桔落物為生態~統之重要過程﹒本研究於令歡山小風口臺灣冷杉(Abies kawakamii)林內設置枯落4均收集綱，自2011 年1 月至2011 年12月一年期間，每雙週收集結落 物-次，以了解臺灣冷杉林枯落物動態﹒結果顯示，今歡山臺灣冷杉林分年桔落物量為 3, 129 ::1: 445 kg ha' l yr孔，其中各組成比例...樂部佑的%、枝條占12 %、樹處占11% 、繁星直部 占1%及其它占7 %'顯示臺灣冷杉枯落物主要以黨~形式回歸林地﹒研究期間月枯落物量 動態高峰為11 月、12月，枯落物量分別為640 kg ha.1mo-1 、507 kg ha.1mo.1 ，各占全年桔落街 量之20.4%典16.2% '其中以葉都增加為主，可能為豪雨、冰草或低溫影響而形成大量落 繁﹒至於企灣冷杉枝芽展黨期間(4月至6月)桔落物量僅略微增加，以冷杉黨都給繕物增 加為主，可能為降雨強度增加所致，與企灣中低海拔闊葉林春季換乘形成落葉高峰比較， 企灣冷杉林並未呈現春季換賣書高峰﹒ 通常颱風盛行的夏季7 月、8 月a9月桔落物量反而較 其他時期...少，由於研究期間並無明顯颱風侵近，反映2011 年合歡山區企灣冷杉林受颱風 影響並不明顯﹒

Litterfall is one of the important processes in ecosystem studies. In order to understand lìtterfall dynamics ofTaiwanese fir (Abies kawakamii), lìtter traps were set up near the tourist center at Xiao-Feng-Ko, Hehuan mountain, and litterfall samples were collected biweekly in 201 1. Results showed that annuallitterfall was 3 ， 129 士445 kg ha-1, composing offoliage (69 % of annual total), branch (12 %), bark (11 %), reproductive part (1 %) and miscellaneous (7 %); thus, showing that foliage was the m吋or form of litterfall returned to the forest floor. Monthly litterfall were higher in November (640 kg ha-1, 20.4% of annual total) and December (507 kg ha-1, 16.2 % ofannual total), mainly composing offoliage (86.4 % ofmonthly total in November, and 83.2 % ofthat in December). Higher monthly totals could have been caused by heavy rainfall, hail fall and cold temperature in these two months. Litterfall (mainly foliage) increased slightly, which was probably caused by increased rainfall intensity near the timing of new foliage expansion (late April to early June); thus, indicating that no notable foliage replacement occurred as in lowland hardwood forests. Uncommonly, no significant typhoon occurred during the summer of 20 日， therefore, lower monthly litterfall were found during July, August and September in this alpine forest.