Grizedale 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 4.0 10
P 0.2 10
K 2.4 10
Ca 5.7 10
Mg 0.3 10
Heavy Metals (g ha-1 yr-1) Cu 9.3 10
Zn 27.8 10
Cd 0.23 10
Pb 9.52 10
Ni 2.6 10
Cr 2.3 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 0.578 0.030 5 0.17 0.033 5 0.074 0.006 5
P 0.018 0.001 5 0.010 0.002 5 0.001 0.0002 5
K 0.092 0.016 5 0.128 0.024 5 0.063 0.010 5
Mg 0.068 0.005 5 0.011 0.002 5 0.002 0.0004 5
Ca 1.900 0.229 5 0.115 0.051 5 0.051 0.003 5
S 333.1 19.71 5 42.54 1.463 5 24.09 1.019 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 6 0.386 5 3.8 0.476 5 3.7 1.086 5
Zn 21.78 5.269 5 13.46 3.023 5 7.02 1.391 5
Cd 0.52 0.039 5 0.058 0.013 5 0.058 0.016 5
Pb 35.4 7.746 5 1.452 0.219 5 0.784 0.248 5
Ni 1.527 0.142 5 1.233 0.084 5 0.768 0.053 5
Cr 1.632 0.185 5 0.972 0.174 5 0.792 0.140 5