Soil particle size distribution and fractal characteristics of different ecosystems on the southern slope of Qilian M ountains
[Objective]In order to explore the soil particle size distribution and fractal characteristics of different ecological system on the southern slope of Qilian Mountains,and to provide scientific basis for regional soil and water conservation.[Method]Picea crassifolia,alpine shrub and alpine grassland ecosystems were selected as the research objects.The laser diffraction technology was used to determine the soil particle size composition.The regression rela-tionship between soil particle size and volume fractal dimension was fitted.The soil particle size distribution and frac-tal characteristics were analyzed,and the effect of soil water storage performance on it was explored.[Result]1)The soil texture of each ecological system was mainly silty-sandy loam with clay components.The grain size frequency curves of picea crassifolia and alpine grassland were bimodal,but the alpine shrub was multimodal,among which grain size composition was complex.2)The correlation between soil particle size and volume fractal dimension of each eco-logical system was clay>sand>silt,and high correlation was found in alpine shrub.3)Different ecological system were affected by different water storage indexes,but the influence of soil bulk density and total porosity was universal.[Conclusion]The alpine shrub ecological system in the study area has a better soil and water conservation effect,but shows a trend of degradation,so the protection should be strengthened.
south slope of Qilian Mountainssoil particle size distributionsoil and water conservationfractal di-mensionsoil water storage
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