惠荪林场三种林分枯落物养分回归量之季节变化seasonal variation of .pdf

24 (1) : 5370, 2002 53 2 3 1988 9 1999 8 40.2743.07 % 0.862.29 % 0.060.26 % 0.471.31 % 0.251.00 % 0.180.27 % 1.932.88 t/ha 41.48104.30 kg/ha 3.408.93 kg/ha 21.3666.55 kg/ha 20.8961.45 kg/ha 9.0218.04 kg/ha Research paper Seasonal Variation of Litterfall Nutrient Recycling Amount in Three Forest Stands at Hue-Sun Forest Station 2 3 Chiang-Her Yen Jia-Huey Chen Abstract The seasonal variation of litterfall nutrient concentration and nutrient recycled amount of three different stands (natural hardwood, NS; secondary hardwood, SS; and China-fir plantation, CPS) in the Hui-Sun Experimental Forest were monitored monthly by using littertrap approach from September 1988 to August 1999. During the investigation period, the litterfall nutrient concentration of carbon was 40.27 - 43.07 %, nitrogen 0.86-2.29 %, phosphorus 0.06-0.26 %, potassium 0.47-1.31 %, calcium 0.25- 1.00, and magnesium 0.18-0.27 %. Annual amounts of these recycled nutrients in litterfall were 1.93-2.88 t/ha C, 41.48-104.30 kg/ha N, 3.40-8.93 kg/ha P, 21.36-66.55 kg/ha K, 20.99-61.45 kg/ha Ca, and 9.02-18.04 kg/ha Mg. Total annual nutrient input from litterfall were NS SS CPS. Key words litterfall, nutrient concentration, nutrient recycled amount, seasonal variation. 1. This project was sponsored by the National Science Council, R.O.C. Grant number. 2. Assistant Professor, Department of Forestry, NCHU. Corresponding author. 3. Graduate student, Department of Forestry, NCHU. 54