globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13507
论文题名:
Acidity and organic matter promote abiotic nitric oxide production in drying soils
作者: Homyak P.M.; Kamiyama M.; Sickman J.O.; Schimel J.P.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:4
起始页码: 1735
结束页码: 1747
语种: 英语
英文关键词: chemodenitrification ; drylands ; N cycling ; nitric oxide ; NO pulses ; wet up
英文摘要: Soils are an important source of NO, particularly in dry lands because of trade-offs that develop between biotic and abiotic NO-producing processes when soils dry out. Understanding how drier climates may offset the balance of these trade-offs as soils transition toward more arid states is, therefore, critical to estimating global NO budgets, especially because drylands are expected to increase in size. We measured NO emission pulses after wetting soils from similar lithologies along an altitudinal gradient in the Sierra Nevada, CA, where mean annual precipitation varied from 670 to 1500 mm. Along the gradient, we measured field NO emissions, and used chloroform in the laboratory to reduce microbial activity and partition between biotic and abiotic NO-producing processes (i.e., chemodenitrification). Field NO emission pulses were lowest in the acidic and SOM-rich soils (4–72 ng NO-N m−2 s−1), but were highest in the high-elevation barren site (~560 ng NO-N m−2 s−1). In the laboratory, NO emission pulses were up to 19× greater in chloroform-treated soils than in the controls, and these abiotic pulses increased with elevation as pH decreased (6.2–4.4) and soil organic matter (SOM) increased (18–157 mg C g−1). Drought can shift the balance between the biotic and abiotic processes that produce NO, favoring chemodenitrification during periods when biological processes become stressed. Acidic and SOM-rich soils, which typically develop under mesic conditions, are most vulnerable to N loss via NO as interactions between pH, SOM, and drought stimulate chemodenitrification. © 2016 John Wiley & Sons Ltd
资助项目: We are thankful to Eddie Dominguez and Krystal Vasquez for help during laboratory analyses, to Mike Law and Kevin Skeen for assistance in the field, and to Annie Esperanza and NPS staff for facilitating access to the study sites. Special thanks to Sonja Leitner for critical comments on an earlier version of this manuscript. This research was funded by the National Science Foundation (postdoctoral fellowship to P.M.H (DBI-1202894), DEB-1145875, and DEB-0614207) and the University of California at Santa Barbara and Riverside.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61011
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Ecology, Evolution and Marine Biology, Earth Research Institute, University of California, Santa Barbara, CA, United States; Department of Environmental Sciences, University of California, Riverside, CA, United States

Recommended Citation:
Homyak P.M.,Kamiyama M.,Sickman J.O.,et al. Acidity and organic matter promote abiotic nitric oxide production in drying soils[J]. Global Change Biology,2017-01-01,23(4)
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