Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13507 |
Acidity and organic matter promote abiotic nitric oxide production in drying soils | |
Homyak, Peter M.1; Kamiyama, Matthew2; Sickman, James O.2; Schimel, Joshua P.1 | |
2017-04-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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 (similar to 560 ng NO-N m(-2) s(-1)). In the laboratory, NO emission pulses were up to 199 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. |
英文关键词 | chemodenitrification drylands N cycling nitric oxide NO pulses wet up |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396836800030 |
WOS关键词 | NITRIFICATION RATES ; NITROGEN DEPOSITION ; BIOCIDAL TREATMENTS ; SIERRA-NEVADA ; FOREST SOILS ; TRANSFORMATIONS ; EMISSIONS ; CARBON ; WATER ; METABOLISM |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17363 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Univ Calif Santa Barbara, Earth Res Inst, Dept Ecol Evolut & Marine Biol, Santa Barbara, CA 93106 USA; 2.Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA |
推荐引用方式 GB/T 7714 | Homyak, Peter M.,Kamiyama, Matthew,Sickman, James O.,et al. Acidity and organic matter promote abiotic nitric oxide production in drying soils[J]. GLOBAL CHANGE BIOLOGY,2017,23(4). |
APA | Homyak, Peter M.,Kamiyama, Matthew,Sickman, James O.,&Schimel, Joshua P..(2017).Acidity and organic matter promote abiotic nitric oxide production in drying soils.GLOBAL CHANGE BIOLOGY,23(4). |
MLA | Homyak, Peter M.,et al."Acidity and organic matter promote abiotic nitric oxide production in drying soils".GLOBAL CHANGE BIOLOGY 23.4(2017). |
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