TY  - JOUR
A1  - Smith, Benjamin
A1  - Wårlind, David
A1  - Arneth, Almut
A1  - Hickler, Thomas
A1  - Leadley, Paul W.
A1  - Siltberg, Joe
A1  - Zaehle, Sönke
T1  - Implications of incorporating N cycling and N limitations on primary production in an individual-based dynamic vegetation model
T2  - Biogeosciences discussions
N2  - The LPJ-GUESS dynamic vegetation model uniquely combines an individual- and patch-based representation of vegetation dynamics with ecosystem biogeochemical cycling from regional to global scales. We present an updated version that includes plant and soil N dynamics, analysing the implications of accounting for C-N interactions on predictions and performance of the model. Stand structural dynamics and allometric scaling of tree growth suggested by global databases of forest stand structure and development were well-reproduced by the model in comparison to an earlier multi-model study. Accounting for N cycle dynamics improved the goodness-of-fit for broadleaved forests. N limitation associated with low N mineralisation rates reduces productivity of cold-climate and dry-climate ecosystems relative to mesic temperate and tropical ecosystems. In a model experiment emulating free-air CO2 enrichment (FACE) treatment for forests globally, N-limitation associated with low N mineralisation rates of colder soils reduces CO2-enhancement of NPP for boreal forests, while some temperate and tropical forests exhibit increased NPP enhancement. Under a business-as-usual future climate and emissions scenario, ecosystem C storage globally was projected to increase by c. 10 %; additional N requirements to match this increasing ecosystem C were within the high N supply limit estimated on stoichiometric grounds in an earlier study. Our results highlight the importance of accounting for C-N interactions not only in studies of global terrestrial C cycling, but to understand underlying mechanisms on local scales and in different regional contexts.
Y1  - 2013
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/42376
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-423765
SN  - 1810-6285
VL  - 10
SP  - 18613
EP  - 18685
PB  - Copernicus
CY  - Katlenburg-Lindau [u.a.]
ER  -