Table 3.

A comparison between microanalysis results from three sites for Al and Si in the transfusion cells of 2-year-old white pine needles

Needle zone	Al (mmol kg–1)			Si (mmol kg–1)
	Glendon pH 6.7a	Muskoka pH 4.2	Sudbury pH 3.5–4.0	Glendon pH 6.7	Muskoka pH 4.2	Sudbury pH 3.5–4.0
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

Data from Hodson and Sangster (1999, 2000, 2002).

^a Soil pH at 40 cm.