Arid
DOI10.1007/s00442-002-1130-2
Responses of soil nitrogen dynamics in a Mojave Desert ecosystem to manipulations in soil carbon and nitrogen availability
Schaeffer, SM; Billings, SA; Evans, RD
通讯作者Schaeffer, SM
来源期刊OECOLOGIA
ISSN0029-8549
出版年2003
卷号134期号:4页码:547-553
英文摘要

We investigated the effects of changes in soil C and N availability on N mineralization, nitrification, denitrification, NH3 volatilization, and soil respiration in the Mojave Desert. Results indicate a C limitation to microbial N cycling. Soils from underneath the canopies of Larrea tridentata (DC.) Cov., Pleuraphis rigida Thurber, and Lycium spp. exhibited higher rates of CO2 flux, lower rates of NH3 volatilization, and a decrease in inorganic N (NH4+-N and NO3--N) with C addition. In addition to C limitation, soils from plant interspaces also exhibited a N limitation. Soils from all locations had net immobilization of N over the course of a 15-day laboratory incubation. However, soils from interspaces had lower rates of net nitrification and potential denitrification compared to soils from under plant canopies. The response to changes in C availability appears to be a short-term increase in microbial immobilization of inorganic N. Under controlled conditions, and over a longer time period, the effects of C and N availability appear to give way to larger differences due to spatial location. These findings have implications for ecosystems undergoing changes in soil C and N availability due to such processes as desertification, exotic species invasions, or elevated atmospheric CO2 concentration.


英文关键词ammonia volatilization denitrification microbial activity mineralization soil respiration
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000181582700012
WOS关键词SHRUB-STEPPE ECOSYSTEM ; NORTHERN CHIHUAHUAN DESERT ; ELEVATED ATMOSPHERIC CO2 ; MICROBIAL BIOMASS ; HARDWOOD FOREST ; DENITRIFICATION ; IMMOBILIZATION ; GRASSLAND ; OXIDE ; LIMITATIONS
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/145534
作者单位(1)Univ Arkansas, Stable Isotope Lab, Fayetteville, AR 72701 USA
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Schaeffer, SM,Billings, SA,Evans, RD. Responses of soil nitrogen dynamics in a Mojave Desert ecosystem to manipulations in soil carbon and nitrogen availability[J],2003,134(4):547-553.
APA Schaeffer, SM,Billings, SA,&Evans, RD.(2003).Responses of soil nitrogen dynamics in a Mojave Desert ecosystem to manipulations in soil carbon and nitrogen availability.OECOLOGIA,134(4),547-553.
MLA Schaeffer, SM,et al."Responses of soil nitrogen dynamics in a Mojave Desert ecosystem to manipulations in soil carbon and nitrogen availability".OECOLOGIA 134.4(2003):547-553.
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