Forest Investment Account

Abstract of FII Project R04-092

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Sulphur Fertilization of Lodgepole Pine - A Stable Isotope Tracer Study

Author(s): Sanborn, Paul (University of Northern British Columbia)
Subject: Fishery, Silviculture/Forest Management Systems
Series: Forest Investment Account (FIA) - Forest Science Program


Sulphur (S) deficiencies in lodgepole pine are widespread in the B.C. central interior, but there is an insufficient basis for prescribing fertilization treatments with both immediate and sustained growth responses. This proposal builds on the Ministry of Forests' fertilization research program and careful pilot studies, to combine area-based fertilization response methods with stable isotope tracing of the uptake and fate of S fertilizers. Both elemental S and more immediately plant-available sulphate-S forms will be compared, at operationally realistic addition rates and in combination with nitrogen fertilization. Using two sites that represent typical site and climate conditions in the Sub-Boreal Spruce zone, we will compare relative uptake of these forms, their mobility and tranformations in the soil, and their effects on tree growth. This research will give silviculturists a credible scientific foundation for making better fertilization decisions, and demonstrate serious intent to examine the effects of intensive forest management in B.C.

For further information, please contact Paul Sanborn, University of Northern British Columbia (

Updated September 08, 2005 

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