TY - JOUR
T1 - A quantitative study on three-dimensional pore parameters and physical properties of sodic soils restored by FGD gypsum and leaching water
AU - Liao, Renkuan
AU - Yu, Haoliang
AU - Lin, Henry
AU - Yang, Peiling
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant No. 40971130 ) and China Post-doctoral International Exchange Program (Grant No. 20180003 ). We would like to thank Drs. Ekaterina Bazileskaya and Zuleima Karpyn at Pennsylvania State University for their support and guidance on the reconstruction and quantitative analysis of three-dimensional soil pore systems.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/10/15
Y1 - 2019/10/15
N2 - The application of flue gas desulfurization (FGD) gypsum has been recognized as a feasible measure in enhancing the quality of sodic soils. Quantitative evaluation of the effects of FGD gypsum on three-dimension (3D) pore characteristics is beneficial for understanding the reclamation mechanism of FGD gypsum on sodic soils. We collected intact soil cores from a sodic field at four depths (0–10, 10–20, 20–40, and 40–60 cm) in northern China to reconstruct 3D pore structures using X-ray computed tomography (CT), thus quantifying the effects of FGD gypsum (10.1 and 14.5 t hm−2) and leaching water (1520 and 2200 t hm−2) on the 3D pore characteristics and related soil physical properties. The treatments using FGD gypsum with leaching water promoted the formation of new pores and significantly (p < 0.05) increased the 3D image-based macroporosity, mesoporosity, total pore length, and number of nodes at depths of 0–20 cm, improving the permeability of sodic soils investigated, which is validated by the enhanced saturated hydraulic conductivity (Ksat). Irrigation water of 1520 t hm−2 is demonstrated effective in assisting FGD gypsum dissolution and leaching, but excessive leaching water (2200 t hm−2) may reduce the permeability of 20–40 cm depth. The combined application of 14.5 t hm−2 FGD gypsum and 1520 t hm−2 leaching water is suggested to obtain the optimal result for the investigated sodic soils. This study offers an applicable strategy for sodic soils reclamation and provides a reference for revealing the improvement mechanism of sodic soils by FGD gypsum and leaching water.
AB - The application of flue gas desulfurization (FGD) gypsum has been recognized as a feasible measure in enhancing the quality of sodic soils. Quantitative evaluation of the effects of FGD gypsum on three-dimension (3D) pore characteristics is beneficial for understanding the reclamation mechanism of FGD gypsum on sodic soils. We collected intact soil cores from a sodic field at four depths (0–10, 10–20, 20–40, and 40–60 cm) in northern China to reconstruct 3D pore structures using X-ray computed tomography (CT), thus quantifying the effects of FGD gypsum (10.1 and 14.5 t hm−2) and leaching water (1520 and 2200 t hm−2) on the 3D pore characteristics and related soil physical properties. The treatments using FGD gypsum with leaching water promoted the formation of new pores and significantly (p < 0.05) increased the 3D image-based macroporosity, mesoporosity, total pore length, and number of nodes at depths of 0–20 cm, improving the permeability of sodic soils investigated, which is validated by the enhanced saturated hydraulic conductivity (Ksat). Irrigation water of 1520 t hm−2 is demonstrated effective in assisting FGD gypsum dissolution and leaching, but excessive leaching water (2200 t hm−2) may reduce the permeability of 20–40 cm depth. The combined application of 14.5 t hm−2 FGD gypsum and 1520 t hm−2 leaching water is suggested to obtain the optimal result for the investigated sodic soils. This study offers an applicable strategy for sodic soils reclamation and provides a reference for revealing the improvement mechanism of sodic soils by FGD gypsum and leaching water.
UR - http://www.scopus.com/inward/record.url?scp=85071762073&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85071762073&partnerID=8YFLogxK
U2 - 10.1016/j.jenvman.2019.109303
DO - 10.1016/j.jenvman.2019.109303
M3 - Article
C2 - 31466180
AN - SCOPUS:85071762073
SN - 0301-4797
VL - 248
JO - Journal of Environmental Management
JF - Journal of Environmental Management
M1 - 109303
ER -