气候变化领域集成服务门户(CCPortal): Pyrolysis temperature and soil depth interactions determine PyC turnover and induced soil organic carbon priming

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DOI	10.1007/s10533-021-00767-x
	Pyrolysis temperature and soil depth interactions determine PyC turnover and induced soil organic carbon priming
	Santos F.; Rice D.M.; Bird J.A.; Berhe A.A.
发表日期	2021
ISSN	1682563
起始页码	47
结束页码	65
卷号	153 期号:1
英文摘要	Pyrogenic organic carbon (PyC) is a complex, heterogeneous class of thermally altered organic substrates, but its dynamics and how its behavior changes with soil depth remain poorly understood. We conducted a laboratory incubation study to investigate the interactive effects of pyrolysis temperature and soil depth on the turnover of PyC compared to its precursor wood and native SOC (NSOC). We incubated dual-labeled (13C and 15N) jack pine pyrogenic organic matter produced at 300 °C (PyC300), 450 °C (PyC450), and their precursor pine wood in a fine-loamy, mixed-conifer forest soil for 745 days. A mixture of surface (0–10 cm) and subsurface (50–70 cm) forest soils, with and without labeled biomass were incubated in the dark at 55% soil water field capacity and 25 °C. Total 13C from PyC and wood mineralized as 13C-CO2 (as % of C added to soil) declined with an increase in pyrolysis temperature as follows: 54 ± 7.7% for wood, 3.1 ± 0.2% for PyC300, and 0.94 ± 0.08% for PyC450. After 2 years, soil depth interacted with pyrolysis temperature to affect C turnover, with total wood C losses significantly declining from 70.6% in surface soils to 37.5% in subsurface soil, while total losses of PyC300 and PyC450 were unaffected by differences between surface and subsurface soils. Wood induced negative priming (i.e., decreased mineralization rates) in surface soil at days 3 and 60, while PyC300 induced positive priming (i.e., increased mineralization rates) in subsurface soil at day 60. After 2 years, unlabeled NSOC losses increased from 9.2 ± 0.8% of NSOC in unamended treatments to 16.5 ± 2.6% of NSOC with PyC450 additions. Our results suggest that PyC pyrolyzed at a given temperature can mineralize at similar rates between soil depths, and high amounts of PyC450 in subsurface soils can stimulate NSOC losses. These findings indicate that soil depth imposes critical controls on PyC dynamics belowground. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG part of Springer Nature.
英文关键词	13C-labeling; Pine wood; Priming; Pyrogenic carbon; Pyrolysis temperature; Soil depth
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184616
作者单位	Department of Life and Environmental Sciences, University of California-Merced, Merced, CA, United States; School of Natural Sciences, University of California-Merced, Merced, CA, United States; School of Earth and Environmental Sciences, Queens College, City University of New York, Flushing, NY, United States; Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States
推荐引用方式 GB/T 7714	Santos F.,Rice D.M.,Bird J.A.,et al. Pyrolysis temperature and soil depth interactions determine PyC turnover and induced soil organic carbon priming[J],2021,153(1).
APA	Santos F.,Rice D.M.,Bird J.A.,&Berhe A.A..(2021).Pyrolysis temperature and soil depth interactions determine PyC turnover and induced soil organic carbon priming.Biogeochemistry,153(1).
MLA	Santos F.,et al."Pyrolysis temperature and soil depth interactions determine PyC turnover and induced soil organic carbon priming".Biogeochemistry 153.1(2021).