惠蓀林場三種林分枯落物養分迴歸量之季節變化

Seasonal Variation of Litterfall Nutrient Recycling Amount in Three Forest Stands at Hue-Sun Forest Station

本研究以南投縣惠蓀林場關刀溪生態系相鄰的三種不同林型（天然林、次生林、杉木林）為調查試區，自1988 年9 月至1999 年8 月利用收集網收集枯落物，探討枯落物養分濃度與迴歸量之季節性變化。三種林分枯落物碳濃度平均在40.27~43.07 %，氮濃度在0.86~2.29 %，磷濃度在0.06~0.26 %，鉀濃度在0.47~1.31 %，鈣濃度在0.25~1.00 %，鎂濃度在0.18~0.27 % 間。全年枯落物養分迴歸量碳為1.93~2.88 t/ha；氮為41.48~104.30 kg/ha，磷為3.40~8.93 kg/ha；鉀為21.36~66.55 kg/ha；鈣為20.89~61.45 kg/ha；鎂為9.02~18.04 kg/ha。枯落物養分迴歸量以天然闊葉林最多，次生闊葉林次之，杉木人工林最少。 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.

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.