Arid
DOI10.1007/s11252-016-0538-0
Contrasting soil nitrogen dynamics across a montane meadow and urban lawn in a semi-arid watershed
Hall, Steven J.1,2; Baker, Michelle A.3,4; Jones, Scott B.5; Stark, John M.3,4; Bowling, David R.1,6
通讯作者Hall, Steven J.
来源期刊URBAN ECOSYSTEMS
ISSN1083-8155
EISSN1573-1642
出版年2016
卷号19期号:3页码:1083-1101
英文摘要

Urbanization substantially increases nitrogen (N) inputs and hydrologic losses relative to wildland ecosystems, although the fate of N additions to lawns and remnant grasslands remains contested. In montane semi-arid ecosystems, N cycling is often closely coupled to snowmelt (the dominant period of infiltration) and snow cover, which impact soil temperature and moisture. Here, we compared soil N dynamics between a fertilized and irrigated urban lawn and nearby riparian meadow in Salt Lake City, Utah during a snow manipulation experiment. Snow removal increased freeze/thaw events but did not affect N pools, microbial biomass, denitrification potential, or soil oxygen (O-2). Mineral N was similar between sites despite lawn fertilization, but dissolved organic N (DON) was four-fold greater (2.1 +/- A 0.1 mg N l(-1)) in lawn soil water. Infiltration was lower in the lawn subsoil, and leaching losses (modeled with Hydrus) were small at both sites (< 2 kg N ha(-1) y(-1)) despite substantial lawn fertilization. Lawn soil O-2 fluctuated between 20.9 and 1.6 % following snowmelt and irrigation, but remained near 20 % in the meadow; the lawn had more reducing microsites as indicated by iron speciation. Post-snowmelt potential denitrification was six-fold greater in the lawn than the meadow. Lawns can potentially provide hotspots of denitrification in a semi-arid landscape that exceed some natural riparian ecosystems, whereas DON may represent an increasingly important form of N loss from lawns.


英文关键词Denitrification Dissolved organic nitrogen Lawn Nitrogen leaching Snowmelt Soil oxygen
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000382670600004
WOS关键词CLIMATE-CHANGE ; CARBON ; DENITRIFICATION ; FLUXES ; EXPORT ; CYCLE ; TERRESTRIAL ; PHOSPHORUS ; RETENTION
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences ; Urban Studies
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology ; Urban Studies
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/196739
作者单位1.Univ Utah, Global Change & Sustainabil Ctr, Salt Lake City, UT 84112 USA;
2.Iowa State Univ, Dept Ecol Evolut & Organismal Biol, 251 Bessey Hall, Ames, IA 50011 USA;
3.Utah State Univ, Dept Biol, Logan, UT 84322 USA;
4.Utah State Univ, Ctr Ecol, Logan, UT 84322 USA;
5.Utah State Univ, Dept Plants Soils & Climate, Logan, UT 84322 USA;
6.Univ Utah, Dept Biol, Salt Lake City, UT 84112 USA
推荐引用方式
GB/T 7714
Hall, Steven J.,Baker, Michelle A.,Jones, Scott B.,et al. Contrasting soil nitrogen dynamics across a montane meadow and urban lawn in a semi-arid watershed[J],2016,19(3):1083-1101.
APA Hall, Steven J.,Baker, Michelle A.,Jones, Scott B.,Stark, John M.,&Bowling, David R..(2016).Contrasting soil nitrogen dynamics across a montane meadow and urban lawn in a semi-arid watershed.URBAN ECOSYSTEMS,19(3),1083-1101.
MLA Hall, Steven J.,et al."Contrasting soil nitrogen dynamics across a montane meadow and urban lawn in a semi-arid watershed".URBAN ECOSYSTEMS 19.3(2016):1083-1101.
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