Sherwood/Hope 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 1.7 10
P 0.1 10
K 1.3 10
Ca 2.5 10
Mg 0.5 10
Heavy Metals (g ha-1 yr-1) Cu 4.9 10
Zn 23.9 10
Cd 1.46 10
Pb 5.47 10
Ni 1.0 10
Cr 1.2 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 0.246 0.008 5 0.062 0.019 5 0.024 0.002 5
P 0.013 0.001 5 0.005 0.0005 5 0.001 0.0003 5
K 0.071 0.008 5 0.056 0.007 5 0.028 0.001 5
Mg 0.016 0.001 5 0.016 0.003 5 0.017 0.002 5
Ca 0.314 0.051 5 0.059 0.003 5 0.071 0.004 5
S

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 3.86 0.107 5 1.74 0.378 5 1.18 0.243 5
Zn 11.18 0.946 5 8.16 0.911 5 7.28 0.865 5
Cd 0.581 0.034 5 0.393 0.040 5 0.56 0.046 5
Pb 6.14 0.945 5 0.982 0.356 5 1.99 0.388 5
Ni 0.498 0.056 5 0.389 0.090 5 0.256 0.110 5
Cr 0.757 0.082 5 0.286 0.102 5 0.438 0.055