民勤荒漠绿洲过渡带白刺灌丛沙堆演化阶段及其空间格局

摘要/Abstract

摘要： 通过野外调查，分析了民勤荒漠绿洲过渡带不同地下水位埋深的3个白刺灌丛沙堆样方内灌丛沙堆水平投影面积与高度的关系、灌丛沙堆的空间分布及空间自相关关系，确定各个样方白刺灌丛沙堆的演化阶段，并分析了地下水位、沙源及植被生长对灌丛沙堆发展的影响。结果表明,白刺灌丛发育阶段灌丛沙堆的水平投影面积和高度之间为线性关系；稳定阶段白刺灌丛沙堆高度与水平投影面积为幂函数关系；退化阶段白刺灌丛沙堆高度和水平投影面积为二次函数关系。不同演化阶段白刺灌丛沙堆的空间自相关尺度为5 m，且3个样方之间自相关尺度没有显著差异。

关键词: 灌丛沙堆, 荒漠绿洲过渡带, 空间自相关

Abstract: Relationships of nebkhas horizontal projection area with nebkhas height and nebkha spatial distribution, and the spatial autocorrelationship were investigated in the Minqin desert-oasis ectone. The results were applied to categorize the developing phases of nebkhas. Effects of underground water table, distance to sand source, and plant growth on nebhas evolution were also investigated. Relationship between nebkhas horizontal projection area and height in the initial phase, developing phase, and degradation phase of nebkhas evolution demonstrate linear, power, and quadratic function relationshps, respectively. The spatial autocorrelation scale of nebkhas in the three phases is 5 m, and no significant difference among autocorrealtion scales of the three evolution phases is observed.

Key words: nebkhas, desert-oasis ectone, spatial autocorrelation

中图分类号:

P931.3

彭飞, 王涛, 刘立超, 黄翠华. 民勤荒漠绿洲过渡带白刺灌丛沙堆演化阶段及其空间格局[J]. 中国沙漠, 2012, 32(3): 593-599.

PENG Fei, WANG Tao, LIU Li-chao, HUANG Cui-hua. Evolution Phases and Spatial Pattern of Nebkhas in Minqin Deset-oasis Ectone[J]. JOURNAL OF DESERT RESEARCH, 2012, 32(3): 593-599.

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