Key Laboratory of Humid Subtropical Eco-geographical Process, Ministry of Education, Fujian Normal University, Fuzhou, 350007, China.
Institute of Geography, Fujian Normal University, Fuzhou, 350007, China.
Environ Geochem Health. 2019 Jun;41(3):1419-1431. doi: 10.1007/s10653-018-0224-7. Epub 2018 Dec 7.
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 CO, CH, and NO emission, and rice productivity in a subtropical paddy field of China. The amendments did not significantly affect rice yield. It was observed that CO was the main greenhouse gas emitted from all treatments of both paddies. Steel slag decreased the cumulative CO flux in the late paddy. Biochar as well as steel slag + biochar treatment decreased the cumulative CO flux in the late paddy and for the complete year (early and late paddy), while steel slag + biochar treatment also decreased the cumulative CH 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 CO-eq ha), and steel slag + biochar (53,965 kg CO-eq ha) treatments than the control (68,962 kg CO-eq ha). Total GWP per unit yield was lower for the combined application of steel slag + biochar (8951 kg CO-eq Mg yield) compared to the control (12,805 kg CO-eq Mg 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.
钢渣是钢铁工业的副产品，含有大量的活性氧化铁和二氧化硅，可作为农业土壤中的氧化剂。生物炭是碳的丰富来源，假设生物炭和钢渣的联合应用对土壤特性以及植物生长有积极影响，但这些影响尚未得到科学验证。我们在中国亚热带稻田进行了为期两年的田间试验，以确定钢渣和生物炭改良剂对 CO、CH 和 NO 排放以及水稻生产力的单独和联合影响。这些改良剂并没有显著影响水稻产量。结果表明，CO 是所有处理措施下两种稻田排放的主要温室气体。钢渣降低了晚稻田的累积 CO 通量。生物炭和钢渣+生物炭处理措施降低了晚稻田和全年（早稻和晚稻）的累积 CO 通量，而钢渣+生物炭处理措施还降低了早稻田的累积 CH 通量。生物炭和钢渣+生物炭改良剂降低了全球变暖潜势（GWP）。有趣的是，生物炭（55422kg CO-eq ha）和钢渣+生物炭（53965kg CO-eq ha）处理的年累积 GWP 均低于对照（68962kg CO-eq ha）。与对照（12805kg CO-eq Mg 产量）相比，钢渣+生物炭联合应用的单位产量总 GWP 较低（8951kg CO-eq Mg 产量）。本研究表明，钢渣和生物炭的联合应用可能是一种减少稻田温室气体排放的有效长期策略，而不会对产量产生任何不利影响。
