Under the same conditions, free radical concentration is more in soft wood than in hard wood due to the higher lignin content in the former.
相同条件下，针叶材自由基浓度大于阔叶材，这是由于前者木素成分大于后者的缘故。
2
The released quantity of residual phosphate was opositively related to the content of clay and residual phosphate in soil, and the concentration of lignin in the extracting solution.