Till sidans topp

Sidansvarig: Webbredaktion
Sidan uppdaterades: 2012-09-11 15:12

Tipsa en vän
Utskriftsversion

Water use by Swedish bore… - Göteborgs universitet Till startsida
Webbkarta
Till innehåll Läs mer om hur kakor används på gu.se

Water use by Swedish boreal forests in a changing climate

Artikel i vetenskaplig tidskrift
Författare Thomas Berg Hasper
Göran Wallin
Shubhangi Lamba
Marianne Hall
Fernando Jaramillo
Hjalmar Laudon
Sune Linder
J L Medhurst
Mats Räntfors
Bjarni Sigurdsson
Johan Uddling
Publicerad i Functional Ecology
Volym 30
Nummer/häfte 5
Sidor 690-699
ISSN 0269-8463
Publiceringsår 2016
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 690-699
Språk en
Länkar onlinelibrary.wiley.com/doi/10.1111...
Ämnesord carbon dioxide, climate change, Norway spruce, Picea abies, temperature, transpiration, water use, whole-tree chambers
Ämneskategorier Oceanografi, hydrologi, vattenresurser, Botanik, Ekologi, Skogsvetenskap

Sammanfattning

The rising levels of atmospheric carbon dioxide concentration ([CO2]) and temperature have the potential to substantially affect the terrestrial water and energy balance by altering the stomatal conductance and transpiration of trees. Many models assume decreases in stomatal conductance and plant water use under rising [CO2], which has been used as a plausible explanation for the positive global trend in river run-off over the past century. Plant water use is, however, also affected by changes in temperature, precipitation and land use, and there is yet no consensus about the contribution of different drivers to temporal trends of evapotranspiration (ET) and river run-off. In this study, we assessed water-use responses to climate change by using both long-term monitoring and experimental data in Swedish boreal forests. Historical trends and patterns in ET of large-scale boreal landscapes were determined using climate and run-off data from the past 50 years, while explicit tree water-use responses to elevated [CO2] and/or air temperature were examined in a whole-tree chamber experiment using mature Norway spruce (Picea abies (L.) Karst.) trees. The results demonstrated that ET estimated from water budgets at the catchment scale increased by 18% over the past 50 years while run-off did not significantly change. The increase in ET was related to increasing precipitation and a steady increase in forest standing biomass over time. The whole-tree chamber experiment showed that Norway spruce trees did not save water under elevated [CO2] and that experimentally elevated air temperature did not increase transpiration as decreased stomatal conductance cancelled the effect of higher vapour pressure deficit in warmed air. Our findings have important implications for projections of future water use of European boreal coniferous forests, indicating that changes in precipitation and standing biomass are more important than the effects of elevated [CO2] or temperature on transpiration rates.

Sidansvarig: Webbredaktion|Sidan uppdaterades: 2012-09-11
Dela:

På Göteborgs universitet använder vi kakor (cookies) för att webbplatsen ska fungera på ett bra sätt för dig. Genom att surfa vidare godkänner du att vi använder kakor.  Vad är kakor?