脱硫副产物配合淋洗对碱化土壤团聚体含量的影响

doi:10.3864/j.issn.0578-1752.2016.04.010

Abstract

Abstract: 【Objective】The characteristics of soil aggregates are important factors that are generally used for soil structure evaluation. The objective of this study was to investigate the influence of the application of flue gas desulphurized (FGD) gypsum and water leaching on sodic soil aggregates, which can help assess the enhancement of soil structure after reclamation.【Method】A field experiment with nine reclamation treatments (three levels of FGD gypsum amount × three levels of leaching water) was conducted in the Hetao irrigation district in northern China. Intact soil samples were collected at 0-10cm, 10-20cm, 20-40cm, and 40-60 cm soil depths after reclamation. The bulk density, saturated hydraulic conductivity (Ksat), and characteristic parameters of soil aggregates, including the mean weight diameter (MWD), geometric mean diameter (GMD), the aggregate fractal dimension D, and the proportion of aggregates with a diameter higher than 0.25mm (DR0.25 and WR0.25, respectively) obtained by the dry and wet sieving methods, were used for analysis.【Result】The results indicated that reclamation treatments with both FGD gypsum and leaching water significantly decreased the bulk density and increased Ksat and the MWD and GMD of mechanic-stable aggregates at a 0-40 cm soil depth. In addition, the combined treatment with a high level of FGD gypsum (14.5 t·hm^-2) and a low level of leaching water (1.52×103 t·hm^-2) G2W1 showed the highest MWD and GMD of mechanic-stable aggregates. In general, the single reclamation treatments didn’t show a significant impact on the characteristics of soil aggregates, while the single treatments with leaching water alone had a significant higher fractal dimension D than the ones with FGD gypsum alone. The fractal dimension D in all combined treatments with a high level of FGD gypsum was lower than that of other treatments at a 0-60 cm soil depth. The MWD and GMD of the water-stable aggregates were significantly lower than those of the mechanic-stable ones. Most parameters of the sodic soil aggregates showed significant negative relations with the content of exchangeable sodium, exchangeable sodium percentage (ESP), and pH. The Ksat was positively related to the GMD, MWD, and DR0.25 of the mechanic-stable aggregates.【Conclusion】The combined reclamation treatments with both FGD gypsum and leaching water significantly increased sodic soil aggregates’ stability at a 0-40cm soil depth, suggesting that the structure of sodic soil was improved after reclamation. The reclamation with FGD gypsum alone maintained the stability of soil aggregates, while the ones with leaching water alone may have a negative influence on the formation of aggregates.

Key words: soil aggregate, flue gas desulphurized gypsum, water leaching, sodic soil reclamation

TAN Huang, YANG Pei-ling, REN Shu-mei, YU Hao-liang, WANG Jia-hang. Effects of the Application of Flue Gas Desulphurized Gypsum and Water Leaching on Sodic Soil Aggregates[J].Scientia Agricultura Sinica, 2016, 49(4): 705-716.

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