民勤荒漠绿洲过渡带灌丛沙堆形态特征及分布格局

doi:10.7522/j.issn.1000-694X.2015.00078

摘要/Abstract

摘要：

以民勤荒漠绿洲过渡带为研究区,通过样方调查,研究了荒漠区、荒漠绿洲过渡区到绿洲内不同梯度生境中灌丛沙堆的形态特征及分布格局。结果表明:(1)3种生境中灌丛沙堆的形态呈极显著性差异(p<0.01);绿洲区灌丛沙堆的平均高度、底面积、纵横断面积和体积均最大,其次为荒漠区,过渡区最小。(2)过渡带3种生境灌丛沙堆的长、短轴之间均呈二次函数关系,但相关程度不同,过渡区相关性最高,相关系数达0.78;绿洲区相关性最低,相关系数为0.57;高度与底面积、体积与高度间均呈幂函数关系,相关系数均在0.59以上;(3)过渡区灌丛沙堆分布密度较大,呈聚集分布,而荒漠区及绿洲区沙堆分布密度较小,均呈随机分布。

关键词: 民勤, 荒漠绿洲过渡带, 灌丛沙堆, 形态特征

Abstract:

The desert-oasis ecotone in Minqin,Gansu, China was selected as the studied area, and the morphological characteristics and distribution patterns of nebklas in three habitats, just desert, desert-oasis ecotone and oasis were researched by the quadrat survey method. The results are as follows. (1) There were significant differences of the nebklas' morphological characteristics among the different habitats (p<0.01). The average height, bottom area, vertical and cross section and volume of the nebkhas were all the largest in the oasis, followed by the desert, and the last was the desert-oasis ecotone. (2)There was significant quadratic function relationship between the long axis and short axis of nebklas, but with different degree of correlation, the highest was in the desert-oasis ecotone with correlation coefficient value 0.78, while the lowest was in the oasis with correlation coefficient value 0.57. Typical power function relationships were existed between the height and bottom area, and also between the volume and height of the nebklas, the correlation coefficient values were all more than 0.59. (3) The nebklas in the desert-oasis ecotone was presented clustered distribution with much higher distribution density, while in the oasis and the desert area nebklas showed random distribution with lower distribution density.

Key words: Minqin, desert-oasis ecotone, nebkhas, morphological feature

中图分类号:

P931.9

张进虎, 唐进年, 李得禄, 魏林源, 满多清, 柴成武. 民勤荒漠绿洲过渡带灌丛沙堆形态特征及分布格局[J]. 中国沙漠, 2015, 35(5): 1141-1149.

Zhang Jinhu, Tang Jinnian, Li Delu, Wei Linyuan, Man Duoqing, Chai Chengwu. Morphological Characteristics and Distribution Patterns of Nebkhas in Desert-oasis Ecotone[J]. JOURNAL OF DESERT RESEARCH, 2015, 35(5): 1141-1149.

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