Wykeham 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 7.4 10
P 3.0 10
K 5.4 10
Ca 6.5 10
Mg 1.4 10
Heavy Metals (g ha-1 yr-1) Cu 9.5 10
Zn 23.0 10
Cd 0.30 10
Pb 1.37 10
Ni 4.1 10
Cr 4.5 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 0.644 0.028 5 0.13 0.012 5 0.114 0.008 5
P 0.029 0.002 5 0.006 0.001 5 0.006 0.0005 5
K 0.229 0.021 5 0.086 0.011 5 0.123 0.009 5
Mg 0.049 0.005 5 0.018 0.002 5 0.041 0.006 5
Ca 1.099 0.105 5 0.078 0.009 5 0.096 0.005 5
S 130.5 11.05 5 36.75 5.506 5 26.1 1.241 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 4.16 0.341 5 1.82 0.361 5 1.7 0.303 5
Zn 7.54 1.517 5 3.08 1.281 5 6.48 1.818 5
Cd 0.042 0.009 5 0.062 0.020 5 0.06 0.017 5
Pb 1.844 0.221 5 0.130 0.049 5 0.308 0.097 5
Ni 0.133 0.133 5 0.862 0.099 5 0.713 0.079 5
Cr 2.860 0.610 5 1.087 0.320 5 0.379 0.062 5