Thetford 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 3.2 10
P 0.3 10
K 1.6 10
Ca 5.0 10
Mg 0.8 10
Heavy Metals (g ha-1 yr-1) Cu 6.1 10
Zn 19.4 10
Cd 0.76 10
Pb 1.71 10
Ni 2.3 10
Cr 6.2 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 0.214 0.006 5 0.088 0.005 5 0.03 0.005 5
P 0.009 0.001 5 0.009 0.0003 5 0.0022 0.0003 5
K 0.034 0.004 5 0.048 0.006 5 0.0216 0.002 5
Mg 0.013 0.002 5 0.014 0.001 5 0.222 0.002 5
Ca 0.439 0.077 5 0.067 0.004 5 0.0992 0.010 5
S 0 0 0 0 0 0 0 0 0

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 2.48 0.162 5 1.32 0.101 5 1.14 0.237 5
Zn 9.28 1.021 5 3.46 0.280 5 4.14 0.317 5
Cd 0.29 0.041 5 0.176 0.030 5 0.197 0.024 5
Pb 1.536 0.202 5 0.303 0.103 5 0.259 0.060 5
Ni 0.294 0.033 5 0.58 0.027 5 0.435 0.088 5
Cr 0.842 0.279 5 1.26 0.696 5 1.489 0.276 5