期刊
ENVIRONMENTAL POLLUTION
卷 155, 期 2, 页码 201-207出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2007.12.008
关键词
heathland; limitation; nutrient; saturation; sequestration
资金
- Natural Environment Research Council [ceh010023] Funding Source: researchfish
Increased plant productivity due to nitrogen pollution increases the strength of the global carbon sink, but is implicated in plant diversity loss. However, modelling and experimental studies have suggested that these effects are constrained by availability of other nutrients. In a survey of element concentrations in Calluna vulgaris across an N deposition gradient in the UK, shoot concentrations of N and more surprisingly phosphorus and potassium were positively correlated with N deposition; tissue NIP ratio even decreased with N deposition. Elevated P and K concentrations possibly resulted from improved acquisition due to additional enzyme production or mycorrhizal activity. Heather occurs on organic soils where nutrient limitations are likely due to availability constraints rather than small stocks. However, if this effect extends to other plant and soil types, effects of N deposition on C sinks and plant competition may not be as constrained by availability of other nutrients as previously proposed. (c) 2007 Elsevier Ltd. All rights reserved.
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