铁尾矿不同复垦模式土壤贮水能力及入渗特征

doi:10.16843/j.sswc.2019.04.008

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Abstract [Background]A large amount of solid waste results from the large-scale mining of iron ore, thus it seriously damages the ecological environment. The soil erosion, environmental pollution and soil degradation occur in the iron tailings area, thus reclamation of iron tailings is very important to improve the ecological quality of mining area. Because the tailings reconstituted soil type is different from the general natural soil, the effects of reclaimed soil types on water storage and infiltration processes remains being discussed.[Methods]In this research, the double-ring infiltration method was used to study the soil infiltration process and water storage characteristics of 6 reclamation patterns (STJ tailings-soil-mushroom residue, ST1 tailings-soil, ST2 tailings-soil, SJ1 tailings-mushroom residue, SJ2 tailings-mushroom residue, and T pure soil) and control bare sand(CK),and three infiltration models of Horton, Philip,and Kostiakov were used to simulate the water infiltration process.[Results] 1)The improvements of soil water storage performance by reclamation were as followed:soil non-capillary water storage > soil saturated water storage > soil capillary water storage. The water-holding capacity in the reclamation mode of mixed mushroom residue (SJ1,SJ2,and STJ)is higher than that in the reclamation patterns of mixed soil (ST1 and ST2). 2)The soils in 6 reclamation patterns had the same trend of average infiltration rate and initial infiltration rate,which was 1.17-4.93 times of the bare sand, and the infiltration performance of pure soil was the best in different reclamation patterns. The average infiltration of mixed mushroom residue (SJ1, SJ2, and STJ)(1.958 mm/min) was higher than that of mixed soil (ST1 and ST2)(1.106 mm/min). 3)The model fitting accuracy analysis showed that Horton model was suitable for simulating the infiltration process of bare tailings and Kostiakov model was the best model to describe the others. 4)For the seven reclamation patterns with short reclamation years,bulk density and porosity were the key factors affecting the infiltration performance of the tailings,and the relationship with vegetation types was not obvious.[Conclusions]The data of this study shows that the soil mixed mushroom residue has higher water storage capacity and infiltration performance, which is beneficial to plant absorption and accelerated vegetation restoration process. Considering the iron ore tail area is lacking soil source, in practice, it can be considered to apply mushroom residue as an modified material in iron tailings to repair the ecological environment, which is conducive to soil and water conservation and sustainable growth of vegetation. The results of water infiltration studies of soils in different reclamation patterns can provide theoretical support for further ecological restoration and soil-water conservation of iron tailings.

Key words： iron tailings reclamation patterns water infiltration water storage performance infiltration model

Received: 20 August 2018

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S152.7

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	Articles by authors
	LV Chunjuan
	CHEN Dan
	GUO Xingxing
	WANG Yu
	GUO Yansong

Cite this article:

LV Chunjuan,CHEN Dan,GUO Xingxing, et al. Water storage capacity and the infiltration characteristics of soil in different reclamation modes in iron tailings[J]. SSWC, 2019, 17(4): 59-66.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.04.008 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I4/59

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