Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1890/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
![]() |
ISSN | 2150-8925 |
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). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。