干旱区生态环境知识资源中心(Arid): 白刺灌丛沙堆形态与沉积特征

Arid

	白刺灌丛沙堆形态与沉积特征
其他题名	Nitaria Nebkhas： Morphology and sediments
	张萍; 哈斯; 岳兴玲; 庄燕美
ISSN	1000-6060
出版年	2008
卷号	31 期号:6 页码:926-932
中文摘要	白刺灌丛沙堆在我国西北干旱区分布广泛，但对其的研究程度较低。选择沙漠、戈壁和荒漠草地三种生境下发育的白刺灌丛沙堆，通过典型样方（100m*100m）调查和采样分析，探讨了沙堆形态、沉积物特征及其控制因素。在三个样区，沙堆总底面积和总体积从小到大依次为戈壁、沙漠、荒漠草地，沙堆密度从小到大的顺序为荒漠草地、沙漠、戈壁，表明植物生长状况和沙源是控制沙堆单体规模的主要因素。沙堆形态参数之间的相关分析结果显示，在三种生境下沙堆水平尺度与高度之间存在良好的二次多项式相关，且目前的沙堆尚处在垂向增长阶段。灌丛沙堆沉积物粒度组成以细砂为主，其粘土、粉沙和粗砂含量均少于丘间地，表明灌丛沙堆沉积物属短距离风力搬运、分选产物。沙堆表层沉积物平均粒径由迎风坡脚至背风坡脚趋于变细，由沙堆顶部垂直向下至底部趋于变粗但变化不明显。
英文摘要	Nitraria tangutorum Nebkhas widely distributed in arid region of Northwest China, but it is not widespread concerned. Using typical quadrat sampling and analyzing sediment, the morphological and depositional characteristics of Nitraria tangutorum Nebkhas and control factors in three habitats of Gobi, desert and desert grassland have been discussed in this paper. In same sample area （ 100 m * 100 m）, the sums of basal area and volume of all Nebkhas from small to large are of desert Gobi, desert and grassland habitats, while the ranking of distribution densities of Nebkhas in three habitats is just reverse, which demonstrates plant growth and the source of sediment are the major factors of determining the scale of single Nebkhas. The correlation coefficient among morphology parameters of Nebkhas in three habitats is high and the comparison expression between horizontal scale （ average of both length and width） and height of Nebkhas is quadratic polynomial. The quadratic polynomial is adopted to calculate the maximum height of Nebkhas in desert grassland, Gobi and desert, which are 2.46 m, 2.64 m and 0.84 m and corresponding horizontal scale are 26.79 m, 17.02 m and 9.28 m. The equation of silhouette area and volume of Nebkhas in sandy desert is power function and power exponent exceeds 1. In Gobi there is a strong relativity between plant population of shrub and morphology parameters, and in desert plant height is highly correlated with morphology parameters. In desert grassland sediments of Nebkhas are mainly composed of fine sands and the con- tents of clay, silty sands and coarse sands at Nebkhas are all less than that at the interdune, which means the sediments are sorted and carried by wind from neighborhood region. The mean grain size of surface sediment decrease from windward side to leeward side, which reflect the variant process of aeolian sand along wind. The mean grain sizes of sediments from top to base of Nebkhas tend to become coarser but not show strict regularity.
中文关键词	白刺 ; 灌丛沙堆 ; 形态 ; 沉积物
英文关键词	Ni- traria tangutorum Nebkhas morphology sediments Key Words： Nitaria tangutorum Nebkhas morphology sediments
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:3453404
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/222298
作者单位	北京师范大学资源学院防沙治沙教育部工程研究中心, 北京 100875, 中国
推荐引用方式 GB/T 7714	张萍,哈斯,岳兴玲,等. 白刺灌丛沙堆形态与沉积特征[J]. 北京师范大学,2008,31(6):926-932.
APA	张萍,哈斯,岳兴玲,&庄燕美.(2008).白刺灌丛沙堆形态与沉积特征.,31(6),926-932.
MLA	张萍,et al."白刺灌丛沙堆形态与沉积特征".31.6(2008):926-932.