NDLI: The limiting roles of nitrogen and moisture on Sphagnum angustifolium growth over a depth to water table gradient

Content Provider	Springer Nature Link
Author	Graham, Jeremy A. Vitt, Dale H.
Copyright Year	2016
Abstract	Boreal peatlands are projected to face numerous stressors in the future, including changes in precipitation and nitrogen cycle perturbations. Nitrogen is currently believed to be the limiting factor to peatlands of western Canada, including to Sphagnum, however new insights suggest the possibility of multiple limiting factors.Growth, nitrogen assimilation, and annual retention of Sphagnum angustifolium, a species with a broad niche, were observed across a depth to water table gradient for three years to further understand the partitioning of key limiting factors.Within each year differences of linear growth were responsible for variations in net primary production (NPP), yet yearly differences of NPP were attributed to annual differences in bulk density. Sphagnum angustifolium on the wet end of the depth to water gradient is characterized as nitrogen limited with high growth and low N concentrations, compared to less growth and high N concentrations at the water limiting dry end. Of the nitrogen that is annually assimilated by S. angustifolium, approximately 1.3 g N m$^{-2}$ is lost from biomass one year subsequent to assimilation, demonstrating the rapid turnover of this nutrient.The depth to water table gradient is strongly related to many S. angustifolium growth parameters and is a pivotal mechanism in delineating limiting factors within a single complex peatland ecosystem.
Starting Page	427
Ending Page	439
Page Count	13
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	404
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-04-28
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sphagnum Peatland Nitrogen Depth to water table Limiting factors Boreal Moss Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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