| 生物基可降解聚乳酸(PLA)沙障对沙丘表层沉积物粒度特征的影响 |
| |
| 引用本文： | 丁延龙,高永,汪季,孙晓瑞,党晓宏,韩彦隆,李鹏.生物基可降解聚乳酸(PLA)沙障对沙丘表层沉积物粒度特征的影响[J].中国沙漠,2018,38(2):262-269. |
| |
| 作者姓名： | 丁延龙 高永 汪季 孙晓瑞 党晓宏 韩彦隆 李鹏 |
| |
| 作者单位： | 1. 内蒙古农业大学 沙漠治理学院, 内蒙古 呼和浩特 010018;2. 内蒙古农业大学 中央与地方共建风沙物理重点实验室, 内蒙古 呼和浩特 010018;3. 内蒙古杭锦荒漠生态系统国家定位观测研究站, 内蒙古 鄂尔多斯 017400 |
| |
| 基金项目： | 内蒙古自然科学基金重大专项（2014ZD03）；国家科技支撑计划项目（2015BAC06B01-03） |
| |
| 摘 要： | 以吉兰泰盐湖北部流沙区铺设8 a的不同规格聚乳酸（PLA）沙障内沉积物为研究对象，利用激光衍射技术分析了沙丘表层0~3 cm沉积物粒度组成，计算并分析平均粒径、标准偏差等粒度参数，探讨了影响障内沉积物相对粗细的关键组分，分析PLA沙障的防沙效益。结果表明：PLA沙障内沉积物以细沙、中沙、极细沙为主。中沙、极细沙、细沙是障内沉积物的关键组分。PLA沙障的阻滞作用使得中沙、粗沙含量百分比升高，细颗粒含量百分比降低，障内沙粒分选性逐渐变差，峰态偏离正态分布，向负偏方向发展，频率分布曲线分布范围变宽，累积频率曲线变缓，表层颗粒组成趋于粗化。1 m×1 m规格PLA沙障内均以积沙为主；沙丘迎风坡和背风坡的2 m×2 m、3 m×3 m沙障内均为积沙状态，丘顶则为风蚀状态。综合考虑沙障铺设成本和防护效果，得出研究区域内2 m×2 m规格PLA沙障整体防沙效益最佳。
|
| 关 键 词： | 粒度特征 沉积物 聚乳酸(PLA)沙障 吉兰泰盐湖 |
| 收稿时间： | 2016-08-08 |
| 修稿时间： | 2016-11-17 |
Effects of Biodegradable Poly Lactic Acid Sand Barriers on Surface Sediment Grain-size Characteristics at Sand Dunes |
| |
| Ding Yanlong,Gao Yong,Wang Ji,Sun Xiaorui,Dang Xiaohong,Han Yanlong,Li Peng.Effects of Biodegradable Poly Lactic Acid Sand Barriers on Surface Sediment Grain-size Characteristics at Sand Dunes[J].Journal of Desert Research,2018,38(2):262-269. |
| |
| Authors: | Ding Yanlong Gao Yong Wang Ji Sun Xiaorui Dang Xiaohong Han Yanlong Li Peng |
| |
| Institution: | 1. Desert Science and Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China;2. Wind Erosion Key Laboratory of Central and Local Government, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China;3. National Positioning Observation Research Station of Hangjin Desert Ecosystem, Ordos 017400, Inner Mongolia, China |
| |
| Abstract: | In this research, the surface layer(0-3 cm) of different specifications PLA(Poly Lactic Acid) sand barriers in the northern Jilantai Salt Lake was selected to analyse the grain-size characteristics. The sediment particle size distributions were identified by using laser diffraction technique. The grain-size characteristics parameters, such as average particle size, sorting, skewness and kurtosis were determined, then calculated and analysed sand-fixation benefits of sand barriers. The results indicated that the sediment particle size was mainly made up of fine sand, medium sand and very fine sand. The medium sand, very fine sand and fine sand were the key factors that affected the sediment particle thickness in the sand barriers. The PLA sand barrier increased the content of medium sand and coarse sand, decreased the content of fine particles, and the sorting became worse, the kurtosis deviated from normal distribution and turned negative partial. The frequency distribution curves became wider, while the cumulative frequency curve became slow. The sediment particle size distributions tended to be coarsen. The sand drift activities inside the 1m 1m specification PLA sand barriers on the entire sand dune was deposition. The sand drift activities in 2m 2m and 3m 3m sand barriers at windward and leeward slope performed as deposition as well, while the top of sand dune was erosion. Considering laying costs and protective effects, 2m 2m was the best specification of PLA sand barriers for the study area. |
| |
| Keywords: | grain-size characteristics sediment PLA sand barriers Jilantai Salt Lake |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国沙漠》浏览原始摘要信息 |
| 点击此处可从《中国沙漠》下载免费的PDF全文 |
|
