Brechfa 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 5.9 10
P 3.1 10
K 4.6 10
Ca 3.9 10
Mg 1.2 10
Heavy Metals (g ha-1 yr-1) Cu 6.6 10
Zn 29.4 10
Cd 0.29 10
Pb 2.23 10
Ni 5.3 10
Cr 3.1 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 1.112 0.180 5 0.124 0.018 5 0.086 0.005 5
P 0.069 0.014 5 0.007 0.0008 5 0.007 0.001 5
K 0.237 0.011 5 0.078 0.009 5 0.171 0.017 5
Mg 0.078 0.004 5 0.023 0.002 5 0.040 0.009 5
Ca 0.661 0.038 5 0.069 0.005 5 0.084 0.008 5
S 215.5 39.65 5 34.29 2.704 5 38.31 5.815 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 9.088 1.800 5 1.24 0.153 5 1.62 0.654 5
Zn 27.34 2.563 5 4.18 0.444 5 10.76 3.574 5
Cd 0.086 0.026 5 0.07 0.038 5 0.083 0.040 5
Pb 3.925 0.431 5 0.339 0.068 5 0.596 0.095 5
Ni 6.094 1.615 5 1.055 0.174 5 1.367 0.200 5
Cr 4.343 0.534 5 0.600 0.130 5 0.691 0.368 5