Arid
DOI10.1016/j.envpol.2018.04.013
Mixed method approach to assess atmospheric nitrogen deposition in arid and semi-arid ecosystems
Cook, Elizabeth M.1; Sponseller, Ryan2; Grimm, Nancy B.1,3; Hall, Sharon J.1,3
通讯作者Cook, Elizabeth M.
来源期刊ENVIRONMENTAL POLLUTION
ISSN0269-7491
EISSN1873-6424
出版年2018
卷号239页码:617-630
英文摘要

Arid and semi-arid ecosystems (aridlands) cover a third of Earth’s terrestrial surface and contain organisms that are sensitive to low level atmospheric pollutants. Atmospheric nitrogen (N) inputs to aridlands are likely to cause changes in plant community composition, fire frequency, and carbon cycling and storage. However, few studies have documented long-term rates of atmospheric N inputs in arid-lands because dry deposition is technically difficult to quantify, and extensive sampling is needed to capture fluxes with spatially and temporally heterogeneous rainfall patterns. Here, we quantified long-term spatial and temporal patterns of inorganic N deposition in protected aridland ecosystems across an extensive urban-rural gradient using multiple sampling methods. We compared long-term rates of N deposition from ion-exchange resin (IER) collectors (bulk and throughfall, 2006-2015), wet-dry bucket collectors (2006-2015), and dry deposition from the inferential method using passive samplers (2010-2012). From mixed approaches with IER collectors and inferential methods, we determined that 7.2 +/- 0.4 kgNha(-1)y(-1) is deposited to protected Sonoran Desert within metropolitan Phoenix, Arizona and 6.1 +/- 0.3 kgNha(-1)y(-1) in nearby desert ecosystems. Regional scale models overestimated deposition rates for our sampling period by 60% and misidentified hot spots of deposition across the airshed. By contrast, the easy-deployment IER throughfall collectors showed minimal spatial variation across the urban-rural gradient and underestimated deposition fluxes by 54%, largely because of underestimated dry deposition in throughfall. However, seasonal sampling of the IER collectors over 10 years allowed us to capture significant seasonal variation in N deposition and the importance of precipitation timing. These results, derived from the longest, spatially and temporally explicit dataset in drylands, highlight the need for long-term, mixed methods to estimate atmospheric nutrient enrichment to aridlands in a rapidly changing world. (C) 2018 Elsevier Ltd. All rights reserved.


英文关键词Inorganic nitrogen deposition Aridland ecosystems Dry deposition Urban-rural gradient
类型Article
语种英语
国家USA ; Sweden
收录类别SCI-E
WOS记录号WOS:000434744800064
WOS关键词GASEOUS AMMONIA CONCENTRATIONS ; SAN-BERNARDINO MOUNTAINS ; UNITED-STATES ; DRY DEPOSITION ; INORGANIC NITROGEN ; FOREST ECOSYSTEMS ; CHIHUAHUAN DESERT ; AIR-POLLUTION ; NITRIC-ACID ; URBAN
WOS类目Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
来源机构Arizona State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/209081
作者单位1.Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA;
2.Umed Univ, Dept Ecol & Environm Sci, Umed, Sweden;
3.Arizona State Univ, Julie Ann Wrigley Global Inst Sustainabil, Tempe, AZ 85287 USA
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GB/T 7714
Cook, Elizabeth M.,Sponseller, Ryan,Grimm, Nancy B.,et al. Mixed method approach to assess atmospheric nitrogen deposition in arid and semi-arid ecosystems[J]. Arizona State University,2018,239:617-630.
APA Cook, Elizabeth M.,Sponseller, Ryan,Grimm, Nancy B.,&Hall, Sharon J..(2018).Mixed method approach to assess atmospheric nitrogen deposition in arid and semi-arid ecosystems.ENVIRONMENTAL POLLUTION,239,617-630.
MLA Cook, Elizabeth M.,et al."Mixed method approach to assess atmospheric nitrogen deposition in arid and semi-arid ecosystems".ENVIRONMENTAL POLLUTION 239(2018):617-630.
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