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Do biochar and polyacrylamide have synergistic effect on net denitrification and ammonia volatilization in saline soils?
- Source :
- Environmental Science and Pollution Research. 28:59974-59987
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- Salt-affected soils have poor structure and physicochemical properties, which affect soil nitrogen cycling process closely related to the environment, such as denitrification and ammonia volatilization. Biochar and polyacrylamide (PAM) have been widely used as soil amendments to improve soil physicochemical properties. However, how they affect denitrification and ammonia volatilization in saline soils is unclear. In this study, the denitrification and ammonia volatilization rates were measured in a saline soil field ameliorated with three biochar application rates (0%, 2%, and 5%, w/w) and three PAM application rates (0‰, 0.4‰, and 1‰, w/w) over 3 years. The results showed that denitrification rates decreased by 23.63-39.60% with biochar application, whereas ammonia volatilization rates increased by 9.82-25.58%. The denitrification and ammonia volatilization rates decreased by 9.87-29.08% and 11.39-19.42%, respectively, following PAM addition. However, there was no significant synergistic effect of biochar and PAM amendments on the denitrification and ammonia volatilization rates. The addition of biochar mainly reduced the denitrification rate by regulating the dissolved oxygen and electrical conductivity of overlying water and absorbing soil nitrate nitrogen. Meanwhile, biochar application increased pH and stimulated the transfer of NH4+-N from soil to overlying water, thus increasing NH3 volatilization rates. Hence, there was a tradeoff between denitrification and NH3 volatilization in the saline soils induced by biochar application. PAM reduced the denitrification rate by increasing the infiltration inorganic nitrogen and slowing the conversion of ammonium to nitrate. Moreover, PAM reduced the concentration of NH4+-N in the overlying water through absorbing soil ammonium and inhibiting urea hydrolysis, thereby decreasing NH3 volatilization rate.
- Subjects :
- Denitrification
Health, Toxicology and Mutagenesis
Acrylic Resins
chemistry.chemical_element
General Medicine
010501 environmental sciences
Ammonia volatilization from urea
01 natural sciences
Pollution
Nitrogen
Soil conditioner
Soil
chemistry.chemical_compound
chemistry
Nitrate
Ammonia
Charcoal
Environmental chemistry
Soil water
Biochar
Environmental Chemistry
Ammonium
Volatilization
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 16147499 and 09441344
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Environmental Science and Pollution Research
- Accession number :
- edsair.doi.dedup.....8f8d2e8c3168c4e6df62947e9c2bc09d