DOI: 10.1073/pnas.0711411105
论文题名: Evolutionary tradeoffs can select against nitrogen fixation and thereby maintain nitrogen limitation
作者: Menge D.N.L. ; Levin S.A. ; Hedin L.O.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2008
卷: 105, 期: 5 起始页码: 1573
结束页码: 1578
语种: 英语
英文关键词: Evolutionary ecology
; Model
Scopus关键词: article
; ecology
; ecosystem
; evolution
; model
; nitrogen fixation
; plant metabolism
; priority journal
; biological model
; ecosystem
; genetic selection
; genetics
; metabolism
; tree
; nitrogen
; Ecosystem
; Evolution
; Models, Biological
; Nitrogen
; Nitrogen Fixation
; Selection (Genetics)
; Trees
英文摘要: Symbiotic nitrogen (N) fixing trees are absent from old-growth temperate and boreal ecosystems, even though many of these are N-limited. To explore mechanisms that could select against N fixation in N-limited, old-growth ecosystems, we developed a simple resource-based evolutionary model of N fixation. When there are no costs of N fixation, increasing amounts of N fixation will be selected for until N no longer limits production. However, tradeoffs between N fixation and plant mortality or turnover, plant uptake of available soil N, or N use efficiency (NUE) can select against N fixation in N-limited ecosystems and can thereby maintain N limitation indefinitely (provided that there are losses of plant-unavailable N). Three key traits influence the threshold that determines how large these tradeoffs must be to select against N fixation. A low NUE, high mortality (or turnover) rate and low losses of plant-unavailable N all increase the likelihood that N fixation will be selected against, and a preliminary examination of published data on these parameters shows that these mechanisms, particularly the tradeoff with NUE, are quite feasible in some systems. Although these results are promising, a better characterization of these parameters in multiple ecosystems is necessary to determine whether these mechanisms explain the lack of symbiotic N fixers - and thus the maintenance of N limitation - in old-growth forests. © 2008 by The National Academy of Sciences of the USA. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162464
Appears in Collections: 气候变化与战略
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作者单位: Menge, D.N.L., Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, United States; Levin, S.A., Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, United States; Hedin, L.O., Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, United States
Recommended Citation:
Menge D.N.L.,Levin S.A.,Hedin L.O.. Evolutionary tradeoffs can select against nitrogen fixation and thereby maintain nitrogen limitation[J]. Proceedings of the National Academy of Sciences of the United States of America,2008-01-01,105(5)