Production of hydroxyl radicals following water-level drawdown in peatlands: A new induction mechanism for enhancing laccase activity in carbon cycling

doi:10.1016/j.soilbio.2021.108241

	Production of hydroxyl radicals following water-level drawdown in peatlands: A new induction mechanism for enhancing laccase activity in carbon cycling
	Zhao, Yunpeng 1,2; Xiang, Wu ; Huang, Chunlei 3; Liu, Yang ; Tan, Yu
	2021
发表期刊	SOIL BIOLOGY & BIOCHEMISTRY
ISSN	0038-0717
卷号	156
摘要	The hydroxyl radical (center dot OH) is the most powerful reactive oxygen species that plays a critical role in the fate of redox-active substances. Peatlands are carbon-rich ecosystems with highly reduced substances and ubiquitous redox interfaces. However, little is known about the production of center dot OH during the reoxidation of peatlands under waterlogged conditions. Here, we conduct a set of reoxidation experiments using waterlogged peat soil dominated by various vegetation species and monitored center dot OH production. The results show that the cumulative concentrations of center dot OH produced within 24 h upon oxygenation of waterlogged peat samples are 307-840 mmol g(-1). The main factors affecting the production of center dot OH include an acidic environment, abundant reduced dissolved organic matter and Fe(II). In addition, center dot OH production enhances laccase activity (the largest class of phenol oxidases in the soil) by 7.7% similar to 20.4% and increases soil respiration by 3.17% similar to 23.67% during the reoxidation of the waterlogged peat samples. In addition, the simulation experiments confirm that center dot OH can promote laccase activity directly by serving as an electron acceptor and indirectly by oxidizing substrates. Both mechanisms are greater than the effect of oxygen (O-2) alone on laccase activity. Our results indicate a new induction mechanism for enhancing laccase activity by center dot OH when subjected to anoxic-oxic interface fluctuations, which is particularly important for carbon cycling in peatlands because it can break the decomposition latch and can further promote soil organic carbon mineralization.
关键词	Peatlands Hydroxyl radicals Laccase activity Water-level drawdown Carbon cycling
学科领域	Soil Science
DOI	10.1016/j.soilbio.2021.108241
收录类别	SCI
语种	英语
WOS关键词	DISSOLVED ORGANIC-MATTER ; DARK PRODUCTION ; PHENOL OXIDASE ; IRON ; DECOMPOSITION ; OXIDATION ; SYSTEMS ; SOIL ; FE ; FLUORESCENCE
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000640189100029
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献子类	Article
出版地	OXFORD
EISSN	1879-3428
资助机构	National Natural Science Foundation of China [NSFC 41977263] ; Open Fund of Technical Innovation Center of Agricultural Land Ecological Evaluation and Restoration Engineering in Plain Area, Ministry of Natural Resources of the People's Republic of China [ZJGCJ202002]
作者邮箱	xiangw@cug.edu.cn
引用统计	被引频次：20[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/26641
专题	植被与环境变化国家重点实验室
作者单位	1.China Univ Geosci, Sch Earth Sci, Hubei Key Lab Crit Zone Evolut, Wuhan 430074, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Zhejiang Geol Survey Inst, Hangzhou 311305, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Yunpeng,Xiang, Wu,Huang, Chunlei,et al. Production of hydroxyl radicals following water-level drawdown in peatlands: A new induction mechanism for enhancing laccase activity in carbon cycling[J]. SOIL BIOLOGY & BIOCHEMISTRY,2021,156.
APA	Zhao, Yunpeng,Xiang, Wu,Huang, Chunlei,Liu, Yang,&Tan, Yu.(2021).Production of hydroxyl radicals following water-level drawdown in peatlands: A new induction mechanism for enhancing laccase activity in carbon cycling.SOIL BIOLOGY & BIOCHEMISTRY,156.
MLA	Zhao, Yunpeng,et al."Production of hydroxyl radicals following water-level drawdown in peatlands: A new induction mechanism for enhancing laccase activity in carbon cycling".SOIL BIOLOGY & BIOCHEMISTRY 156(2021).

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