformed to power function distribution. The sediment discharges over mobile dune, fixed dune were concentrated in 0-20 cm height and the sediment discharge over semi-fixed sand dune was mainly concentrated in 0-40 cm height. The coefficients a and b was negatively correlated with the concentration of < 0.1 mm particles and >0.5 mm particles, and was positively correlated with the concentration of 0.1-0.25 mm particles, and no correlation with the concentration of 0.25-0.5 mm particles. The saltation heights over mobile dune, fixed dune and semi-fixed sand dune were 3.59 cm, 2.36 cm and 4.33 cm, respectively. There was a positive correlation between the saltation height and the concentrations of <0.05 mm and 0.1-0.5 mm particles, especially there was an exponential function relationship with the concentrations of 0.1-0.25 mm particles, but there was no significant relationship with the concentrations of 0.05~0.1 mm and >0.5 mm particles. The mobile dune in the Ulan Buh Desert was still in serious erosion in winter, and semi-fixed sand dune was basically stable, and fixed dune was in the accumulation state. Fixed dune was still play a role in sand fixation in winter.

Key words: sediment, underlying surface, correlation, the coefficient of sand flow

中图分类号:

P931.3

陈新闯, 董智, 李锦荣, 李红丽, 郭建英, 贾淑友, 代豫杰. 乌兰布和沙漠不同下垫面冬季沙尘通量[J]. 中国沙漠, 2016, 36(6): 1527-1532.

Chen Xinchuang, Dong Zhi, Li Jinrong, Li Hongli, Guo Jianying, Jia shuyou, Dai Yujie. Winter Sand-dust Flux over Different Underlying Surfaces in the Ulan Buh Desert[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(6): 1527-1532.

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