Arid
DOI10.1890/ES12-00263.1
Water controls on nitrogen transformations and stocks in an arid ecosystem
Reichmann, Lara G.1,2,3; Sala, Osvaldo E.1,2,3; Peters, Debra P. C.3,4
通讯作者Reichmann, Lara G.
来源期刊ECOSPHERE
ISSN2150-8925
出版年2013
卷号4期号:1
英文摘要

Following water, nitrogen (N) is the most frequent limiting factor to aboveground net primary production in arid ecosystems. Increased water availability can stimulate both plant nitrogen uptake and microbial nitrogen mineralization, but may also stimulate losses from the ecosystem. Here, we assess the effect of water availability on nitrogen stocks and transformations in an arid ecosystem. We conducted a field experiment with five levels of precipitation input (-80%, -50%, ambient, +50%, +80%) and two levels of N fertilization (ambient or 10 g.m(-2).yr(-1) NH4NO3) in a desert grassland of the Chihuahuan Desert. We measured in situ net N mineralization, plant N uptake, foliar N, N leaching under grass-rooting zone, and soil N availability during two years.


Our results showed that increased water availability did not affect net N mineralization, but there was higher plant N uptake than with drought. Soil inorganic N pools were 2-4 times lower with increased water availability compared to drought conditions. N leaching below grass-rooting zone was higher in dry than wet conditions because of higher available N. Increased water availability differentially affected N species significantly reducing the NO3:NH4 ratio. The accumulation of inorganic N during drought was the result of a decoupling between microbial and plant activity, and suggests that the cycling of N is more open in dry years than in wet years.


英文关键词arid ecosystems Chihuahuan Desert net N mineralization nitrogen leaching nitrogen-water interactions soil inorganic N
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000327305900011
WOS关键词NET PRIMARY PRODUCTION ; PRECIPITATION GRADIENT ; LITTER DECOMPOSITION ; PROSOPIS-GLANDULOSA ; BOUTELOUA-GRACILIS ; SOIL RESPIRATION ; PLANT-RESPONSE ; MINERALIZATION ; DYNAMICS ; AVAILABILITY
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构Arizona State University ; New Mexico State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/176779
作者单位1.Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA;
2.Arizona State Univ, Sch Sustainabil, Tempe, AZ 85287 USA;
3.New Mexico State Univ, Jornada Basin Long Term Ecol Res Program, Las Cruces, NM 88003 USA;
4.USDA ARS, NMSU, Las Cruces, NM 88003 USA
推荐引用方式
GB/T 7714
Reichmann, Lara G.,Sala, Osvaldo E.,Peters, Debra P. C.. Water controls on nitrogen transformations and stocks in an arid ecosystem[J]. Arizona State University, New Mexico State University,2013,4(1).
APA Reichmann, Lara G.,Sala, Osvaldo E.,&Peters, Debra P. C..(2013).Water controls on nitrogen transformations and stocks in an arid ecosystem.ECOSPHERE,4(1).
MLA Reichmann, Lara G.,et al."Water controls on nitrogen transformations and stocks in an arid ecosystem".ECOSPHERE 4.1(2013).
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