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Title: | 火燒跡地二葉松與栓皮櫟葉片之分解 Foliage Decomposition of Pinus taiwanensis and Quercus variabilis at Post-fire region |
Authors: | Pei-Fen Lan 藍佩芬 |
Advisor: | 王亞男 |
Co-Advisor: | 王明光 |
Keyword: | 火燒跡地,二葉松,栓皮櫟,分解, Post-fire region,Pinus taiwanensis,Quercus variabilis,Decomposition, |
Publication Year : | 2005 |
Degree: | 碩士 |
Abstract: | 本研究選擇勝光地區火燒(2002年5月11日)跡地中人工林內兩種主要樹種二葉松(Pinus taiwanensis Hayata)與栓皮櫟(Quercus variabilis Blume),利用枝葉包法研究野外葉片分解及養分的動態變化,同時比較不同埋置樣點及埋置方式。另外,採用實驗室培養方法研究不同溫度、水分及土壤對栓皮櫟及二葉松葉片分解的影響。
結果顯示,樣區中所選取之三個樣點在土壤基本理化性質上有些許的差異。海拔1830公尺之火燒跡地具有較高的pH值及鹽基陽離子,但有機質含量則較低。CPMAS 13C NMR的分析顯示各樣點中土壤之有機碳官能基極爲相似,均以Aromatic-C爲最多,其次爲O-alkyl-C。研究中所選用的栓皮櫟及二葉松葉片基本性質具有明顯的差異,其中栓皮櫟之氮含量要高於二葉松,而二葉松之木質素含量則高於栓皮櫟。CPMAS 13C NMR分析表示出二種葉片之有機碳官能基也非常相近,均以O-alkyl-C爲主,接近於40%。野外枝葉包分解法則顯示出,在不同處理的方法之下栓皮櫟與二葉松一年之分解量達到60-80%,分解半衰期爲2-7個月。相同方式下,栓皮櫟分解速率快於二葉松;埋入土壤後的分解速率則快於置於地表的處理方式;1830公尺處的分解速率則低於1730公尺處。葉片分解過程中,各種養分均隨時間而損失,但損失程度各有不同,在栓皮櫟中爲P>Mg>>K>Na>C>N>Ca,而在二葉松中爲P>Mg>K>Ca>Na>C>N。13C NMR結果顯示,葉片在分解過程中不同的有機碳官能基基本組成不變。 實驗室的分解培養試驗則顯示,溫度、水分及土壤對落葉分解均有重要的影響。溫度從5℃升高到25℃時,栓皮櫟分解增加49 %,二葉松則增加68 %。當水分從25 %增加到40 %時,栓皮櫟分解降低60 %,二松葉降低30 %。栓皮櫟與二葉松在1730公尺處之土壤中的分解速率其顯著快於1830公尺處之土壤。落葉分解是一個受控於多重因素的過程,不同因素對分解過程的影響程度及重要性則有待更進一步的研究。 The objective of this study was to investigate the decompositions and nutrient dynamics of oak(Quercus variablilis Blume) and pine (Pinus taiwanensis Hayata) leaves in a burned site using the litterbag method. The effects of site and buried type on leaf decomposition were also conducted. In the laboratory, the impacts of incubation temperature, soil moisture and type of leaf decomposition were simultaneously considered.Results showed that soil basic physicochemical properties differed from the selected three sites. In the high elevation site, pH value and base cation contents were higher than the other sites, but low organic carbon content was observed. Soil organic carbon functional groups in all sites were similar and dominated by aromatic-C and O-alkyl-C from the results of CPMAS 13C NMR. In the leaf decomposition, oak leaf had higher N and low lignin content than those of pine. Both leaves of oak and pine comprised mainly of O-alkyl-C. According to the results in situ, oak and pine leaves decomposed 60-80% after one year and had a half decomposition time of 2 to 7 months. Results also indicated that oak leaf decomposed faster than pine leaf, leaves decomposed quickly buried in the soil and in the low elevation site. Nutrients released from the leaves during the decomposition varied with time and tree species.Laboratory incubation results showed that high temperature and low soil moisture could result in high decomposition rate of oak and pine leaves. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24406 |
Fulltext Rights: | 未授權 |
Appears in Collections: | 森林環境暨資源學系 |
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