DOI: 10.1007/s10533-014-9966-1
Scopus记录号: 2-s2.0-84900798431
论文题名: Stable nitrogen isotope patterns of trees and soils altered by long-term nitrogen and phosphorus addition to a lowland tropical rainforest
作者: Mayor J.R. ; Wright S.J. ; Schuur E.A.G. ; Brooks M.E. ; Turner B.L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 119, 期: 2018-01-03 起始页码: 293
结束页码: 306
语种: 英语
英文关键词: Ecosystem ecology
; Gigante Fertilization Experiment
; Mass balance mixing models
; Panama
; Stoichiometry
Scopus关键词: foliage
; long-term change
; mass balance
; mixing
; nitrogen cycle
; nitrogen isotope
; phosphorus
; rainforest
; soil nitrogen
; stable isotope
; stoichiometry
; tropical forest
; Panama [Central America]
英文摘要: Foliar nitrogen (N) isotope ratios (δ15N) are used as a proxy for N-cycling processes, including the "openness" of the N cycle and the use of distinct N sources, but there is little experimental support for such proxies in lowland tropical forest. To address this, we examined the δ15N values of soluble soil N and canopy foliage of four tree species after 13 years of factorial N and P addition to a mature lowland rainforest. We hypothesized that N addition would lead to 15N-enriched soil N forms due to fractionating losses, whereas P addition would reduce N losses as the plants and microbes adjusted their stoichiometric demands. Chronic N addition increased the concentration and δ15N value of soil nitrate and δ15N in live and senesced leaves in two of four tree species, but did not affect ammonium or dissolved organic N. Phosphorus addition significantly increased foliar δ15N in one tree species and elicited significant N × P interactions in two others due to a reduction in foliar δ15N enrichment under N and P co-addition. Isotope mixing models indicated that three of four tree species increased their use of nitrate relative to ammonium following N addition, supporting the expectation that tropical trees use the most available form of mineral N. Previous observations that anthropogenic N deposition in this tropical region have led to increasing foliar δ15N values over decadal time-scales is now mechanistically linked to greater usage of 15N-enriched nitrate. © 2014 Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83680
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Smithsonian Tropical Research Institute, Apartado 0843-03092, Balboa, Ancon, Panama; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden; Department of Biology, University of Florida, Gainesville, FL, 32611, United States; Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland
Recommended Citation:
Mayor J.R.,Wright S.J.,Schuur E.A.G.,et al. Stable nitrogen isotope patterns of trees and soils altered by long-term nitrogen and phosphorus addition to a lowland tropical rainforest[J]. Biogeochemistry,2014-01-01,119(2018-01-03)