阳明山包箨矢竹复旧更新.DOC

中文摘要陽明山包籜矢竹天然族群自1999年至2000年大量開花而枯死，族群靠更新的種子苗延續。種子苗在野外試區之存活曲線近似Deevey (1947) 所定義之第三型存活曲線，在幼體期死亡率極高。陽明山地區中湖、苗圃、大屯山、二子坪、小油坑及鞍部等地區。根據韓黃(2002)6所得之預測式(基徑（mm）=齡級×0.139+5.347)計算齡級。 結果 利用生長預測式估計陽明山各地的包籜矢竹更新仍需半年至兩年半的時間，而苗圃及二子坪地區的包籜矢竹幼苗的更新受到芒草等其他物種的干擾，呈現族群衰退的情形。以大屯山為例，利用Matrix Population Model分析歷年來監測結果，種子產量、幼苗以及成熟植株的存活率等因子對包籜矢竹的族群動態有關鍵性的影響，而以成熟植株的存活率更為重Abstract Introduction Pseudosasa usawai in Yangmingshan National Park bloomed in 1999 and 2000. After flowering, all of the individuals dead and the restoration of P. usawai are by the growth of seedlings. The formal study revealed that the growth of P. usawai fits the third growth type defined by Deevey (1947). Methods Six studied sites were selected and there we measured several growth factors, such as the diameter of stem, the number of internodes and the height of each stem, etc. Then, the estimated growth formula by regression of age and growth factors was used to estimate the remaining age to adults. Results We estimated that the recovering time still needs 0.5 to 2.7 more years at least, except two sites, “Nursery Garden” and “Ertzping”, which suffered the disturbance and invasive of other plant species, such as Miscanthus flavidus, and these invasive species make P. usawai population crash down. Discussion and Suggestion In our discussion, we took the data of population Mt. Da-Tun from July 1999 to July 2004 to test “Matrix Population Model”. After sensitivity analysis, we concluded that seed productivity, seedlings survival rate and adult survival rate are the three most important factors in population dynamics, especially in the factor “adult survival rate” if we modified the parameters to the more real situation artificially and subjectively. For the reason, we suggest that the seedlings and adults population should be protected and prevent any artificial disturbance. 第一章 緒論 第一節 研究緣起與背景 Taylor Qin (1988)1 研究Sinarundinaria fangiana 更新機制，以及Makita（1998）2對箬竹屬（Sasa）的兩個物種所做研究之結果顯示，種子苗在野外試區之存活曲線近似Deevey(1947)3所定義之第三型存活