Coupled variations of soil temperature and moisture in reclaimed fields filled with coal gangue of different grain size distributions

Zhang, Kun; Xu, Liangji; Huang, Guodong; Meng, Xue-ying; Yao, Jin-xin; Jiang, Bao-xing

doi:10.1007/s11368-020-02579-2

Cited by 12 publications

(5 citation statements)

References 52 publications

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“…The properties of CG, low heat capacity, high thermal conductivity, and much higher thermal diffusivity than that of soil [7], will inevitably affect the varied process of surface water and heat, and further affect the movement of water inside the reclaimed soil and the growth of vegetation. Single layer filled reclamation resembles CG overlaid by soil, as reported in literature [41,42]. Few studies focused on multi-layer filling reclamation and the consequent reclaimed effect of the profiles' contribution.…”

Section: Introductionmentioning

confidence: 82%

Evaluation of Soil Quality and Maize Growth in Different Profiles of Reclaimed Land with Coal Gangue Filling

Gong

2021

Land

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Reclaiming subsidence and waterlogged zones caused by coal mining to maintain food and feed supplies is an urgent issue in China. Utilizing coal gangue (CG) as a filling matrix to construct different profiles of reclaimed land in coal mining subsidence has downsides, e.g., due to its low conservative capability of water-fertilizer and crop yield, its lack of quantitative evaluation of soil quality, and its limiting factors of crop growth. Quantifying the soil quality by principal component analysis (PCA), obtaining key soil indicators, and a scoring system can clarify the influence of the profile structure on soil quality and limiting productive factors of soil and ascertain the optimal profile. Soil quality was evaluated by the minimum data set (MDS) of soil quality index (SQI) obtained by PCA in seven different profiles of reclaimed plots constructed in a field with maize planting experiments. The agronomic traits of maize were analyzed and compared. The result shows that the pH value contributed highest in surface SQI value. Maximal and minimal SQI value is 0.57 and 0.18, respectively, the variation of SQI between different profiles reveals it increases with the increase in thickness of overburdens and decreases with the increase in soil interlayer depth of reclaimed land. SQI based on MDS has a correlation coefficient of 0.4280 with maize yield and the same sequence with comprehensive growth of maize in reclaimed plots. Agronomic traits of maize are positively correlated with the nutrient index and SM of the surface soil, and negatively correlated with pH, electrical conductivity (EC), and total salt content (TS). Choosing a thicker surface overburden and control pH of CG preceding filling can effectively augment soil quality and maize growth. This study provides the exploratory means and a scientific basis for the management and improvement of filling reclamation.

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Section: Introductionmentioning

confidence: 82%

Evaluation of Soil Quality and Maize Growth in Different Profiles of Reclaimed Land with Coal Gangue Filling

Gong

2021

Land

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“…This result indicates that mulching with a smaller particle size reduced the infiltration capacity. This is because coal gangue with a fine particle size is more in contact with air and water and can develop narrower capillary pores, enhance water holding capacity, and slow down water infiltration 53 . Conversely, pores in coal gangue with a coarse particle size mainly develop non-capillary pores, and water migrates downwards under the effect of gravity.…”

Section: Discussionmentioning

confidence: 99%

Influence of coal gangue mulching with various thicknesses and particle sizes on soil water characteristics

Han

Dong

Geng

et al. 2021

Sci Rep

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Water availability seriously affects vegetation restoration in arid mining areas, and mulching is an effective way to improve soil water conditions. Coal gangue occupies large swathes of land resources, resulting in ecological fragility and various environmental problems. Despite coal gangue having mineral elements similar to those in soil, its potential function as a mulch for soil water conservation has been unclear. Herein, mulching on the surfaces of soil columns with 30 cm height and 15 cm inner diameter was conducted using coal gangue with four particle size ranges (0–0.5, 0.5–1, 1–2, and 2–4 cm) and four thicknesses (4, 8, 12, and 16 cm) under laboratory conditions to investigate water infiltration and evaporation under different conditions. The cumulative infiltration of the treatments with mulching thicknesses of 4 cm (T1), 8 cm (T2), 12 cm (T3), and 16 cm (T4) was 16.1%, 22.9%, 28.6%, and 41.6% greater than that of the control, respectively. The cumulative evaporation of the treatments with particle size ranges of 0–0.5 cm (P1), 0.5–1 cm (P2), 1–2 cm (P3), and 2–4 cm (P4) was 6.5%, 28.6%, 22.9%, and 18.6% lower than the control, respectively. Overall, to enhance the soil water storage capacity in mining areas, the results suggest that coal gangue mulching with a thickness of 8–16 cm and particle size range of 0.5–2 cm is suitable.

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“…This result indicates that mulching with a smaller particle size reduced the in ltration capacity. This is because coal gangue with a ne particle size is more in contact with air and water and can develop narrower capillary pores, enhance water holding capacity, and slow down water in ltration [53]. Conversely, pores in coal gangue with a coarse particle size mainly develop non-capillary pores, and water migrates downwards under the effect of gravity.…”

Section: Effect Of Coal Gangue Mulching On Water In Ltrationmentioning

confidence: 99%

Influence of Coal Gangue Mulching With Various Thicknesses and Particle Sizes on Soil Water Characteristics

Han

Dong

Geng

et al. 2021

Preprint

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Water availability seriously affects vegetation restoration in arid mining areas, and mulching is an effective way to improve soil water conditions. Coal gangue occupies large swathes of land resources, resulting in ecological fragility and various environmental problems. Despite coal gangue having mineral elements similar to those in soil, its potential function as a mulch for soil water conservation has been unclear. Herein, mulching on the surfaces of soil columns was conducted using four particle size ranges and four thicknesses under laboratory conditions to investigate water infiltration and evaporation under different conditions. Apart from the treatments with particle size of 0–0.5 cm, the remaining mulch treatments with 16 cm thickness involved greater infiltration and lower evaporation. Therefore, we recommend a 16 cm-thick mulch treatment as the preferred mulching style. Treatments with a particle size of 0–0.5 cm and those with 4-cm thickness are not suggested due to their lower infiltration and higher evaporation characteristics. Overall, to enhance the soil water storage capacity in mining areas, the results suggest that mulching coal gangue with particle size exceeding 0.5 cm and a thickness exceeding 8 cm is suitable.

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Coupled variations of soil temperature and moisture in reclaimed fields filled with coal gangue of different grain size distributions

Cited by 12 publications

References 52 publications

Evaluation of Soil Quality and Maize Growth in Different Profiles of Reclaimed Land with Coal Gangue Filling

Evaluation of Soil Quality and Maize Growth in Different Profiles of Reclaimed Land with Coal Gangue Filling

Influence of coal gangue mulching with various thicknesses and particle sizes on soil water characteristics

Influence of Coal Gangue Mulching With Various Thicknesses and Particle Sizes on Soil Water Characteristics

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