Savernake 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 6.2 10
P 0.3 10
K 2.7 10
Ca 7.3 10
Mg 0.4 10
Heavy Metals (g ha-1 yr-1) Cu 7.9 10
Zn 11.4 10
Cd 0.55 10
Pb 6.24 10
Ni 1.9 10
Cr 1.7 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 0.722 0.031 5 0.218 0.031 5 0.08 0.016 5
P 0.017 0.0006 5 0.011 0.0009 5 0.001 0.0002 5
K 0.117 0.004 5 0.115 0.011 5 0.042 0.005 5
Mg 0.073 0.002 5 0.011 0.0009 5 0.003 0.0009 5
Ca 2.378 0.230 5 0.054 0.002 5 0.044 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 6.64 0.150 5 2.52 0.608 5 1.98 0.168 5
Zn 19.68 1.353 5 2.6 0.498 5 2.12 0.448 5
Cd 0.968 0.094 5 0.119 0.007 5 0.107 0.020 5
Pb 17.25 2.611 5 0.937 0.158 5 0.393 0.069 5
Ni 1.109 0.083 5 0.688 0.076 5 0.483 0.043 5
Cr 1.223 0.160 5 0.59 0.180 5 0.391 0.047 5