Effects of simulated long-term N deposition on Picea abies and Pinus sylvestris growth in boreal forest

Sammanfattning

Modelling studies have suggested that atmospheric nitrogen (N) deposition will increase forest carbon sequestration by stimulating tree growth. However, few long-term experiments studying N deposition effects on tree growth in boreal forests have been reported. This study empirically explores the relation between application rates of N, simulating levels of N deposition relevant for Europe, and the growth of Picea abies (L.) Karst. and Pinus sylvestris L. in a low N deposition area (<2 kg N.ha(-1).year(-1)), we manually added 0, 12.5, and 50 kg N.ha(-1).year(-1) to a forest site dominated by P. abies for 19 years and 0, 3, 6, 12.5, and 50 kg N.ha(-1).year(-1) to a forest site dominated by P. sylvestris for 10 years. On both sites, linear regression analyses displayed significant relations between mean annual tree growth and N additions: P. abies relative growth rate increased by 1.2% per kg N added and that of P. sylvestris increased by 1.6% per kg N added. The growth response, however, varied over time, highlighting the necessity for long-term experiments to apprehend effects of eutrophication on forests. Generally, our study confirms the results of previous modelling studies assessing forest growth responses to N deposition over Europe.

Nyckelord

anthropogenic nitrogen (N) deposition; repeated N addition; forest growth; Norway spruce; Scots pine

Publicerad i

Canadian Journal of Forest Research
2016, volym: 46, nummer: 11, sidor: 1396-1403
Utgivare: CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS

SLU författare

• From, Fredrik

  • Institutionen för skoglig genetik och växtfysiologi, Sveriges lantbruksuniversitet
    

• Lundmark, Tomas

  • Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
    

• Mörling, Tommy

  • Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
    

• Pommerening, Arne

  • Institutionen för skoglig resurshushållning, Sveriges lantbruksuniversitet
    

• Nordin, Annika

  • Institutionen för skoglig genetik och växtfysiologi, Sveriges lantbruksuniversitet
    

Associerade SLU-program

SLU Future Forests

UKÄ forskningsämne

Skogsvetenskap

Publikationens identifierare

• DOI: https://doi.org/10.1139/cjfr-2016-0201

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/77961