Table 1

Table 1. A comparison between microanalysis results from three sites for Al and Si in the transfusion cells of 2 year old white pine needles. Glendon results (unpublished), Muskoka (Hodson and Sangster, 1999), Sudbury (present study)

		Al (mmol kg-1)			Si (mmol kg-1)
Needle Zone	Glendon	Muskoka	Sudbury	Glendon	Muskoka	Sudbury
Base	9.6	12.7	14	29.2	13	16.6
Middle	13.9	30.2	11.1	13.1	19.5	25
Tip	9.1	44.5	61.4	611	5838	4282