GAO Chen-jing,LIU Qian,WANG Yan-xin,et al.Grain-size Characteristics of Sand Materials in Tamarix Cone Sedimentary Veins and Wind Sandy Environment Change in the Southern Region of Taklimakan Desert[J].Research of Soil and Water Conservation,2014,21(03):41-46.
塔克拉玛干沙漠南缘红柳沙包沙物质粒度特征与风沙环境变化
- Title:
- Grain-size Characteristics of Sand Materials in Tamarix Cone Sedimentary Veins and Wind Sandy Environment Change in the Southern Region of Taklimakan Desert
- 分类号:
- P467
- 摘要:
- 清晰的红柳沙包沉积纹层，不仅可以计数其年代，同时对还原区域历史气候环境有重要的指示意义。选取塔克拉玛干沙漠南缘地区三个采样点红柳沙包沉积纹层沙物质粒度参数、距平值和萨胡判别指数等指标，结合SPSS 17.0，Sigma Plot和Excel 2007等软件进行计算分析，目的在于还原该地区百年来的风沙环境变化情况。分析结果表明，塔克拉玛干沙漠南缘的红柳沙包沉积纹层沙物质以细沙占绝对优势，沙物质的粒度参数、粒级分布、粒度概率累计特征等都具有较强的相关性。从粒度数据中还可分析得出，B采样点风沙搬运动力最强，沉积物质以跃移和蠕移为主，说明B采样点的沉积环境更加稳定。C采样点的沉积物质则以悬移为主。通过采样点位置关系判断该地区红柳沙包的沙源主要是风成沙。沙物质粒度变化序列表明，近二百余年来该地区的气候从干旱逐渐转向湿润。塔克拉玛干沙漠南缘地区风沙环境变化阶段包括：1801—1872年，风沙作用较弱；1872—1902年，风沙作用明显变强；1903—1984年，风沙作用强度一般；1985—2010年，风沙作用明显回落。
- Abstract:
- The clear sedimentary veins of Tamarix Cone, can not only date the age, but also has important instruction significance to restore regional historical climate environment. This paper selects three sample points’ grain size parameters, sand material anomaly values and Sahu discriminant function which are in Tamarix Cone sand materials in the south margin of Taklimakan Desert. We combined with the software of calculation and analysis such as SPSS 17.0, Sigma Plot and Excel 2007, aimed to restore the region hundreds years of wind sandy environment changes. The analysis results of sand material grain size characteristics we got are as followings. The sand transport power of sample point B is the strongest, and the sedimentary materials are dominated by saltating and slow-moving, which means that the sedimentary environment of the sample point B is more stable. On the other hand, sample point C of deposition is given priority to with suspended matter. Through the sample points location relations and determination, the Tamarix Cone of this region mainly consists of eolian sand. The sand material granularity sequences show that the region climate gradually from drought to wet in two hundred of years. The change phase of wind sandy environment includes that the weaker wind-sandy action was from 1801 to 1872; the significantly stronger action was from 1872 to 1902; the normal strength was from 1903 to 1984; the significant decline of wind-sandy action was from 1985 to 2010.
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备注/Memo
收稿日期:2013-09-02;改回日期:2013-10-06。
基金项目:国家自然科学基金项目（41071133）；河北省高校重点学科建设项目
作者简介:高辰晶(1988-),女,河北滦县人,硕士研究生,从事区域生态与环境变化研究。E-mail:dorakao@live.cn
通讯作者:赵元杰(1965-),男,河北新乐人,教授,博士生导师,研究方向为区域生态与环境变化。E-mail:ecoenvir@163.com