Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s10533-007-9173-4 |
Responses of soil microorganisms to resource availability in urban, desert soils | |
McCrackin, Michelle L.1; Harms, Tamara K.1; Grimm, Nancy B.1![]() | |
通讯作者 | McCrackin, Michelle L. |
来源期刊 | BIOGEOCHEMISTRY
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ISSN | 0168-2563 |
EISSN | 1573-515X |
出版年 | 2008 |
卷号 | 87期号:2页码:143-155 |
英文摘要 | Terrestrial desert ecosystems are strongly structured by the distribution of plants, which concentrate resources and create islands of fertility relative to interplant spaces. Atmospheric nitrogen (N) deposition resulting from urbanization has the potential to change those spatial patterns via resource inputs, resulting in more homogeneous soil resource availability. We sampled soils at 12 desert remnant sites around Phoenix, Arizona along a model-predicted gradient in N deposition to determine the degree to which deposition has altered spatial patterns in soil resource availability and microbial activity. Soil microbial biomass and abundance were not influenced by atmospheric N deposition. Instead, plant islands remained strong organizers of soil microbial processes. These islands of fertility exhibited elevated pools of resources, microbial abundance, and activity relative to interspaces. In both plant islands and interspaces, soil moisture and soil N concentrations predicted microbial biomass and abundance. Following experimental wetting, carbon dioxide (CO2) flux from soil of interspaces was positively correlated with N deposition, whereas in plant islands, soil CO2 flux was positively correlated with soil moisture content and soil organic matter. Soil CO2 flux in both patch types showed rapid and short-lived responses to precipitation, demonstrating the brief time scales during which soil biota may process deposited materials. Although we observed patterns consistent with N limitation of microbes in interspaces, we conclude that atmospheric N deposition likely accumulates in soils because microbes are primarily limited by water and secondarily by carbon or nitrogen. Soil microbial uptake of atmospherically deposited N likely occurs only during sparse and infrequent rainfall. |
英文关键词 | phoenix AZ soil microbes soil respiration islands of fertility atmospheric nitrogen deposition Sonoran Desert |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000254360300003 |
WOS关键词 | NITROGEN DEPOSITION GRADIENT ; NORTHERN HARDWOOD FORESTS ; WESTERN UNITED-STATES ; MICROBIAL BIOMASS ; TEMPERATE FOREST ; DRY DEPOSITION ; SOUTHERN CALIFORNIA ; CHIHUAHUAN DESERT ; ENZYME-ACTIVITIES ; SONORAN DESERT |
WOS类目 | Environmental Sciences ; Geosciences, Multidisciplinary |
WOS研究方向 | Environmental Sciences & Ecology ; Geology |
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/2XILL650/156661 |
作者单位 | 1.Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA; 2.Penn State Univ, Dept Crop & Soil Sci, University Pk, PA 16802 USA |
推荐引用方式 GB/T 7714 | McCrackin, Michelle L.,Harms, Tamara K.,Grimm, Nancy B.,et al. Responses of soil microorganisms to resource availability in urban, desert soils[J]. Arizona State University,2008,87(2):143-155. |
APA | McCrackin, Michelle L.,Harms, Tamara K.,Grimm, Nancy B.,Hall, Sharon J.,&Kaye, Jason P..(2008).Responses of soil microorganisms to resource availability in urban, desert soils.BIOGEOCHEMISTRY,87(2),143-155. |
MLA | McCrackin, Michelle L.,et al."Responses of soil microorganisms to resource availability in urban, desert soils".BIOGEOCHEMISTRY 87.2(2008):143-155. |
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