Dynamics of soil nutrient contents in cutting forestlands of broad-leaved Korean pine forest on Changbai Mountains
长白山阔叶红松林采伐迹地土壤养分含量动态研究

A comparative study was made to analyze the dynamics of soil nutrient contents in different cutting forestlands of broad-leaved Korean pine forest on Changbai Mountains. The results showed that soil nutrient contents in different forestlands with different cutting times had obvious differences. With the cutting time going on after logging, soil pH value had the trend of declining firstly and increasing afterwards. The acidity of the topsoil was the highest after cutting for five years, and that of 10-20 cm soil layer was the strongest after cutting for ten years. The organic matter content as well as the total and available contents of nutrients increased at the first 2-5 years, and then declined rapidly, especially for those in topsoils. The cation exchange capacity (CEC), exchangeable Ca and exchangeable Mg had the same trend. Therefore, after forest cutting, artificial planting and regeneration should be carried out in time to resume the vegetation to reduce and prevent soil nutrient loss.