Comparing ameliorative effects of biomass ash and alkaline slag on an acidic Ultisol under artificial Masson pine: A field experiment

• DOI: 10.1016/j.jenvman.2021.113306
• Publication Date: 2021-07-16T22:41:42Z
• Authors: Renyong Shi; Hongwei Lai; Ni Ni; Jackson Nkoh Nkoh; Peng Guan; Hailong Lu; Xian He; Wenrui Zhao; Chenyang Xu; Zhaodong Liu; Jiuyu Li; Renkou Xu; Xiumin Cui; Wei Qian
• Keywords: Soil; 13. Climate action; Soil Pollutants; 0401 agriculture, forestry, and fisheries; Biomass; 04 agricultural and veterinary sciences; 15. Life on land; Pinus; Ecosystem; 6. Clean water

Forest soil acidification caused by acid deposition is a serious threat to the forest ecosystem. To investigate the liming effects of biomass ash (BA) and alkaline slag (AS) on the acidic topsoil and subsoil, a three-year field experiment under artificial Masson pine was conducted at Langxi, Anhui province in Southern China. The surface application of BA and AS significantly increased the soil pH, and thus decreased exchangeable acidity and active Al in the topsoil. Soil exchangeable Ca2+ and Mg2+ in topsoil were significantly increased by the surface application of BA and AS, while an increase in soil exchangeable K+ was only observed in BA treatments. The soil acidity and active Al in subsoil were decreased by the surface application of AS. Compared with the control, soluble monomeric and exchangeable Al in the subsoil was decreased by 38.0% and 29.4% after 3 years of AS surface application. There was a minimal effect on soluble monomeric and exchangeable Al after the application of BA. The soil exchangeable Ca2+ and Mg2+ in the subsoil increased respectively by 54% and 141% after surface application of 10 t ha-1 AS. The decrease of soil active Al and increase of base cations in subsoil were mainly attributed to the high migration capacity of base cations in AS. In conclusion, the effect of surface application of AS was superior to BA in ameliorating soil acidity and alleviating soil Al toxicity in the subsoil of this Ultisol.