Abstract:

Using the method of water-balance, watershed experiment technique and located observation, based on the data and information collected from May, 2000 to June, 2003, the water balance of evergreen broad-leaved forest ecosystem in Dagangshan Mountain is studied. The results showed: Average annual precipitation was 1 772.7 mm,mainly in April to June,and 48.2%,48.1% and 3.7% of which allocated to total runoff(854.3 mm), evapotranspiration (852.5 mm) and change of soil water storage(65.9 mm);Precipitation distribution has obviously seasonal change in crown level in 2002, in rain season(April—September),its crown interception ratio(16.5%) is less than drought season(October—next March);Average annual output gross of watershed is 854.3 mm, the pathway of runoff flow is 48.2%. Mainly of this underground runoff flow is 853.1 mm, and the earth’s surface runoff flow is 1.2 mm.

Key words: Dagangshan Mountain, evergreen broad-leaved forest, hydrological properties, water balance