Effect of biochar on soil structure and storage of soil organic carbon and nitrogen in the aggregate fractions of an Albic soil

Urhie Ewhoyerure Josepha, Adegoke O. Toluwasea, Erinle Olajide Kehindeb, Ejoh Eyinmisan Omasanc, Akande Y. Tolulopea, Odugbenro O. Georgea, Chengsen Zhaoa & Wang Hongyan*aa College of Resource and Environment, Northeast Agricultural University, Harbin, Heilongjiang, Chinab School of Agriculture, Food, and Wine, University of Adelaide, Australiac College of Life Science, Department of Microbiology, Northeast Agricultural University, Harbin, Heilongjiang, ChinaCONTACT Wang Hongyanwhy220@126.com College of Resource and Environment, Northeast Agricultural University, China, 59, Mucai Street, Xiangfang District, Harbin, Heilongjiang Province, ChinaABSTRACTField experiment was conducted to evaluate the effect of corn straw derived-biochar (700 °C) applied at 0 (control), 10 (B1), 20 (B2) and 30 t ha−1 (B3) on water stable aggregate (WSA), mean weight diameter (MWD), total organic carbon (TOC) and total nitrogen (TN) in WSA fractions of Albic soil. Compared with control, WSA in > 2 mm fraction increased, by 40.8% and 51.5% (0–10 cm depth) in B1 and B3, respectively. B1, B2 and B3 (10–20 cm depth) increased by 55.2%, 69.6% and 62.4%, respectively. MWD increased by 34.4%, 21.6%, and 17.6% with B3 at 0–10 cm, 10–20 cm and 20–30 cm depths, respectively. TOC in the > 2 mm fraction increased by 28.6%, 22.1%, and 23.2% (0–10 cm depth) in B1, B2, and B3, respectively, TN in 2–0.5 mm fractions increased by 32.4%, 23.4% and 33.6% (0–10 cm depth); and in the 0.25–0.05 mm fractions increased by 14.8%, 19.8% and 18.7% (10–20 cm depth), in B1, B2 and B3, respectively. Our findings suggest biochar application at 30 t ha−1 could improve structural stability and sequestration of TOC and TN in Albic soils.