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Field-scale fluorescence fingerprinting of biochar-borne dissolved organic carbon

文献类型： 外文期刊

作者： Uchimiya, Minori 1 ; Liu, Zhongzhen 1 ; Sistani, Karamat 3 ;

作者机构： 1.USDA ARS, So Reg Res Ctr, 1100 Robert E Lee Blvd, New Orleans, LA 70124 USA

2.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou, Guangdong, Peoples R China

3.USDA ARS, Food Anim Environm Syst Res Unit, 2413 Nashville Rd B-5, Bowling Green, KY 42101 USA

关键词： Pyrolysis;Biomass;Thermal conversion;Volatile matter;Soil amendment

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：6.789； 五年影响因子：6.914 ）

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收录情况： SCI

摘要： Biochar continues to receive worldwide enthusiasm as means of augmenting recalcitrant organic carbon in agricultural soils. Realistic biochar amendment rate (typically less than 1 wt%) in the field scale, and subsequent loss by sizing, rain, and other transport events demand reliable methods to quantify the remaining portions of amended biochar. This study employed fluorescence excitation-emission (EEM) spectrophotometry and parallel factor analysis (PARAFAC) to specifically target pyrogenic dissolved organic carbon (DOC) released by amended biochar during the course of a field trial at Bowling Green, KY experimental site. Toluene/methanol (1:6 v/v) extracts of surface (0-15 cm) soils amended with 21.28 t ha(-1) fast pyrolysis biochar afforded PARAFAC fingerprints representing different degrees of aromaticity. Compared to the control without treatments, biochar treatment (with and without poultry manure or chemical fertilizer) increased the relative contribution of PARAFAC fingerprint attributable to labile polyaromatic DOC structures. Poultry manure or chemical fertilizer alone (without biochar) did not influence the amounts of polyaromatic DOC structures. Existence of biochar could be further validated by the changes in %DOC (relative to the total carbon), fixed C content, and UV absorbance (360 nm), whereas FTIR, %O, and sorption of model agrochemical (deisopropylatrazine) did not reflect the presence of biochar in the soil samples. Developed toluene/methanol-based EEM-PARAFAC technique will provide a sensitive, rapid, and cost-competitive method to validate the long-term carbon sequestration by the biochar soil amendment. Published by Elsevier Ltd.

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