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Canopy transpiration in a chronosequence of Central Siberian pine forests

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons62616

Zimmermann,  R.
Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons62549

Schulze,  E.-D.
Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons62606

Wirth,  C.
Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons62615

Ziegler,  W.
Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Zitation

Zimmermann, R., Schulze, E.-D., Wirth, C., Schulze, E.-D., Mcdonald, K. C., Vygodskaya, N. N., et al. (2000). Canopy transpiration in a chronosequence of Central Siberian pine forests. Global Change Biology, 6(1), 25-37.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000E-CD53-6
Zusammenfassung
Tree transpiration was measured in 28, 67, 204 and 383-y-old uniform stands and in a multicohort stand (140-430 y) of Pinus sylvestris ssp. sibirica Lebed. in Central Siberia during August 1995. In addition transpiration of three codominant trees was monitored for two years in a 130-y-old stand. All stands established after fire. Leaf area index (LAI) ranged between 0.6 (28-y-old stand) and 1.6 for stands older than 67-y. Stand xylem area at 1.3 m height increased from 4 cm(2) m(-2) (28-y) to 11.5 cm(2) m(-2) (67-y) and decreased again to 7 cm(2) m(-2) in old stands. Above-ground living biomass increased from 1.5 kg dry weight m(-2) (28-y) to 14 kg dry weight m(-2) (383-y). Day-to-day variation of tree transpiration in summer was dependent on net radiation, vapour pressure deficit, and soil water stress. Tree-to-tree variation of xylem flux was small and increased with heterogeneity in canopy structure. Maximum rates of xylem flux density followed the course of net radiation from mid April when a constant level of maximum rates was reached until mid September when low temperatures and light strongly reduced flux density. Maximum sap flux density (60 g m(-2) s(-1)) and canopy transpiration (1.5 mm d(-1)) were reached in the 67-y stand. Average canopy transpiration of all age classes was 0.72 +/- 0.3 mm d(-1.) Canopy transpiration (E) was not correlated with LAI but related to stand sapwood area SA (E = - 0.02 + 1.15SA R-2) which was determined by stand density and tree sapwood area. [References: 30]