Inhibiting effects of flue gas desulfurization gypsum on soil phosphorus loss in Chongming Dongtan, southeastern China

To explore the possibility of using flue gas desulfurization gypsum (FGDG) for inhibiting phosphorus (P) loss due to agricultural
runoff, a 3-year study was performed in the farmlands of Chongming Dongtan between 2012 and 2015. Five different quantities
of FGDG were used to treat the soil, and the effects of different treatments on the characteristics of soil P and crop growth were
investigated. The results showed that 2 years after application of FGDG, the soil density at a depth of 0–10 cm decreased by 4.35–
7.97%, the porosity increased by 1.77–11.0%, and the topsoil permeability increased by 0.87–3.81 times. Although the use of
FGDG did not change the total P concentration in the soil, it decreased the concentration of sodium bicarbonate extractable P in
the soil. Compared to the control, the average extractable P concentration at depths of 0–10 cm, 10–20 cm, and 20–30 cm
decreased by 22.0–46.1%, 26.9–40.5%, and 22.8–34.8%, respectively. The inorganic P in the soil increased as the amount of
FGDG increased, and the increase was mainly as Ca–P in the forms Ca2–P andCa10–P. The decrease in bicarbonate extractable P
and increase in inorganic P in the soil did not affect the growth of the crops, and the biomass and output of the crops increased
compared to the control. Therefore, FGDG can enhance soil P immobilization, thus reducing soluble P runoff from farm fields,
and improving water quality in receiving lakes and rivers while maintaining P nutrition to the crops.
刊物名称: 
Environmental Science and Pollution Research
年: 
2019
卷期: 
26(17)
页码: 
17195-17203
作者: 
He Kun; Li Xiaoping
论文原文: