臺灣赤楊於武陵廢耕地造林之新途徑：苗坑凹植法與復育策略

臺灣赤楊是武陵地區常見的優勢種，為武陵廢耕地復原造林之最佳樹種，本文探究其造林方法及更新阻礙與復育策略。結果顯示，以傳統平植法來出栽臺灣赤楊苗木無法造林成功，以新設計之苗坑凹植法來出栽苗木約1.5年後之存活率仍可達70.6%，存活苗木每年之高度約可增長90cm，地徑約可增長1.3cm。為避免晚春霜凍及水分缺乏，武陵地區苗木出栽的最佳時機應於4月中旬至6月底之雨季。本文綜合分析臺灣赤楊定殖之阻礙因素，提出以臺灣赤楊啟動廢耕地森林復育之策略，可做為未來中海拔廢耕地復原造林之參考。 Alnus formosana is a common dominant species in Wuling area and it is the best tree species for reforestation of Wuling abandoned farmland. This paper explores the reforestation methods and restoration strategies of A. formosana. The results revealed that the traditional flat planting method of A. formosana did not work out, but the innovative method, seedling-pitted concave planting method, effectively raised the survival rate of the planted seedlings (70.6% survival rate after 1.5years of transplanting). The annual growth of the survived seedlings was ca. 90 cm of height and ca. 1.3 cm of ground diameter. To avoid late spring frost and water deficiency, the optimum period for seedlings transplanting in Wuling area was the raining season from mid-April to late-June. Based on the overall analysis of the obstructive factors of A. formosana colonization, we provided suggestive forest recovery strategies by transplanting A. formosana on abandoned farmlands, which can be applied for forest restoration of mid-altitude abandoned farmlands in the future.