地理研究 ›› 2011, Vol. 30 ›› Issue (7): 1178-1186.doi: 10.11821/yj2011070003

• 地表过程研究 • 上一篇    下一篇

古尔班通古特沙漠南部风沙土性状在沙垄尺度上的空间变异

钱亦兵1, 吴兆宁2, 王忠臣1,3, 蒋超1,3, 杨海峰1,3   

  1. 1. 中国科学院新疆生态与地理研究所,乌鲁木齐 830011;
    2. 新疆大学地质与勘查工程学院,乌鲁木齐 830046;
    3. 中国科学院研究生院,北京 100039
  • 收稿日期:2010-09-29 修回日期:2011-01-18 出版日期:2011-07-20 发布日期:2011-07-20
  • 作者简介:钱亦兵(1956-), 女, 江苏人, 硕士, 研究员, 主要从事荒漠生态环境研究。 E-mail: dt6@ms.xjb.ac.cn
  • 基金资助:

    国家重点基础研究发展计划(973)项目(2009CB825105);新疆阜康市林业局项目

Spatial variation of physical and chemical properties for eolian sand soil at longitudinal dune scale in southern Gurbantunggut Desert

QIAN Yi-bing1, WU Zhao-ning2, WANG Zhong-chen1,3, JIANG Chao1,3, YANG Hai-feng1,3   

  1. 1. Xinjiang Institute of Ecology and Geography, CAS, Urumqi 830011, China;
    2. College of Geology and Exploration Engineering, Xinjiang University, Urumqi 830046, China;
    3. Graduate University of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2010-09-29 Revised:2011-01-18 Online:2011-07-20 Published:2011-07-20

摘要: 在新疆古尔班通古特沙漠南部纵向沙垄上,按5 m×5 m的网格采集浅层风沙土组合样品184件,调查植被样方100个,并测试了风沙土质地、pH、盐分、含水量、全N含量和有机质含量等理化性状。研究发现:受沙垄地貌和植被格局的影响,风沙土性状具有中等到强烈的空间相关性,空间依赖范围(变程)介于21.3~74.8m,大致对应着单一沙垄宽度或垄间地-沙垄-垄间地的地貌单元宽度。利用地统计分析求得不同取样尺度上的分维D。风沙土质地(粒径、平均粒径、分选系数)和盐分(电导率)及养分(有机质和全N含量)在0~40m的取样间隔下,D较大,空间变异程度基本处于中高水平;在90~150m的取样间隔下,D骤减,空间异质性大大增强。风沙土含水量的空间变异强度曲线为几段式形态,并且分维依次递减。

关键词: 古尔班通古特沙漠, 沙垄尺度, 风沙土性状, 空间变异, 分维

Abstract: The spatial variation of physical and chemical properties for eolian sand soil at longitudinal dune scale in southern Gurbantunggut Desert was studied by means of geostatistical methods. In the study, 184 samples of eolian sand soil from the quadrats of 5 m×5 m were systemically collected over the dune crests, slopes and interdune areas of two longitudinal dunes in southern Gurbantunggut Desert and 100 quadrats of vegetation were measured. The physical and chemical properties of eolian sand soil, including soil grain-size parameters, pH, salts, water content, total N and organic matter were determined. The results show that under the impact of longitudinal dune landform characteristics, including elevation, slope aspect, slope angle and partial micro-terrain and vegetation pattern, the physical and chemical properties of eolian sand soil have the variance of weak to medium extent and the spatial autocorrelation of moderate to strong extent. The values of spatial correlated ranges are 21.3-74.8 m, which approximately correspond to a width of single longitudinal dune or a width of landform unit from interdune area to dune to interdune. Because these soil properties have a nest structure of different level systems, the fractal dimensions, D values at different scales were gained. The D values of soil grain-size parameters (φ1, Mz,σ), soil salts (EC) and soil nutrients (organic matter and total N) in a sampling interval of 0-40 m are larger, and the spatial variation is basically medium to high level. Under a sampling interval of 90-150 m, the D values were sharply reduced and the spatial variations were greatly increased. The curve of variation strength for soil water contents was in several segments and the D values were gradually decreased in turn. The mechanism of the close relationship of the spatial variations between soil total N and organic matter contents shows that the spatial variations of the soil physical and chemical properties, which are expressed by the fractal dimensions and not regularly preprocessed, well accord with the field facts.

Key words: Gurbantunggut Desert, longitudinal dune scale, physical-chemical properties of eolian sand soil, spatial variation, fractal dimension