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Nutrient resorption of two evergreen shrubs in response to long-term fertilization in a bog.
- Source :
-
Oecologia . Feb2014, Vol. 174 Issue 2, p365-377. 13p. - Publication Year :
- 2014
-
Abstract
- Plant resorption of multiple nutrients during leaf senescence has been established but stoichiometric changes among N, P and K during resorption and after fertilization are poorly understood. We anticipated that increased N supply would lead to further P limitation or co-limitation with N or K [i.e. P-(co)limitation], decrease N resorption and increase P and K resorption, while P and K addition would decrease P and K resorption and increase N resorption. Furthermore, Ca would accumulate while Mg would be resorbed during leaf senescence, irrespective of fertilization. We investigated the effect of N, P and K addition on resorption in two evergreen shrubs ( Chamaedaphne calyculata and Rhododendron groenlandicum) in a long-term fertilization experiment at Mer Bleue bog, Ontario, Canada. In general, N addition caused further P-(co)limitation, increased P and K resorption efficiency but did not affect N resorption. P and K addition did not shift the system to N limitation and affect K resorption, but reduced P resorption proficiency. C. calyculata resorbed both Ca and Mg while R. groenlandicum resorbed neither. C. calyculata showed a higher resorption than R. groenlandicum, suggesting it is better adapted to nutrient deficiency than R. groenlandicum. Resorption during leaf senescence decreased N:P, N:K and K:P ratios. The limited response of N and K and the response of P resorption to fertilization reflect the stoichiometric coupling of nutrient cycling, which varies among the two shrub species; changes in species composition may affect nutrient cycling in bogs. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00298549
- Volume :
- 174
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Oecologia
- Publication Type :
- Academic Journal
- Accession number :
- 93872393
- Full Text :
- https://doi.org/10.1007/s00442-013-2784-7