Effects of steel slag and biochar amendments on CO₂, CH₄, and N₂O flux, and rice productivity in a subtropical Chinese paddy field

Wang, Chun; Wang, Weiqi; Sardans i Galobart, Jordi; Singla, Ankit; Zeng, Congsheng; Lai, Derrick Yu Fo; Peñuelas, Josep

doi:10.1007/s10653-018-0224-7

Cita bibliogràfica -- Enllaç permanent: https://ddd.uab.cat/record/200850

Web of Science: 21 cites, Scopus: 23 cites, Google Scholar: cites,

Effects of steel slag and biochar amendments on CO₂, CH₄, and N₂O flux, and rice productivity in a subtropical Chinese paddy field
Wang, Chun (Fujian Normal University. Key Laboratory of Humid Subtropical Eco-geographical Process)
Wang, Weiqi

(Fujian Normal University. Key Laboratory of Humid Subtropical Eco-geographical Process)
Sardans i Galobart, Jordi

(Centre de Recerca Ecològica i d'Aplicacions Forestals)
Singla, Ankit (India. Ministry of Agriculture and Farmers Welfare. Regional Centre of Organic Farming)
Zeng, Congsheng (Fujian Normal University. Key Laboratory of Humid Subtropical Eco-geographical Process)
Lai, Derrick Yu Fo (Chinese University of Hong Kong. Department of Geography and Resource Management)
Peñuelas, Josep

(Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2019
Resum:	Steel slag, a by-product of the steel industry, contains high amounts of active iron oxide and silica which can act as an oxidizing agent in agricultural soils. Biochar is a rich source of carbon, and the combined application of biochar and steel slag is assumed to have positive impacts on soil properties as well as plant growth, which are yet to be validated scientifically. We conducted a field experiment for two rice paddies (early and late paddy) to determine the individual and combined effects of steel slag and biochar amendments on CO₂, CH₄, and N₂O emission, and rice productivity in a subtropical paddy field of China. The amendments did not significantly affect rice yield. It was observed that CO₂ was the main greenhouse gas emitted from all treatments of both paddies. Steel slag decreased the cumulative CO₂ flux in the late paddy. Biochar as well as steel slag + biochar treatment decreased the cumulative CO₂ flux in the late paddy and for the complete year (early and late paddy), while steel slag + biochar treatment also decreased the cumulative CH4 flux in the early paddy. The biochar, and steel slag + biochar amendments decreased the global warming potential (GWP). Interestingly, the cumulative annual GWP was lower for the biochar (55,422 kg CO₂-eq ha⁻¹), and steel slag + biochar (53,965 kg CO₂-eq ha⁻¹) treatments than the control (68,962 kg CO₂-eq ha⁻¹). Total GWP per unit yield was lower for the combined application of steel slag + biochar (8951 kg CO₂-eq Mg⁻¹ yield) compared to the control (12,805 kg CO₂-eq Mg⁻¹ yield). This study suggested that the combined application of steel slag and biochar could be an effective long-term strategy to reduce greenhouse gases emission from paddies without any detrimental effect on the yield.
Ajuts:	European Commission 610028 Ministerio de Economía y Competitividad CGL2013-48074-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-274
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Paddy ; Greenhouse gases ; Steel slag ; Biochar ; Rice productivity
Publicat a:	Environmental geochemistry and health, Vol. 41, issue 3 (June 2019) , p. 1419-1431, ISSN 0269-4042