气候变化领域集成服务门户(CCPortal): Controls and significance of priming effects in lake sediments

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DOI	10.1111/gcb.17076
	Controls and significance of priming effects in lake sediments
	Bartosiewicz, Maciej; Przytulska, Anna; Birkholz, Axel; Zopfi, Jakob; Lehmann, Moritz F.
发表日期	2024
ISSN	1354-1013
EISSN	1365-2486
起始页码	30
结束页码	1
卷号	30 期号:1
英文摘要	Warming and eutrophication influence carbon (C) processing in sediments, with implications for the global greenhouse-gas budget. Temperature effects on sedimentary C loss are well understood, but the mechanism of change in turnover through priming with labile organic matter (OM) is not. Evaluating changes in the magnitude of priming as a function of warming, eutrophication, and OM stoichiometry, we incubated sediments with C-13-labeled fresh organic matter (FOM, algal/cyanobacterial) and simulated future climate scenarios (+4 degrees C and +8 degrees C). We investigated FOM-induced production of CH4 and microbial community changes. C loss was primed by up to 17% in dominantly allochthonous sediments (ranging from 5% to 17%), compared to up to 6% in autochthonous sediments (-9% to 6%), suggesting that refractory OM is more susceptible to priming. The magnitude of priming was dependent on sediment OM stoichiometry (C/N ratio), the ratio of fresh labile OM to microbial biomass (FOM/MB), and temperature. Priming was strongest at 4 degrees C when FOM/MB was below 50%. Addition of FOM was associated with activation and growth of bacterial decomposers, including for example, Firmicutes, Bacteroidetes, or Fibrobacteres, known for their potential to degrade insoluble and complex structural biopolymers. Using sedimentary C/N > 15 as a threshold, we show that in up to 35% of global lakes, sedimentation is dominated by allochthonous rather than autochthonous material. We then provide first-order estimates showing that, upon increase in phytoplankton biomass in these lakes, priming-enabled degradation of recalcitrant OM will release up to 2.1 Tg C annually, which would otherwise be buried for geological times.
英文关键词	climate change eutrophication; cyanobacteria; lake carbon; methanogenesis; priming effects; sediments stoichiometry
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS记录号	WOS:001128208700001
来源期刊	GLOBAL CHANGE BIOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/301301
作者单位	University of Basel; Polish Academy of Sciences; Institute of Geophysics of the Polish Academy of Sciences
推荐引用方式 GB/T 7714	Bartosiewicz, Maciej,Przytulska, Anna,Birkholz, Axel,et al. Controls and significance of priming effects in lake sediments[J],2024,30(1).
APA	Bartosiewicz, Maciej,Przytulska, Anna,Birkholz, Axel,Zopfi, Jakob,&Lehmann, Moritz F..(2024).Controls and significance of priming effects in lake sediments.GLOBAL CHANGE BIOLOGY,30(1).
MLA	Bartosiewicz, Maciej,et al."Controls and significance of priming effects in lake sediments".GLOBAL CHANGE BIOLOGY 30.1(2024).