Effects of biochar amendment on soil carbon dioxide emission and carbon budget in the karst region of southwest China

修正案 生物炭 二氧化碳 土壤水分 土壤呼吸 环境科学 农学 生长季节 土壤碳 问题10 总有机碳 土壤有机质 化学 动物科学 环境化学 呼吸 植物 土壤科学 生物 有机化学 法学 热解 政治学
作者
Yuan Tang,Weichang Gao,Kaiyong Cai,Yi Chen,Caibin Li,Xinqing Lee,Hongguang Cheng,Qinghai Zhang,Cheng Jin
出处
期刊:Geoderma [Elsevier BV]
卷期号:385: 114895-114895 被引量:17
标识
DOI:10.1016/j.geoderma.2020.114895
摘要

Knowledge about the influence of tobacco biochar (BC) on soil carbon dioxide (CO2) emissions and carbon (C) budget in a karst region of southwest China is limited. The karst field experiment was conducted in randomly arranged plots and evaluated five treatments: a plot without BC addition (B0), with 1.0 t BC ha−1 (B1C1), 10 t BC ha−1 (B10C10), 25 t BC ha−1 (B25C25) and 50 t BC ha−1 (B50C50). Soil CO2 emissions were assessed using closed chambers at 10-day intervals during a tobacco-growing season. Soil temperature and moisture were simultaneously measured at 5-, 10-, and 20-cm depths. BC amendment increased tobacco productivity, soil organic matter, total nitrogen, available phosphorus, and available potassium contents but decreased total sulfur content. Compared with the control (B0), daily average soil CO2 fluxes significantly increased by 20.0%, 26.3%, 39.4% and 50.2% in the B1, B10, B25, and B50 treatments, respectively. The cumulative soil CO2 emissions for the entire tobacco-growing season were significantly higher in BC amendments than in the control. Furthermore, soil CO2 fluxes were observed to be positively correlated with soil temperature but negatively correlated with soil moisture. Soil respiration sensitivity to temperature (Q10) significantly increased at greater soil depths, whereas decreased in BC-amended soils. Moreover, the BC amendments significantly increased C gain from −1.17 t ha−1 in the B0 treatment to 19.48 t ha−1 in the B50 treatment. Based on C budget, the increase in CO2 emissions in the BC-treated soil was compensated by the higher tobacco biomass and soil C storages. These results suggest that the application of tobacco BC to karst farmland enhances the soil C sequestration.
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