Nitrogen deposition increases the acquisition of phosphorus and potassium by heather Calluna vulgaris.
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 N/P 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.
Rowe
Edwin C
EC
CEH Bangor, Environment Centre Wales, Bangor, LL57 2UP, UK. ecro@ceh.ac.uk
Smart
Simon M
SM
Kennedy
Valerie H
VH
Emmett
Bridget A
BA
Evans
Christopher D
CD
D029795:Calluna / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D004784:Environmental Monitoring / Q000379:methods; D009584:Nitrogen / Q000494:pharmacology*; D010758:Phosphorus / Q000032:analysis* / Q000378:metabolism; D018520:Plant Shoots / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism; D011188:Potassium / Q000032:analysis* / Q000378:metabolism; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000494:pharmacology*; D006113:United Kingdom
D012987:Soil; D012989:Soil Pollutants; D010758:Phosphorus; D009584:Nitrogen; D011188:Potassium