Spatial variation in soil inorganic nitrogen across an arid urban ecosystem

被引：35

作者：

Hope D. ^{[1
]}

Zhu W. ^{[2
]}

Gries C. ^{[1
]}

Oleson J. ^{[3
]}

Kaye J. ^{[4
]}

Grimm N.B. ^{[4
]}

Baker L.A. ^{[5
]}

机构：

[1] International Institute for Sustainability, Arizona State University, Tempe

[2] Biological Sciences, SUNY, Binghamton

[3] Department of Math and Statistics, ASU, Box 871804

[4] School of Life Sciences, ASU, Box 874501, Tempe

[5] Minnesota Water Resources Center, 173 McNeal Hall, St. Paul, MN 55108

来源：

Urban Ecosystems | 2005年 / 8卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

CAP LTER; Desert; Integrated inventory; Soil NH [!sub]4[!/sub]-N; Soil NO [!sub]3[!/sub]-N-N; Spatial autocorrelation; Urban ecosystem;

D O I：

10.1007/s11252-005-3261-9

中图分类号：

学科分类号：

摘要：

We explored variations in inorganic soil nitrogen (N) concentrations across metropolitan Phoenix, Arizona, and the surrounding desert using a probability-based synoptic survey. Data were examined using spatial statistics on the entire region, as well as for the desert and urban sites separately. Concentrations of both NO 3-N and NH 4-N were markedly higher and more heterogeneous amongst urban compared to desert soils. Regional variation in soil NO 3-N concentration was best explained by latitude, land use history, population density, along with percent cover of impervious surfaces and lawn, whereas soil NH 4-N concentrations were related to only latitude and population density. Within the urban area, patterns in both soil NO 3-N and NH 4-N were best predicted by elevation, population density and type of irrigation in the surrounding neighborhood. Spatial autocorrelation of soil NO 3-N concentrations explained 49% of variation among desert sites but was absent between urban sites. We suggest that inorganic soil N concentrations are controlled by a number of 'local' or 'neighborhood' human-related drivers in the city, rather than factors related to an urban-rural gradient. © 2005 Springer Science + Business Media, Inc.

引用

页码：251 / 273

页数：22

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