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JOURNAL OF NATURAL RESOURCES >

2018 , Vol. 33 >Issue 1: 37 - 51

DOI: https://doi.org/10.11849/zrzyxb.20161249

Soil Preferential Flow Characteristics under Different Land Utilization Styles in the Reclaimed Dump of Haizhou Surface Coal Mine

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  • 1. a. College of Environmental Science and Engineering, b. College of Mining Engineering,Liaoning Technical University, Fuxin 123000, China;
    2. College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China

Received date: 2016-11-15

  Revised date: 2017-04-01

  Online published: 2018-01-20

Supported by

National Natural Science Foundation of China, No. 51474119.

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Abstract

The macrospores, tubular channels and plant roots in the reclaimed soils of dump were the main reason for the formation of soil preferential flow. To better understand the morphological characteristics and variation of soil preferential flow in different land utilization styles in the dump, the dye staining experiment was carried out and physical and chemical analyses were used in the paper to investigate the formation mechanism and influencing factors of preferential flow in the process of revegetation. The results showed that: 1) Soil preferential flow in dump centered in the 0-40 cm soil layer where the proportion of dyed area ratio occupied more than 93% of the 0-60 cm soil layer. The characteristics of soil preferential flow differed significantly in different soils. The dyed area ratio in the 0-5 cm soil layer of arbor forest was higher than those of shrub land and weeds, and the order was Ulmus pumila land (90.37%), Robinia pseudoacacia land (79.84%), mixed forests land (65.37%), farmland (44.36%), shrub land (41.54%) and weeds land (38.38%). 2) The order of dyed area ratio in the 0-60 cm soil layer of all samples in the dump was Robinia pseudoacacia land (26.48%), Ulmus pumila land (20.12%), mixed forests land (17.32%), farmland (15.06%), shrub land (13.97%) and weeds land (10.07%). There was a good linear relationship between the dyed area ratio and the depth of soil layer. The Spearman correlation analysis was carried out between the dyed area ratio and soil factors, water factors and vegetation factors. The dyed area ratio has significant positive correlation (P<0.01) with gravel content, mean radius of soil macrospores, soil saturated hydraulic conductivity, root weight density and density of root with length less 1 mm density and significant positive correlation (P<0.05) with density of root with length 1-2 mm and 2-5 mm, and it has significant negative correlation (P<0.01) with bulk density, water content. The results provide a scientific basis for understanding the formation mechanism of preferential flow, restoring and reconstructing vegetation in dumps.

Key words： dump; dye staining experiment; preferential flow; revegetation; surface coal mine

Cite this article

LÜ Gang, FU Xin-yang, LI Ye-xin, LI Jun, WANG Ting . Soil Preferential Flow Characteristics under Different Land Utilization Styles in the Reclaimed Dump of Haizhou Surface Coal Mine[J]. JOURNAL OF NATURAL RESOURCES, 2018 , 33(1) : 37 -51 . DOI: 10.11849/zrzyxb.20161249

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