气候变化领域集成服务门户(CCPortal): Continental-scale patterns of extracellular enzyme activity in the subsoil: An overlooked reservoir of microbial activity

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DOI	10.1088/1748-9326/abb0b3
	Continental-scale patterns of extracellular enzyme activity in the subsoil: An overlooked reservoir of microbial activity
	Dove N.C.; Arogyaswamy K.; Billings S.A.; Botthoff J.K.; Carey C.J.; Cisco C.; Deforest J.L.; Fairbanks D.; Fierer N.; Gallery R.E.; Kaye J.P.; Lohse K.A.; Maltz M.R.; Mayorga E.; Pett-Ridge J.; Yang W.H.; Hart S.C.; Aronson E.L.
发表日期	2020
ISSN	17489318
卷号	15 期号:10
英文摘要	Chemical stabilization of microbial-derived products such as extracellular enzymes (EE) onto mineral surfaces has gained attention as a possibly important mechanism leading to the persistence of soil organic carbon (SOC). While the controls on EE activities and their stabilization in the surface soil are reasonably well-understood, how these activities change with soil depth and possibly diverge from those at the soil surface due to distinct physical, chemical, and biotic conditions remains unclear. We assessed EE activity to a depth of 1 m (10 cm increments) in 19 soil profiles across the Critical Zone Observatory Network, which represents a wide range of climates, soil orders, and vegetation types. For all EEs, activities per mass of soil correlated positively with microbial biomass (MB) and SOC, and all three of these variables decreased logarithmically with depth (p < 0.05). Across all sites, over half of the potential EE activities per mass soil consistently occurred below 20 cm for all measured EEs. Activities per unit MB or SOC were substantially higher at depth (soils below 20 cm accounted for 80% of whole-profile EE activity), suggesting an accumulation of stabilized (i.e. mineral sorbed) EEs in subsoil horizons. The pronounced enzyme stabilization in subsurface horizons was corroborated by mixed-effects models that showed a significant, positive relationship between clay concentration and MB-normalized EE activities in the subsoil. Furthermore, the negative relationships between soil C, N, and P and C-, N-, and P-acquiring EEs found in the surface soil decoupled below 20 cm, which could have also been caused by EE stabilization. This finding suggests that EEs may not reflect soil nutrient availabilities deeper in the soil profile. Taken together, our results suggest that deeper soil horizons hold a significant reservoir of EEs, and that the controls of subsoil EEs differ from their surface soil counterparts. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	a-glucosidase; acid phosphatase; critical zone; ecological stoichiometry; extracellular enzymes; microbial ecology; N-acetylglucosaminidase; phospholipid fatty acids; subsoil
语种	英语
scopus关键词	Enzyme activity; Organic carbon; Soil pollution; Soils; Chemical stabilization; Clay concentration; Enzyme stabilization; Extracellular enzyme activity; Extracellular enzymes; Microbial activities; Mixed effects models; Soil organic carbon; Stabilization; clay soil; enzyme; enzyme activity; microbial activity; nutrient availability; organic carbon; physicochemical property; reservoir; soil carbon; soil depth; soil horizon; soil nutrient; soil surface; soil-vegetation interaction; subsoil
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153555
作者单位	Environmental Systems Graduate Group, University of California, Merced, CA, United States; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States; Department of Microbiology and Plant Pathology, University of California, Riverside, CA, United States; Department of Ecology and Evolutionary Biology, Kansas Biological Survey, University of Kansas, Lawrence, KS, United States; Center for Conservation Biology, University of California, Riverside, CA, United States; Point Blue Conservation Science, Cypress Drive, Suite 11, Petaluma, CA 3820, United States; Department of Plant Biology, University of Illinois, Urbana, IL, United States; Department of Environmental and Plant Biology, Ohio University, Athens, OH, United States; Department of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ, United States; Cooperative Institute for Research in Environmental Sciences, Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, United States;...
推荐引用方式 GB/T 7714	Dove N.C.,Arogyaswamy K.,Billings S.A.,et al. Continental-scale patterns of extracellular enzyme activity in the subsoil: An overlooked reservoir of microbial activity[J],2020,15(10).
APA	Dove N.C..,Arogyaswamy K..,Billings S.A..,Botthoff J.K..,Carey C.J..,...&Aronson E.L..(2020).Continental-scale patterns of extracellular enzyme activity in the subsoil: An overlooked reservoir of microbial activity.Environmental Research Letters,15(10).
MLA	Dove N.C.,et al."Continental-scale patterns of extracellular enzyme activity in the subsoil: An overlooked reservoir of microbial activity".Environmental Research Letters 15.10(2020).