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