Effects of N and S addition on forest soils – the challenge experiment

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Presentation transcript:

Effects of N and S addition on forest soils – the challenge experiment Craig Neufeld (M.Sc. Candidate)

Objectives Determine the effects of N and S deposition on the forest ecosystem and their role in soil acidification

The Experiment Site located ~ 100 km SE of Ft McMurray Addition of N and S in a 2x2 factorial design N: 30 kg/ha N as NH4NO3 S: 30 kg/ha S as Na2SO4

Soil Solution Lysimeters 2 / plot / depth Depth 10 cm and 40 cm

Soil Chemistry Exchangeable ions – NH4Cl extraction NH4+ and NO3- – KCl extraction Soluble Chemistry – Saturated Paste

[NH4+] mmol-N/m2 N and S application date

[NO3-] mmol-N/m2

[SO42-] mmol-S/m2

[Na] mmol/m2

Base Cations

Soluble Base Cations - 2008

Soluble Ca:Al ratio

Exchangeable Base Cations - 2008

Summary – N effects -Addition of NH4NO3 resulted in increase leaching of NH4 and NO3 -time of leaching dependent on form of N -N addition resulted in slight, but not sig. increase in K, Ca, and Mg leaching in macro pores -N addition resulted in slight, but not sig, decrease in the Na, K, Ca, and Mg concentrations in the micropores -N addition resulted in the increase in NH4+ adsorbed to soil surface -N addition resulted in slight, but not sig, decrease in the Na, K, Ca, and Mg adsorbed to soil surface

Summary – S effects -Na2SO4 addition resulted in an increase in Na, SO42-, Ca, and Mg leaching -Na2SO4 addition resulted in an increase in the Na, Ca, and Mg concentrations in the micropores -Na2SO4 addition resulted in the slight, but not sig, increase in the amount of Na adsorbed to soil surface -Na2SO4 addition resulted in the slight, but not sig, decrease in the K, Ca, and Mg amounts adsorbed to soil surface

Aspen Growth Increment 2006 to 2008

Continuing work Complete analysis of soil leachate and soil chemistry Complete analysis of foliar and litterfall chemistry Complete vegetation growth and species composition analysis

Acknowledgements Dr. Scott Chang Dennis NOx-SO2 Management Working Group Boajing Steve and Kangho Tom

Questions?? Craig Neufeld (M.Sc. Candidate)