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Université du Xinjiang (2017)

Study on Fractal of Soil Particles and Estimation on Wind Erosion Amount in Zhundong Area

张婷婷;

Titre : Study on Fractal of Soil Particles and Estimation on Wind Erosion Amount in Zhundong Area

Auteur : 张婷婷;

Grade : Master’s Theses 2017

Université : Université du Xinjiang

Résumé partiel
China is one of the countries with the most serious soil erosion.Because wind erosion is closely related to the sustainable development of regional economy,wind erosion research is closely watched by experts and scholars and government departments.Therefore,it is urgent to carry out the relevant research on the monitoring of soil wind erosion in arid and semi arid areas,and provide technical support for effective prevention and control of soil wind erosion and sandstorm disaster.Based on the fractal dimension of soil particle size,the spatial variability of the soil particle size is analyzed by using the soil particle size and the soil particle size.According to the measured data,137Cs tracer method was used to determine the soil erosion rate,and the correlation between the fractal dimension and the soil erosion rate was obtained.The following conclusions were drawn :(1)Zhundong region soil texture is mainly sandy loam and sandy soil.The soil particles in the study area are dominated by sand,and the soil particle size is concentrated in the relatively narrow particle size range of 0.04~0.2 mm.According the linear fit of ∑ui(q,δ)lg[ui(q,δ)]and lg(δ),generalized dimension spectrum D(q)~q curve of the soil particle size distribution in the study area,soil particle size in the study area shows non-uniform distribution and have multiple fractal characteristics It is feasible to analyze the particle size distribution of soil in Zhundong area.It is found that the content of sand in the soil is the main factor influencing the heterogeneity of the soil in the study area.With the increase of soil sand content,the distribution of soil particle size distribution in the loose area,the local concentration increased,the uneven distribution of soil particle size distribution increased.(2)From the analysis of grain size characteristics,it can be seen that the average particle size of soil particles is from fine to coarse and the average particle size range is 0.046~0.158 mm from cultivated land,grassland,bare land to semi-fixed dune,The results are consistent with the results of the distribution of soil particles in the 10 random soil samples in the study area and the distribution curve of soil particle size.he classification of different land use types is different,the sorting situation is getting better,the farmland sorting is poor,the grassland and the bare land sorting are worse,the semi-fixed dune sorting situation is higher than other land use types,The degree of selection is closely related to the depositional environment.In the Zhundong area,the cultivated land,grassland and bare land are polarized,the semi-fixed dune is positive,the symmetry of the soil particle size distribution is very poor,the soil sediment is fine and the average is moving in the fine direction.The distribution of peak distribution of different land use types is quite different,the distribution of soil particle size is not uniform and has a distinct dominant particle size level,Semi-fixed dune soil particle size distribution is more narrow,also shows that high vegetation coverage on the soil particle size distribution has a significant improvement.Due to the influence of vegetation,the distribution of soil grain size tends to be broad

Mots clés : fractal research; wind erosion amount; 137Cs; Zhundong area;

Présentation (CNKI)

Page publiée le 4 février 2018