The oven-dried tree tissue samples were further used for C concentration determination. The dried samples were grounded using a Retsch Mixer Mill MM 400 (Retsch Lab Equipment, Germany) until the size of tissue was reduced to 10–20 lm.
The oven-dried tree tissue samples were further used for C concentrationdetermination. The dried samples were grounded usinga Retsch Mixer Mill MM 400 (Retsch Lab Equipment, Germany) untilthe size of tissue was reduced to 10–20 lm.