Abstract:

The 4-year-old masson pine stand was monitored on soil erosion in runoff plots.The results indicated :The water, soil and nutrient loss of forest lands with different site preparation overall-site preparation or hole site preparation was biggest in the first year, 1049.70 t/hm²(runoff), 5.35 t/hm²(soil loss), 12.91 kg/hm²(nutrient runoff) and 410.44 kg/hm²(soil nutrient loss) in the full site preparation plots, 921.20 t/hm², 5.79 t/hm², 10.80 kg/hm² and 467.93 kg/hm² respectively in the hole site preparation plots 1195.50 t/hm², 2.87 t/hm², 8.96 kg/hm² and 200.05 kg/hm² respectively in CK.The runoff loss was reduced year by year from the second year to the fourth year.The runoff loss of plots prepared with 3 types was serious in the first year and light in the fourth year, the runoff loss in the second and third year followed the order:overall site preparation >hole site preparation >CK.All these monitoring results provided a solid base for fast-growing and high-yielding stand establishment and soil fertility conservation.

Key words: Masson pine, Young stand, Environment monitor, Soil and water losses