Loch Awe 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 4.3 10
P 0.5 10
K 3.9 10
Ca 5.1 10
Mg 0.8 10
Heavy Metals (g ha-1 yr-1) Cu 29.1 10
Zn 83.9 10
Cd 1.68 10
Pb 6.07 10
Ni 32.2 10
Cr 46 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 0.374 0.022 5 0.05 0.005 5 0.022 0.002 5
P 0.053 0.002 5 0.005 0.0008 5 0.002 0.001 5
K 0.289 0.011 5 0.045 0.005 5 0.026 0.002 5
Mg 0.058 0.077 5 0.008 0.0009 5 0.008 0.0007 5
Ca 0.380 0.035 5 0.045 0.002 5 0.05 0.003 5
S 124.3 10.63 5 25.41 3.293 5 14.52 1.927 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 5.36 0.237 5 5.34 1.150 5 2.74 1.150 5
Zn 60.74 8.949 5 8.76 1.405 5 7.18 0.385 5
Cd 0.634 0.135 5 0.21 0.051 5 0.204 0.032 5
Pb 0.82 0.150 5 1.084 0.209 5 0.648 0.201 5
Ni 1.367 0.160 5 7.613 2.157 5 2.047 0.606 5
Cr 2.100 0.319 5 11.24 2.823 5 2.574 0.923 5