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dc.contributor.advisorMing-Yih Chenen_US
dc.contributor.authorShih, Ying-Yuen_US
dc.description.abstract追蹤火燒存活木的年輪得知,環山地區的台灣二葉松林在最近20年 間至少曾發生3次林火。最近一次發生於1995年12月,焚燬大甲溪事業區 第22及23林班約170公頃。不具萌櫱能力的台灣二葉松平均致死率為73.1% ;闊葉樹大多由地際再萌櫱,僅1.60%死亡。火燒後的地被以高山芒及巒 大蕨最為優勢,其中巒大蕨具明顯的季節性消長。上木組成隨火燒強度、 原植群類型隨海拔高而不同。台灣二葉松之天然下種量,可能與種子來源 有關;幼苗的萌發及死亡與月降水量、微環境等有關。本區若長期不再發 生火燒,海拔較低的地區,台灣二葉松終將被殼斗科及樟科等闊葉樹所取 代;海拔較高的地區,可能演替為針闊葉樹混交林。唯人為干擾可能更為 頻繁,火燒週期或將縮短,而使本區淪為草生地。 按年輪追蹤,雪山 三六九山莊一帶之台灣冷杉林約於1903年及1957年曾發生林火。當地白木 林應是林火所造成,白木多已腐朽、傾倒,白木林景觀逐漸消失中。白木 林下以禾草類及落葉性灌木為優勢,其覆蓋度呈季節消長;鄰近未火燒的 台灣冷杉林,有少許玉山圓柏混生,地被層以苔蘚類及玉山鬼督郵為主。 台灣冷杉林與白木林間推移帶的台灣冷杉苗木,主要分布在由林緣向林 內32m的範圍內,且苗木密度與坡向有關;林外的苗木則僅出現於距林緣9 m的範圍內。1991年1月發生於雪山主峰東南坡的林火,全面燒燬約11公頃 的玉山圓柏及玉山杜鵑。由於冠層開釋,促增了地被植物的拓殖。火燒後 迄今尚未發現玉山圓柏天然下種苗。即使不再發生林火,演替為原植群所 需之年代勢必十分長久。zh_TW
dc.description.abstractBased on dendrochronological studies of fire-scarred trees, there were at least 3 fires at Taiwan red pine (Pinus taiwanensis) forest in Huanshan during the past 20 years. The last fire occurred in Dec. of 1995 and burned 170 hectares. 73.1% of Taiwan red pine were completely killed by the last fire. Mosthardwoods, however, sprouted from the base. Only 1.6% were completely killed. After burning, Miscanthus transmorrisonensis and Pteridium aquilinum subsp. wightianum were dominant ground cover species, but Pteridium aquilinum subsp. wightianum showed seasonal fluctuation. The postfire canopy composition were related with fire intensity, original vegetation type and elevation. Postfire regeneration of Taiwan red pine was related with seed source. The generation and mortality of Taiwan red pine seedlings were related with microenvironment and monthly rainfall. If there is no more fire in this area, the vegetation will succeed to hardwood forest at lower elevation or to hardwood-conifer mixed forest at higher elevation. However, more frequent fires are probably inevitable. Thus all this area may eventually change to grasslands. The white snag landscape near the Xueshan 369 Cabin was resulted from fires at Taiwan fir (Abies kawakamii) forest. The last two fires occurred around 1903 and 1957. Those snags have rotten and fallen down gradually. The dominant understory species were grasses and deciduous shrubs at the burned snag site, and were moss and Ainsliaea reflexa var. nimborum at the unburned fir forest. Most fir seedlings exist in the range between 32m from edge to forest interior and 9m from edge to exterior. The fire that occurred at the southeastern slope of Shesan peak in Jan. of 1991 completely killed about 11 hectares of Juniperus squamata and Rhododendron pseudochrysanthum. So far no postfire regeneration of Juniperus squamata has been found. Even though there is no more fire, it will still take very long time to succeed to original stand.en_US
dc.subjectTaiwan red pineen_US
dc.subjectTaiwan firen_US
dc.titleStudies on the effects of wildfires on the vegetation at Fansan and Shesanen_US
dc.typeThesis and Dissertationzh_TW
item.openairetypeThesis and Dissertation-
item.fulltextno fulltext-
Appears in Collections:生命科學系所
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