| Influence of flue gas desulphurization gypsum on characteristics of soil aggregates in sodic soil |
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| DOI：10.7606/j.issn.1000-7601.2013.06.020 |
| Key Words: sodic soil flue gas desulphurization gypsum soil aggregates organic-inorganic compound particles |
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| Abstract: |
| To investigate the influence of flue gas desulphurization gypsum（FGDG） on the physical properties of sodic soil, a field experiment was conducted to study the effects of the different dosage of FGDG on the aggregation and stability of soil aggregates. The results indicated that compared to the control, content of aggregates above 0.25 mm by dry and wet sieving (DR0.25 and WR0.25), aggregate mean mass diameter(MWD), and geometric mean diameter (GMD) in 0～20 cm sodic soil layer increased by the range of 2.69%～45.29%, 126.59～304.70%, 2.63%～10.46%, and 7.98%～19.01%, respectively, by adding FGDP. Meanwhile, DR0.25, MWD, and GMD increased significantly with the increasing FGDG rat
e, and the fractal dimensions of FGDG treatment were significantly lower than the control in 0～20 cm soil layer. In 0～20 cm soil layer, the aggregate destruction (PAD) and unstable aggregate index (ELT) were significantly reduced as FGDG rate increased. In addition, concentration of Ca2+ bridges compound particles (G1) was increased for amelioration with FGDG, which may be associated with the promotion effect of organic molecules (OM) attached to clay (Cl) a
nd polyvalent cations (P) (Cl-P-OM). Futher, concentration of the water solubility composite particles (G0) in all FGDG treatments was significantly lower than the control. It is concluded that the FGDG contributed to the formation of organic-inorganic compound particles, which significantly improved the content and stability of aggregates in sodic soil. |
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