1. Vermicompost and flue gas desulfurization gypsum addition to saline-alkali soil decreases nitrogen losses and enhances nitrogen storage capacity by lowering sodium concentration and alkalinity.
- Author
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Li, Siping, Wang, Chong, Huang, Huiying, Zhao, Lei, Cao, Jia, and Wang, Binglei
- Subjects
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FLUE gas desulfurization , *RADIOLABELING , *SOIL productivity , *CROP yields , *SOIL structure , *GYPSUM - Abstract
Saline-alkali soils have poor N storage capacity, high N loss and inadequate nutrient supply potential, which are the main limiting factors for crop yields. Vermicompost can increase organic nutrient content, improve soil structure, and enhance microbial activity and function, and the Ca2+ in flue gas desulfurization (FGD) gypsum can replace Na+ and neutralize alkalinity in saline-alkali soils though chemical improvement. This study aimed to determine if vermicompost and FGD gypsum addition could improve the N storage capacity through decreasing NH 3 volatilization and 15N/NO 3 − leaching from saline-alkali soils. The results indicate that the combined application of vermicompost and FGD gypsum led to the displacement and leaching Na+ in the upper soil layer (0–10 cm), as well as the neutralization of HCO 3 − by the reaction with Ca2+. This treatment also improved soil organic matter content and macroaggregate structure. Also, these amendments significantly increased the abundance of nifH and amoA genes, while concurrently decreasing the abundance of nirK gene. The structural improvements and the lowering of Na + concentration in and alkalinity decreased cumulative NH 3 volatilization, and leaching of 15N and NO 3 − to the deep soil layer (20–30 cm). FGD gypsum increased the 15N stocks and inorganic N stocks of saline-alkali soil, whereas vermicompost not only increased the 15N and inorganic N stocks, but also increased the total N stocks, the combination of vermicompost and FGD gypsum can not only increase the available N storage capacity, but also enhance the potential for N supply. Therefore, vermicompost and FGD gypsum decrease N loss and increase N storage capacity through structural improvement, and lowering of Na+ concentration and alkalinity, which is crucial for improving the productivity of saline-alkali soil. • Decreasing Na + could reduce NH 3 volatilization, NO 3 − leaching and 15N loss rate. • Decreasing alkali and increasing amoA genes could reduce NH 3 volatilization. • Vermicompost and FGD gypsum improved available N storage capacity. • Vermicompost increased the total N stock to enhance potential for N supply. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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