Alice Holt/Straits Level II plot - Uptake of heavy metals

 

Rate of uptake of macronutrients and heavy metals based on estimated tree growth rates

	Element	Rate of uptake	Sample size
Macronutrients (kg ha-1 yr-1)	N	4.8	10
	P	0.5	10
	K	2.9	10
	Ca	9.4	10
	Mg	0.5	10
Heavy Metals (g ha-1 yr-1)	Cu	8.8	10
	Zn	5.3	10
	Cd	0.54	10
	Pb	6.88	10
	Ni	5.7	10
	Cr	7.1	10

Levels of various macronutrients (mg/kg) in bark, sapwood and heartwood of a selection of dominant and co-dominant trees

Element	Bark			Sapwood			Heartwood
	Average	Standard error	Sample size	Average	Standard error	Sample size	Average	Standard error	Sample size
N	0.538	0.030	5	0.100	0.015	5	0.072	0.003	5
P	0.021	0.001	5	0.019	0.009	5	0.004	0.001	5
K	0.131	0.009	5	0.089	0.025	5	0.045	0.003	5
Mg	0.065	0.005	5	0.009	0.003	5	0.005	0.001	5
Ca	2.355	0.145	5	0.060	0.011	5	0.050	0.006	5
S	281.3	18.93	5	44.010	4.406	5	32.100	3.925	5

Levels of various heavy metals (mg/kg) in bark, sapwood and heartwood of a selection of dominant and co-dominant trees

Element	Bark			Sapwood			Heartwood
	Average	Standard error	Sample size	Average	Standard error	Sample size	Average	Standard error	Sample size
Cu	7.3	0.411	5	1.68	0.128	5	2.24	0.421	5
Zn	11.16	2.585	5	0.5	0.083	5	0.54	0.401	5
Cd	0.51	0.053	5	0.096	0.021	5	0.134	0.067	5
Pb	13.23	2.593	5	0.826	0.029	5	0.728	0.078	5
Ni	2.213	0.268	5	1.725	0.396	5	1.021	0.187	5
Cr	2.204	0.406	5	2.283	0.471	5	1.209	0.189	5