文献类型：期刊文献

中文题名：额济纳盆地戈壁沉积物粒度特征分析

英文题名：Grain size characteristics of gobi sediment in Ejina Basin

作者：董智[1] 王丽琴[1] 杨文斌[2] 李红丽[1] 李卫[2] 张志鹏[1] 丛日春[2]

第一作者：董智

机构：[1]山东农业大学林学院,山东省土壤侵蚀与生态修复重点实验室,泰山森林生态站,山东泰安271018;[2]中国林业科学研究院荒漠化研究所,北京100091

年份：2013

期号：1

起止页码：32-38

中文期刊名：中国水土保持科学

外文期刊名：Science of Soil and Water Conservation

收录：CSTPCD;;CSCD:【CSCD2013_2014】；

基金：中国林业科学研究院专项资金重大项目“中国黑戈壁区生态本底调查”(CAFYBB2011002);林业行业专项“中国沙漠分类与编目指标体系研究”(201004059);国家自然科学基金“沙柳沙障对流沙环境变异与天然植物定居的影响及机制”(30972420)

语种：中文

中文关键词：戈壁;沉积物;粒度组成;粒度参数;额济纳盆地

外文关键词：gobi; sediments; grain size composition; grain size parameters; Ejina Basin

分类号：P588.21;X141

摘要：通过野外实地调查取样与室内粒度测试,分析额济纳盆地戈壁地表及下层沉积物的粒度组成、平均粒径、分选系数、偏度、峰度等粒度参数特征。结果表明:1)除冲积-洪积扇上部外,戈壁表层沉积物粒度组成以石块为主,而下层粒度组成则以砂粒为主,颗粒平均粒径表层多数较粗,以石、砾为主,下层沉积物平均粒径较表层具明显的细化趋势,从低山残丘至洪积扇下部,平均粒径由粗变细;2)戈壁不同层次沉积物颗粒的分选性较差或差,仅在低山残丘与湖泊边岸浅滩分选属于中等;3)表层沉积物偏度以正偏、极正偏占主导,占总数的76.93%,而下层颗粒物的偏度以负偏、极负偏为主,占总体的84.62%;4)表层沉积物粒度频率曲线以尖窄、很尖窄为主,占69.23%,其次为中等,占15.38%,而下层则以宽平、很宽平和中等为主,三者共占76.93%;5)戈壁沉积物的粒度特征整体上表现为粒径较粗、分选较差、正偏态、峰态尖窄的特点,综合反映了颗粒的沉积环境、地貌特征、侵蚀与堆积方式。研究结果可为戈壁类型划分提供参考。
The surface and sublayer gobi sediment grain size composition, average grain size, sorting coefficient, skewness and kurtosis were analyzed by collecting sediment samples in field and testing grain size characteristics in laboratory. The results show that except for the top of alluvial-proluvial fan, the majority grain size of surface sediment was occupied by stone, but that of sublayer sediment was sand. In surface sediment, the mean grain diameter was relatively large composed by stone and gravel, but in the sublayer, the mean grain size had significantly thinner trend. Therefore, the average grain size changed smaller from low residual mountain to alluvial-proluvial fan edge. The grain sorting in different sediment layers was poor or poorer, but only was medium on low residual mountain and nearshore lake shallow. The grain skewness of surface sediment was positive or very positive, accounting for 76.93% of the total sampling,while the skewness of sublayer sediment was negative or very negative, accounted for 84.62% of the overall sampling. Kurtosis frequency curve of grain size in surface sediment was sharp or very sharp, accounting for 69.23% ,followed by medium, accounting for 15.38% ,while in sublayer sediment was flat, very flat or medium, accounting for 76.93%. In general, gobi sediments appeared the characteristics of coarse grain size, bad sorting, positive skewness and sharp curve features, which reflected the sedimentary environment, morphological characteristics, erosion and deposition pattern. The results could provide the reference for the gobi classification.