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| 南昌市厚田沙地蔓荆灌丛沙堆的形态与沉积特征 | |
| 引用本文： | 李向洁,李志文,杜建会,张慧娟,詹江振,杜兰,孙丽,侯楚.南昌市厚田沙地蔓荆灌丛沙堆的形态与沉积特征[J].地理科学,2021,41(11):2042-2051. |
| 作者姓名： | 李向洁 李志文 杜建会 张慧娟 詹江振 杜兰 孙丽 侯楚 |
| 作者单位： | 1.东华理工大学地球科学学院，江西 南昌 330013 2.佛山科学技术学院环境与化学工程学院，广东 佛山 528225 3.中山大学地理科学与规划学院， 广东 广州 510275 |
| 基金项目： | 国家自然科学基金项目(41201006);国家自然科学基金项目(41571007);江西省数字国土重点实验室开放基金项目(DLLJ201913);江西省研究生创新基金项目(YC2020-S483) |
| 摘 要： | 为探究亚热带湿润地区河湖周边发育的灌丛沙堆形态与沉积特征，以南昌市厚田沙地为研究区，对其优势种蔓荆（Vitex trifolia）所形成的灌丛沙堆开展野外调查，通过对不同部位的沉积物进行采样与分析，研究沙堆形态、沉积特征及其与植被特性之间的关系。结果表明：蔓荆灌丛沙堆形态大多为盾形，水平尺度大，高度矮，坡度缓。沙堆沉积物以中沙为主，分选性较差，呈正偏和窄峰态分布，沙源来自附近平沙地和丘间地，为近源沉积。平均粒径从迎风坡底部至背风坡底部呈现为先变细后变粗的趋势，体现了灌丛沙堆的防风滞沙功能和对沙粒的重新分选作用。灌丛与沙堆的各形态参数（灌丛高度除外）均存在高度的正相关性（P＜0.01），说明各形态参数在沙堆发育过程中得以协调发展。受植被类型和区域环境的影响，与干旱-半干旱地区直立生长且分支少的灌丛形成的椭球形或圆锥形沙堆形态不同，蔓荆匍匐生长且高度较矮的形态常形成低矮且范围较大的灌丛沙堆。亚热带湿润地区风力资源不丰富及厚田沙地沙源不足使沉积物主要来源于附近平沙地与丘间地，但不同坡位沉积规律与干旱-半干旱地区相同。 |
| 关 键 词： | 厚田沙地 蔓荆 灌丛沙堆 沉积物 |
| 收稿时间： | 2021-03-13 |
| 修稿时间： | 2021-07-20 |
Morphology and Sedimentary Characteristics of Vitex Trifolia Nebkhas in the Houtian Sandy Land of Nanchang City |
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| Li Xiangjie,Li Zhiwen,Du Jianhui,Zhang Huijuan,Zhan Jiangzhen,Du Lan,Sun Li,Hou Chu.Morphology and Sedimentary Characteristics of Vitex Trifolia Nebkhas in the Houtian Sandy Land of Nanchang City[J].Scientia Geographica Sinica,2021,41(11):2042-2051. | |
| Authors: | Li Xiangjie Li Zhiwen Du Jianhui Zhang Huijuan Zhan Jiangzhen Du Lan Sun Li Hou Chu |
| Institution: | 1. School of Earth Science, East China University of Technology, Nanchang 330013, Jiangxi, China 2. School of Environmental and Chemical Engineering, Foshan University, Foshan 528225, Guangdong, China 3. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, Guangdong, China |
| Abstract: | In order to explore the morphology and sedimentary characteristics of the nebkhas developed around the rivers and lakes in the subtropical humid areas, the Houtian sandy land in Nanchang was used as the research area to conduct field investigations on the nebkhas formed by the dominant species Vitex trifolia, sampling and analysis of sediments to study the morphology and sedimentary characteristics of nebkhas and their relationship with vegetation characteristics. The results show that: The Vitex trifolia nebkhas in the Houtian sandy land are mostly shield-shaped, with large horizontal scale, low height, and gentle slope. The sediments of the nebkhas are mainly medium sand, with poor sorting, a coarse skewness and narrow kurtosis distribution, sediments all originate from nearby flat sandy land and inter-dune land, which are near-source deposits. The average particle size is a tendency of finer first and then coarser from the bottom of the windward slope to the leeward slope, reflecting the wind-breaking and sand-fixing function and the re-sorting of sand particles of the nebkhas. All morphological parameters of shrubs and nebkhas have high correlations (except for the height of the shrubs) (P<0.01), indicating that the morphological parameters develop in a coordinated manner during the development of nebkhas. Due to the influence of vegetation types and regional environment, different from the ellipsoid or cone-shaped nebkhas formed by upright shrubs with few branches in arid-semi-arid areas, theVitex trifolia with creeping and low height often forms low and wide range nebkhas. The subtropical humid areas are not rich in wind resources and the sand sources in Houtian sandy land are insufficient, so the sediments are all from nearby flat sandy land and inter-dune land, but the deposition law of different slope positions is similar to the arid-semi-arid areas. |
| Keywords: | Houtian sandy land Vitex trifolia nebkhas sediments |
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