Stem growth and respiration of Pinus cembra at timberline View Homepage


Ontology type: schema:MonetaryGrant     


Grant Info

YEARS

2006-2009

FUNDING AMOUNT

N/A

ABSTRACT

In high altitude timberline environments low temperature during the growing period is suggested to be the majorfactor restricting tree growth. However, the physiology of cambial activity, i.e. onset, cessation, year-to-yearvariability and relation to local environmental factors, has not yet been elucidated for Stone pine (Pinus cembra L.)along a temperature gradient. Pinus cembra will be chosen because of its dominance at timberline in the centralpart of the Eastern Alps.An altitudinal gradient from the closed forest (c. 1700 m a.s.l.) up to the tree species limit ("krummholz"-limit;2150 m a.s.l.) will be established at Mt. Patscherkofel (Tyrol, Austria) and daily stem growth and seasonaldynamics of wood formation of P. cembra are proposed to be followed by installation of automatic banddendrometers and continuous extraction of micro-cores, respectively (n = 3 trees/site). Additionally, records ofcambial activity will be compared with stem respiration, photosynthesis, local microclimate and tree phenology,because radial stem growth is closely related to the cambial activity and hence also to carbon efflux from thenumber of living and newly built cells in the xylem and ploem. By this way, along an altitudinal transect (i) theseasonal dynamics in stem respiration will be related to the prevailing temperature conditions and total stem CO2efflux will be separated into growth and maintenance respiration, and (ii) and we will also measure carbon uptakeby the foliage because woody tissue strongly depends on the supply of carbohydrates from photosynthesis. Hence, this proposal primarily aims at determining the dynamics of cambial activity and wood formation inrelation to stem respiration of P. cembra and their dependence on photosynthesis and microclimate along a naturalgradient of increasing temperature limitation for tree growth within the timberline ecotone. The determination of dynamics of cambial acitivity will also allow a more detailed interpretation of growth-climaterelationships, within the timberline ecotone. Such studies provide an opportunity for spatio-temporal studies in thecontext of climate warming because in contrast to short-term artificial warming experiments the ecosystem as awhole had time to adjust to long-term, gradual changes in temperature. Furthermore, based on the results of theproposed study an optimisation of climate-growth models used for this species to reconstruct summer temperaturebased on tree-ring widths is rendered possible. More... »

URL

https://pf.fwf.ac.at/en/research-in-practice/project-finder/4148

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