祁连山区主要下垫面土壤粒径分布特征
贺 燕1, 魏 霞1, 魏 宁2, 于文竹1, 崔 霞1, 赵恒策1

(1.兰州大学 资源环境学院, 兰州 730000; 2.西北农林科技大学 理学院, 陕西 杨凌 712100)

粒径分布; 单重分形; 多重分形; 土壤; 祁连山

Characteristics of Soil Particle Size Distribution of Main Land Surfaces in Qilian Mountains
HE Yan1, WEI Xia1, WEI Ning2, YU Wenzhu1, CUI Xia1, ZHAO Hengce1

(1.College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000,China; 2.College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China)

soil particle size distribution; single fractal model; multi-fractal model; soil; Qilian Mountains

备注

为揭示祁连山区土壤结构异质性和粒径分布(PSD)的非均匀性,阐明主要下垫面土壤性质差异及土地退化趋势。以祁连山区荒漠、草原、草甸和灌丛等下垫面土壤为研究对象,运用分形理论和相关分析研究了土壤颗粒的粗糙度和非均匀性,分析了下垫面、土壤质地对分形参数的影响。结果 表明:土壤单重分形维数(DV)分布范围为2.089～2.500,下垫面对DV、多重分形参数(容量维数D0,信息维数D1,关联维数D2,D1/D0)影响显著,荒漠土壤粗糙度显著(pV极显著正相关,与多重分形参数显著正相关(D0除外),且DV和多重分形参数分别受黏粒、细砂粒体积分数的主导作用。该研究通过对土壤颗粒微观结构详细分析,可为祁连山区不同下垫面土壤改良及实际生产提供理论基础,为生态环境治理提供科学依据。

In order to clarify the heterogeneity of soil particle size distribution(PSD)and reveal the soil property difference and land degradation trend of land surface in Qilian Mountains, four types of land use(desert, alpine steppe, alpine meadow, and shrub)in Qilian Mountains were selected as the research samples. The contents of soil particle sizes were measured using a laser particle analyzer, soil fractal model and correlation analysis were applied to study the coarseness and the heterogeneity of soil particle composition, and the effects of land-use and soil texture on fractal parameters were analyzed. The results show that the single fractal dimensions(DV)of the four land surfaces range from 2.089 to 2.500, the land surface has significant influence on the DV and multi-fractal parameters(capacity dimension D0, information dimension D1, correlation dimension D2, and D1/D0), that is, the ANOVA indicates that the coarseness of soil particles in desert is significantly higher (pV, and positively correlated with multi-fractal parameters, DV and multi-fractal parameters are mainly affected by the content of clay and content of fine sand, respectively. This study analyzed the microstructure of soil particles in detail, which can provide the theoretical basis for soil improvement and actual production of different land surfaces in Qilian Mountains, and scientific basis for ecological environment management.