Investigation of Fe(II) and Mn(II) involved anoxic denitrification in agricultural soils with high manganese and iron co
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SOILS, SEC 5 • SOIL AND LANDSCAPE ECOLOGY • RESEARCH ARTICLE
Investigation of Fe(II) and Mn(II) involved anoxic denitrification in agricultural soils with high manganese and iron contents Baokun Xu 1 & Liangsheng Shi 1 & Hua Zhong 1 & Kang Wang 1 Received: 1 March 2020 / Accepted: 9 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose Soil denitrification rates and the roles Mn(II) and Fe(II) played as alternative electron donors were investigated by performing anoxic incubation experiments, using agricultural soils from Guangxi Autonomous Region, South China. Materials and methods The dynamic of Mn(II) and Fe(II), electron contributions of Mn(II) and Fe(II) to denitrification, potential denitrification capacity, and gaseous-N composition were investigated. Results and discussion The results indicated that Mn(II) and Fe(II) act as electron donors during the denitrification of paddy soils with high Mn and Fe contents. Coupling of denitrification and Fe(II) oxidation and coupling of denitrification and Mn(II) oxidation was found in paddy soils from the villages of Xialei. The maximum electron contributions of Mn(II) and Fe(II) to denitrification were similar, both reaching 18%, although the total Mn content was lower than the total Fe content. On the contrary, the roles and contributions of Mn(II) and Fe(II) to denitrification in soils from upland fields were not proved, even though all the studied agricultural soils had high Mn and Fe contents. Conclusions The results suggested that Mn(II) is an important but previously ignored electron donor for denitrification and that Mn(II) plays a vital role in denitrification in paddy soils. Keywords Denitrification . Fe(II) oxidation coupled to denitrification . Mn(II) oxidation coupled to denitrification . Agricultural soils
1 Introduction Nitrogen (N) fertilizers have been applied intensively to agricultural soils, particularly in China, in recent decades to give Responsible editor: Jizheng He Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11368-020-02776-z) contains supplementary material, which is available to authorized users. * Liangsheng Shi [email protected] Baokun Xu [email protected] Hua Zhong [email protected] Kang Wang [email protected] 1
State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
high crop yields. This strategy has led to soil, atmosphere, and aquatic systems becoming polluted (Ding et al. 2014; Han et al. 2018; Kumar et al. 2019). Concerns about N pollution of the environment have been raised, and numerous studies focused on N cycling in agricultural soils have been performed (Long et al. 2012; Qu et al. 2014; Zhang et al. 2019). Denitrification, a microbially mediated process through which nitrate (NO3−) is reduced to nitrous oxide (N2O) or dinitrogen (N2), is one of the main processes through which N is lost from soil (Prasertsak et al. 2002; Chen et al. 2008). Denitrification can be divided into
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