| 张娜,张红玲,屈忠义,张栋良.内蒙古河套灌区不同土层有机质空间变异的分形[J].干旱地区农业研究,2017,35(5):157~163 |
| 内蒙古河套灌区不同土层有机质空间变异的分形 |
| 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 |
| 中文关键词: 有机质 不同土层 空间异质性 多重分形 联合多重分形 内蒙古河套灌区 |
| 英文关键词:organic matter different soil layers spatial variation multifractal joint multifractal Inner Mongolia hetao irrigation district |
| 基金项目:国家自然科学基金项目(51469020) |
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| 中文摘要: |
| 以内蒙古河套灌区解放闸灌域为研究对象，以区域内间隔4 km等间距112个取样点共448个样本为基础，通过多重分形及联合多重分形方法，对有机质含量在不同土层（0～20 cm、20～40 cm、40～70 cm与70～100 cm）的空间变异特性及其相互关系进行研究。结果显示，有机质含量0～20 cm至70～100 cm土层的多重分形谱宽度依次为0.933、0.795、0.824、0.805，即在0～20 cm土层空间变异性最大，而20～40 cm土层空间变异性最小。不同土层多重分形谱曲线均表现为左钩状（Δf＞0），表明在灌域内土壤有机质的空间分布中，数值较大的数据占主导地位。同时从土壤表层到埋深1 m处D(1)/D(0)依次为0.983、0.980、0.973、0.965，其值逐渐减小，即空间分布逐渐由密集区域向稀疏区域转化。联合多重分形分析表明0～20 cm土层与20～40 cm、40～70 cm土层空间变异相关程度较高，而与70～100 cm土层空间变异相关程度较低。 |
| 英文摘要: |
| 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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