Abstract: This paper is based on the studies of 14-year-old Masson pine plantations of four density group at Mount. Loufong in Guangxi autonomous region during 1978—1981. It dealed with the change laws of nutrient contents of the pine organ and the accumulation, distribution and biologic cycles of nutrient elements of various density Masson pine stand of pole stage. The results indicated that Ⅱ density group (3210 stems/ha) stand had the greatest biomass and accumulation of nutrients and the highest rate of nutrient using. As a reference the studies is significant for regulating and controlling stem-density of pole stage of Masson pine stand, tending and thinning and applying fertilizer and maintaining ecologic balance and high productivity of forest site.

Key words: Masson Pine, Nutrient element, Nutrient cycling, Density