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[1]GAN Fengling,WANG Tao,HE Binghui,et al.Fractal Feature of Soil in the Different Types of Vegetation in Wenchuan Earthquake Zone[J].Research of Soil and Water Conservation,2018,25(01):84-91.

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Fractal Feature of Soil in the Different Types of Vegetation in Wenchuan Earthquake Zone

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 01 Page number: 84-91 Column: Public date: 2018-02-28

Title:: Fractal Feature of Soil in the Different Types of Vegetation in Wenchuan Earthquake Zone

Author(s):: GAN Fengling¹, WANG Tao², HE Binghui¹, TAN Ziyang¹, YANG Bing¹; 1. College of Resources and Environment, Southwest University, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, Chongqing 400715, China;
2. Central Southern China Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group, Wuhan, Hubei 430071, China

Keywords:: Wenchuan earthquake area; landslide deposit; fractal dimension; soil micro-aggregate

CLC:: S152.3;S152.7

DOI:: -

Abstract:: 5·12 Wenchuan earthquake triggered a large number of serious geological disasters, mainly including landslide, collapse, mud-flow, surface subsidence and so on. The earthquake made the environment more fragile, and strongly threatened the safety of people’s lives and property. This result showed that vegetation restoration was the key factor to ecological restoration in earthquake area, but few studies had suggested the fractal dimension of water-stable aggregates, micro-aggregates and soil particle in different types of vegetation restoration in earthquake area. This study, therefore, was performed in the Wenchuan earthquake area, where has been restored by vegetation for 8 years. To study the effects of vegetation types on soil fractal dimension, we suggested five vegetation types (bare land, grassland, shrub-land, conservation forest and corn-filed) with 3 treatments and 162 samples. The results showed that air-dried soil aggregate (> 5 mm) was the dominant aggregate. After wet screen processing, the soil aggregate (< 0.25 mm) was the dominant aggregate. And compared with the control plot, the MWD of soil water-stable aggregates of bare land, grassland, shrub-land, conservation forest and corn-filed reduced by 74.88%, 40.30%, 40.73%, 46.98%, 47.65%, respectively. The soil micro-aggregates of 1～0.25 mm size were dominant aggregates in Wenchuan earthquake samples, and followed by soil micro-aggregates of 0.25～0.05 mm. The range of fractal features of soil micro-aggregates was 2.327～2.853. The sequence of fractal features of soil micro-aggregates for different types of vegetation restoration was corn-filed > conservation forest > shrub-land > bare land > grassland > control plot. The fractal dimension of particle size distribution was negatively correlated with soil sand (1～0.05 mm) (D=2.926～0.002X_sand), and significantly negatively correlated with soil silt (0.05～0.002 mm) (D=3.05～0.008X_silt, p < 0.01), and significantly positively correlated with soil clay (< 0.002 mm) (D=2.595+0.009X_clay, p < 0.01). The soil was disturbed obviously under the earthquake damage, soil gravel content increased, the fractal dimensions of micro-aggregates and soil particles increased gradually. The results from the study of soil structure characteristics could provide some references for post-quake reconstruction and natural ecological systems.

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