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Article

Effects of Drying-Rewetting Cycles on Ferrous Iron-Involved Denitrification in Paddy Soils

1
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
2
Agricultural Water Conservancy Department, Changjiang River Scientific Research Institute, Wuhan 430010, China
*
Author to whom correspondence should be addressed.
Academic Editor: George Kargas
Water 2021, 13(22), 3212; https://doi.org/10.3390/w13223212
Received: 11 August 2021 / Revised: 26 October 2021 / Accepted: 8 November 2021 / Published: 12 November 2021
(This article belongs to the Special Issue Study of the Soil Water Movement in Irrigated Agriculture Ⅱ)
Soil moisture status has an important effect on the process of denitrification in paddy soils. However, it is unclear how it affects the ferrous iron-involved denitrification. Here, the influence of drying-rewetting cycles on ferrous iron-involved denitrification in paddy soil were studied with batch experiments. The dynamics of nitrate, ammonia, Fe2+, Fe3+ and total organic carbon (TOC), as well as nitrous oxide (N2O) were investigated using the iron-rich paddy soil in Jiangxi province, South China. Results demonstrated that the denitrification rate dropped while ammonia nitrogen content (NH4+-N) showed a rapid accumulation in the drying period. In the rewetting period, organic carbon played two-side roles. Organic carbon and ferrous iron together provided electron donors to denitrification, and organic carbon simultaneously reduced ferric iron under anaerobic environment. There were complex interactions among organic carbon, nitrate and Fe2+/Fe3+ under drying-rewetting cycles. Soil rewetting led to denitrification flush, especially after a moderately long drying period, while excessively frequent drying-rewetting alternation was not favorable to nitrate denitrification. View Full-Text
Keywords: denitrification; autotrophic denitrification; iron; drying and rewetting cycle; rewetting frequency denitrification; autotrophic denitrification; iron; drying and rewetting cycle; rewetting frequency
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MDPI and ACS Style

Zhang, Y.; Xu, B.; Han, J.; Shi, L. Effects of Drying-Rewetting Cycles on Ferrous Iron-Involved Denitrification in Paddy Soils. Water 2021, 13, 3212. https://doi.org/10.3390/w13223212

AMA Style

Zhang Y, Xu B, Han J, Shi L. Effects of Drying-Rewetting Cycles on Ferrous Iron-Involved Denitrification in Paddy Soils. Water. 2021; 13(22):3212. https://doi.org/10.3390/w13223212

Chicago/Turabian Style

Zhang, Yushuai, Baokun Xu, Jiangpei Han, and Liangsheng Shi. 2021. "Effects of Drying-Rewetting Cycles on Ferrous Iron-Involved Denitrification in Paddy Soils" Water 13, no. 22: 3212. https://doi.org/10.3390/w13223212

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