Abstract:

Within the boundary of a small watershed covered with Pinus elliottii stand, the cycling process of K, P, Ca, Mg, Zn, Cu, Fe and Mn, including their average budget, accumulation, storage, leaching, return and absorption were studied in 1993—1994.The stand had high productivity(20.349t/hm²·a and 9.408m³/hm²·a)because of its high usage efficiency of mineral elements.The total amount of mineral elements input into the forest was less than that of output from it in 1993—1994.The forest was still on the degenerate state with less return amount and lower cycling efficiency. It is suggested to adjust and control such a forest by some artificial measures such as fertilization and mixed planting with broadleaved tree species.

Key words: Pinus elliottii, Artificial forest, Nutrient cycle