摘要
运用野外采样及室内分析的方法,研究策勒沙漠-绿洲过渡带近地表沙物质的粒度特征,可为防风治沙提供理论依据.结果表明:沿主风向,自流沙前沿至绿洲边缘,沙物质粒径逐渐细化,以极细砂为主,分选系数介于1.50~1.92,分选性中等.偏度介于-0.10~0.10之间,相对于平均值呈近对称分布.峰态数值介于0.95~1.06之间,属于中等峰态.地表输沙物质、灌丛沙堆表面沙物质各粒度参数间均呈现出较显著的线性相关性.流动沙丘表面沙物质的平均粒径与分选系数呈显著线性正相关,裸平沙地与大气降尘沙物质的偏度与峰态呈显著线性负相关,其余各参数特征间的线性相关性均较低.地表输沙物质、灌丛沙堆表面的黏粒、粉砂、砂的含量与各粒度参数呈现极显著相关性(p<0.01),而裸平沙地、大气降尘、流动沙丘表面沙物质黏粒、粉砂、砂的含量与部分粒度参数呈极显著相关性(p<0.01).植被覆盖度、高度、风力、地形及空间差异等是影响近地表沙物质粒度差异的主要因素.
By using the method of field sampling and indoor analysis,the study on grain size characteristics of near-surface sediment in Cele desert-oasis transitional zone can provide a theoretical basis for wind-resistant desertification.The results show that along the main wind direction,from the frontier of quicksand to the edge of oasis,the particle size of sand material is gradually refined,and the separation coefficients are mainly in 1.50—1.92. Sorting medium.The skewness is between the-0.10—0.10 and the mean is nearly symmetric.The peak state value is between 0.95—1.06 and belongs to the middle peak state.There is a significant linear correlation between the surface sediment and the grain size parameters of the shrub sand.The average particle size of sand material on the surface of floating dune presents a significant linear positive correlation with the separation coefficient,and the skewness of the sand matter in the naked sandy land is negatively correlated with the peak state,and the linear correlation between the other parameters is lower.The content of clay,silt and sand particles of sand transported materials near ground surface and on the surface of nebkhas is very significant correlated with the each parameters of grain size( p0.01),and the content of clay,silt and sand on the surfaces of bare-flat sandy land,shifting sand dunes and dustfall materials is very significant correlated with the some parameters of grain size( p〈0.01).Vegetation coverage,altitude,wind power topography and spatial difference are the main factors that affect the particle size difference of surface sediment.
作者
刘晓静
毛东雷
蔡富艳
雷加强
来风兵
薛杰
LIU Xiao-jing1 , MAO Dong-lei1,2,3, CAI Fu-yan4, LEI Jia-qiang2,3, LAI Feng-bing1 , XUE Jie2,3(1.The Key Laboratory Xinjiang Laboratory of Lake Environment and Resources in Arid Zone, College of Geography Science and Tourism, Xinjiang Normal University, Urumqi 830054, China ; 2.Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 3.Cele National Station of Observation and Research for Desert-Grassland Ecosystem in Xinjiang, Cele 848300, China; 4.College of Application Engineering, Urumqi Vocational University, Urumqi 830002, Chin)
出处
《云南大学学报(自然科学版)》
CAS
CSCD
北大核心
2018年第3期491-501,共11页
Journal of Yunnan University(Natural Sciences Edition)
基金
新疆维吾尔自治区高校科研计划项目(XJEDU2016I035)
新疆师范大学博士科研启动基金(XJNUBS1527)
国家自然科学基金(41601595,41661002)
关键词
沙漠-绿洲过渡带
沙尘
粒度
特征
策勒
desert- oasis ecotone
sand and dust
grain size
characteristics
Cele