| Fractal study on organic matter spatial heterogeneity of different soil layers in Inner Mongolia Hetao Irrigation District |
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| DOI：10.7606/j.issn.1000-7601.2017.05.23 |
| Key Words: organic matter different soil layers spatial variation multifractal joint multifractal Inner Mongolia hetao irrigation district |
| Author Name | Affiliation | | ZHANG Na | College of Water Resources and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China
Scientific Research Institute of Water Conservancy of Ningxia, Yinchuan, Ningxia 750021, China | | ZHANG Hong-ling | Scientific Research Institute of Water Conservancy of Ningxia, Yinchuan, Ningxia 750021, China | | QU Zhong-yi | College of Water Resources and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | ZHANG Dong-liang | College of Water Resources and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China |
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| Abstract: |
| The Jiefangzha irrigation district in the Inner Mongolia Hetao irrigation area was taken as research subject. Based on 448 samples of 112 sampling points at 4 km of interval distance in the region, and using multi-fractal and joint multi-fractal method, we studied the spatial variability of organic matter concentration in different soil layers (0～20 cm, 20～40 cm, 40～70 cm, 70～100 cm) and their characteristics in the multiscale correlation. Results showed that the organic matter concentration in 20～40 cm soil layer had the smallest spatial variability, and in the surface was the strongest(Δα of 0～20 cm to 70～100 cm soil layer was 0.933、0.795、0.824 and 0.805). The multi-fractal spectrum curve of different layers showed a left hook (Δf>0), indicating that the larger data dominated. Also, the spatial distribution gradually transformed from the dense region to the sparse region from the surface to the 1m depth(D(1)/D(0) from the surface to the 1 m depth was 0.983、0.980、0.973 and 0.965). The joint multi-fractal contour map and the corresponding singular index of different soil layers showed that the correlation between 0～20 cm and 20～40 cm、40～70 cm were relatively high, but with 70～100 cm soil layer was relatively low. |
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