Effects of Simulated Nitrogen Deposition on Growth and CO2 Exchange Capacity of Sphagnum Capillifolium and Polytrichum Strictum in a Bog

Authors:
Sari Juutinen, Tim Moore, Allison de Young, Anna M. Laine, Margaret Kalacska Mandy Chong, Jill L. Bubier

Book:
Proceedings of the 14th International Peat Congress

Venue:
Stockholm

Keywords:
change, n-deposition, peatland, photosynthesis, vegetation

Documentfile:
Juutinen et al 2012: Effects of Simulated Nitrogen Deposition on Growth and CO2 Exchange Capacity of Sphagnum Capillifolium and

Summary:

Theme X. Peatland carbon budgets and greenhouse gas (GHG) fluxes

SUMMARY

We studied the responses of height increment and photosynthesis of Sphagnum capillifolium and Polytrichum strictum to 5 years of elevated N deposition at a bog. Initially, N addition increased the growth rate of both species, but growth of S. capillifolium in the high N treatment ultimately decreased to less than the control. P. strictum had still slightly higher growth and noticeably increased biomass in the N treatments than in the control in the 5th treatment year. Photosynthesis per ground area responded positively to biomass increase by P. strictum.