排序方法在土壤粒径分布研究中的应用——以策勒河流域为例

基于土壤结构的自相似性,分形理论目前被广泛用于土壤粒径分布(particle size distribution,简称PSD)研究中1],即以相对较多的土壤粒级数据,利用单重或多重分形技术获取参数(分形维)形式揭示PSD特征。量化得出的分维值,能较全面反映土壤PSD特征及其之间的差异性,但会受限于PSD差

ORDINATION AS A TOOL APPLIED IN THE STUDY OF SOIL PARTICLE-SIZE DISTRIBUTION---- A CASE STUDY FROM CELE RIVER BASIN

In this paper, the Cele River Basin at the North Slope of the Middle Kunlun Mountains was selected as study area and soil samples were collected from the nature vegetation region and Cele oasis farmland respectively. Soil particle-size distributions obtained by laser diffractometry were used as source data matrix, CCA and other ordination methods were applied to characterize soil particle-size distribution (PSD) and the relationships between PSDs and environmental factors (or affecting factors) and to discuss the ordination methods can be used in the study of PSD. Moreover, single fractal dimensions were calculated to support the interpretation of the ordination results. The results indicate that a differentiation of 16 particle fractions can sufficiently characterize the PSDs in ordination; the results of fractal dimensions analysis were rather similar to ordination results, but the ordination methods can yielded more detailed infromation about PSDs and further analyse the relationships between PSDs and environmental factors (or affecting factors) and give birth to quantitative results. Our study shows that ordination methods can be profitably used in research into PSDs and, combined with fractal measures, can provide comprehensive information about PSDs.