干旱区生态环境知识资源中心(Arid): 沙冬青灌丛地的土壤颗粒大小分形维数空间变异性分析

Arid

	沙冬青灌丛地的土壤颗粒大小分形维数空间变异性分析
其他题名	Spatial heterogeneity analysis of fractal dimension of soil particle for Ammopiptanhus mongolicus shrub
	贾晓红; 李新荣; 张景光; 张志山; 王新平; 谭会娟
ISSN	1000-0933
出版年	2006
卷号	26 期号:9 页码:2827-2833
中文摘要	通过土壤颗粒大小分形维数对土壤质地定量分析表明，土壤颗粒大小分形维数与沙粒含量（>0.1mm）呈显著的线性负相关，与粘粉粒含量（<0.05mm）呈显著的线性正相关关系（p<0.0001），沙粒和粘粉粒含量每增加1%，分形维数则降低或升高0.022个单位，沙粒增加导致分形维数的降低和粘粉粒增加导致分形维数升高幅度一致，所以土壤颗粒分形维数可以作为评价土地沙质荒漠化程度的定量指标之一。荒漠地带以沙冬青为优势种的沙生植被地段，地表土壤颗粒粗粒化和50～70cm土层土壤颗粒的细粒化，为该区有限降水的深层渗漏提供了基质，为沙冬青的存活提供了保障，一定程度上支持了一些专家提出的概念模型，验证了粗质土壤质地支持以灌木为主的群落的假说。但从空间变异性分析来看，荒漠区沙冬青群落因地表物质的吹蚀和堆积过程频繁以及灌丛沙堆发育程度引起的分枝形态差异，导致了土壤颗粒含量空间变异尺度并未集中在冠幅范围，并不支持灌丛在沙漠生态系统对降尘等细粒物质拦截所形成的沃岛"作用。正是因为以沙冬青为优势种的沙生植被地段土壤颗粒组成的高度空间异质性，并且空间变异的范围并不局限于灌木冠幅范围和冠幅间的裸地，没有为其它植物种的入侵创造土壤基质条件，才使得沙冬青群落在该区稳定存在，为荒漠残遗植物种沙冬青的迁地保护和干旱沙区植被恢复过程中合理地利用土壤资源，以避免营林失败等问题提供了理论依据.
英文摘要	Based on quantitative analysis of soil texture using soil fractal dimension of particle size distribution, the distribution of soil fractal dimension is a significant negative correlation with sand content（>0.1mm）, and positive correlation with proportion content of silt and clay（<0.05mm）（p<0.0001）. Increasing in sand content can result in decreasing of fractal dimension, and increasing in silt and clay can result in increasing of fractal dimension. However, the variation tendencies in soil fractal dimensions are different because of sand content or silt and clay content changes, while there is a same range on variation of fractal dimension. The fractal dimensions will be decreased or increased by 0.022 when increasing in 1% of sand content or silt and clay. So, soil fractal dimension can be considered to be one of quantitative indices for evaluating desertification. In comparison with soil layer of depth 50～70cm, the texture of surface soil (0～5cm) appears coarser. This characteristic of soil texture distribution in soil profile benefits to rainfall infiltration in deep soil and ensures available moisture for deep-rooted Ammopiptanhus mongolicus and accompanying shrub species. The soil texture distribution in profile partly supported conceptual model by some researchers described, and tested the hypothesis that the coarse-texture soil supports the dominance of shrub species in comparison with herbaceous species. However, spatial heterogeneity analyzed showed that spatial heterogeneous scale of soil particle content beyond the confine of canopy and inter-space of shrubs due to strong wind erosion occurred on soil surface, and the morphological differences in ramification and height of plants result from developing degree of sand mound by shrubs in the psammo-vegetation. Furthermore, our results do not supported the hypothesis on fertile island of shrub since shrub roles for fertile island formation were weakened by frequent wind erosion in desert ecosystem. This soil habitat of Ammopiptanhus mongolicus community prevent other both woody species and herbaceous from invasion and plays a significant role in maintain community stability. These results can be contributed to knowledge to understand the conversation mechanism of unique Tethys sea relic floristic species.
中文关键词	沙冬青 ; 沙生植被 ; 土壤颗粒大小分形维数 ; 空间变异
英文关键词	Ammopiptanhus mongolicus psammo-vegetation fractal dimension of soil particle spatial heterogeneity
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ECOLOGY
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:2442964
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/220044
作者单位	中国科学院寒区旱区环境与工程研究所沙坡头沙漠研究试验站, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	贾晓红,李新荣,张景光,等. 沙冬青灌丛地的土壤颗粒大小分形维数空间变异性分析[J]. 中国科学院西北生态环境资源研究院,2006,26(9):2827-2833.
APA	贾晓红,李新荣,张景光,张志山,王新平,&谭会娟.(2006).沙冬青灌丛地的土壤颗粒大小分形维数空间变异性分析.,26(9),2827-2833.
MLA	贾晓红,et al."沙冬青灌丛地的土壤颗粒大小分形维数空间变异性分析".26.9(2006):2827-2833.