Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/27816
DC FieldValueLanguage
dc.contributor.advisor葉學文zh_TW
dc.contributor.advisorChen-Chung Tanen_US
dc.contributor.advisor譚鎮中zh_TW
dc.contributor.author李振州zh_TW
dc.contributor.authorLee, Chen-Chouen_US
dc.date2003zh_TW
dc.date.accessioned2014-06-06T07:28:37Z-
dc.date.available2014-06-06T07:28:37Z-
dc.identifier.urihttp://hdl.handle.net/11455/27816-
dc.description.abstract關刀溪森林生態樣區位在台灣中部海拔700至1700公尺高的山區,研究站屬於台灣長期生態研究網的成員。研究區遍植35年前人工造林的台灣杉以及原生闊葉林、次生混合林。測量與分析項目包括土壤二氧化碳的釋放量及其13CPDB 值、土壤碳、氮素含量及其13CPDB、15NAir值、落葉層碳、氮含量等。 在穿越集水區三種林分的人行步道上劃設的採樣點,分別現場量測土壤表面二氧化碳的釋放速率,並取樣帶回土壤A層分析其中有機碳與氮。落葉層總有機碳含量從221到546 g C m-2,土壤層則為18.2到41.4 kg C m-2;總有機氮含量則各為4.5~13.9與1.62~3.74 kg N m-2;落葉層碳氮比為32~79,土壤層為11~16。 撥開土壤表面落葉層後,以動態氣室與紅外線氣體檢測儀現場操作測定二氧化碳釋放率。土壤二氧化碳釋放率隨晝夜與季節變化,在1995年6月到1997年4月間,試區土壤二氧化碳釋放率範圍從9到50 mol CO2 m-2 month-1。長期觀測各樣點土壤呼吸量的結果推算,土壤碳的年釋放量為1.24到2.35 kg C m-2 yr-1。 將杉木林樣區土壤剖面160公分深分成許多層次,依序取樣並測量其土壤碳、氮含量及其13C PDB、15NAir值。土壤碳素經由表層之土壤呼吸年釋放量為1.24 kg C m-2 year-1,整個土層貯存有29.8 kg C m-2的碳。各土層有機碳含量為0.55至3.55%,上層較多,向下遞減。剖面各層土壤13C PDB值範圍從-24.0 到-27.3 ‰,與現生植被根系的13C PDB值接近,表現C-3植物有機物的特徵。13C PDB值與土層深度之關係顯示中段部分土層有13C的富集現象,且土壤與森林植物根的13C PDB值有顯著差異。 從截根處理結果顯示,杉木林植物根呼吸佔土壤二氧化碳釋放量的25至50 %。由於根系僅被截斷到表層30公分,可能低估根呼吸對二氧化碳通量之貢獻。扣除根系的生態系自營性呼吸量,估計異營性呼吸量佔總呼吸量以50%計算,杉木林及闊葉林之土壤有機質的更新率為19~51年。另從13C PDB值分析,土層40cm處之根呼吸佔有其土壤二氧化碳產量的85%;配合根系與植被碳化物之13C PDB值顯示土壤表層60 cm內應是二氧化碳生產較活躍之處。zh_TW
dc.description.abstractThe organic carbon and nitrogen contents, values of 13CPDB and 15NAir in soils and litter, and soil respiration were monitored in the Guandaushi Forest Ecosystem, one of the long-term ecological research (LTER) stations in Taiwan. The elevation of station ranges from 700 to 1700 m height above sea level. The primary hardwoods, secondary hardwoods and 35-years-old China-fir are contribution to the stands of watershed. The 13CPDB, 15NAir values of soil, 13CPDB of soil carbon dioxide in coniferous pedon were analyzed. The soil respiration rates and amounts of carbon and nitrogen in soils and litter in three stands were investigated respectively. The sampling sites were located at route cross the watershed of Guandaushi Creek. The amounts of organic carbon were analyzed in laboratory and ranges from 221 to 546 g C m-2 in litter layer, and 18.2 to 41.4 kg C m-2 in soil pedon. The amounts of the organic nitrogen are 4.5~13.9 and 1.62~3.74 kg N m-2 in litter and soil layer, respectively. The C/N ratios of litter and soil layer are 32~79 and 11.3~15.7. The soil respiration rates were monitored in situ by an infrared gas analyzer (IRGA) with dynamic chamber and varied with seasons. The rates of soil respiration in watershed ranged from 9 to 50 mole CO2 m-2 month-1. The annual soil carbon dioxide efflux ranges from 1.24 to 2.35 kg C m-2 yr-1 by long term monitoring. The pedon of 160 cm depth in China-fir stands sites were sampled in levels and analyzed in soil carbon, nitrogen, 13CPDB and 15NAir. The amounts of soil organic carbon were 0.55 to 3.55% in the pedon levels, and decreasingly with the depth. The organic carbon content was 29.8 kg C m-2 in the whole pedon. The soil carbon dioxide efflux was 1.24 kg C m-2 yr-1. The 13CPDB values were from -27.4 to -24.0 ‰ in the horizons, and typical 13C of C-3 plants, near the values of root samples. The relationship between 13CPDB values and depth suggested that the enriched 13C of soils were different from that of root samples in middle levels. The soil respiration is contribution of root metabolism (autotrophic) and microbial decomposition (heterotrophic). The heterotrophic respiration was assessed by the root-exceed process and compared with bared soil respiration rates. The turned over rates of soil carbon stock ranged from 19 to 51 years in the pedon with assumption of 50% of heterotrophic respiration in the steady state. The 85 % of soil carbon dioxide production in 40 cm depth was contributed from root respiration by analysis with 13CPDB values. The analyses of 13CPDB values in root and charcoal samples suggested the carbon dioxide produced actively in the pedon above 60 cm depth.en_US
dc.description.tableofcontents目錄 摘要 目錄 表次 圖次 前言 前人研究 材料與方法 結果與討論 結論參考文獻 附錄 表次 表1、集水池上方之土壤剖面描述 表2、杉木林區土壤剖面描述 表3、各試區A層土壤基本性質 表4、土壤與枯落物之碳氮含量與C/N以及土壤有機碳之周轉率 表5、截根處理之土壤呼吸速率比較 表6、關刀溪台灣杉木林土壤各剖面層次之有機碳含量 表7、關刀溪杉木林根系、土壤及碳化物之碳、氮含量與delta-13C PDB、delat-15N Air值 圖次 圖1、碳同位素在森林各部有機物分佈、循環系統圖 圖2、 關刀溪生態系試驗區採樣位置示意圖 圖3、配合真空瓶操作真空系統示意圖 圖4、二氧化碳低溫純化萃取示意圖 圖3、1995至1997年間關刀溪針葉林之土壤二氧化碳通量 圖6、1995至1997年間關刀溪原生闊葉林之土壤二氧化碳通量 圖7、1995至1997年間關刀溪次生闊葉林之土壤二氧化碳通量 圖8、針葉樹林一日內土壤呼吸通量變化 圖9、一日內土壤呼吸速率與溫度之關係 圖10、關刀溪人工杉木林土壤及根系之delta-13C PDB對delta-15N Air關係圖 圖11、各深度土壤與根系之delta-13C PDB值 圖12、週界空氣與土壤氣體二氧化碳之delta-13C PDB值 附圖1、碳酸鹽標準品置備真空系統 附圖2、有機碳製備二氧化碳之真空操作系統示意圖 附圖3、同位素比值質譜儀系統分析原理示意圖 附圖4、質譜儀操作控制主機面版示意圖 附圖5、質譜儀進樣系統示意圖zh_TW
dc.language.isoen_USzh_TW
dc.publisher土壤環境科學系zh_TW
dc.subjectForest ecosystemen_US
dc.subject森林生態系zh_TW
dc.subjectSoil carbonen_US
dc.subjectSoil carbon dioxide fluxen_US
dc.subjectTurnover rate of soil organic matteren_US
dc.subjectStable carbon isotopeen_US
dc.subjectTaiwan long-term ecological researchen_US
dc.subject土壤碳zh_TW
dc.subject土壤二氧化碳通量zh_TW
dc.subject土壤有機質周轉率zh_TW
dc.subject穩定碳同位素zh_TW
dc.subject台灣長期生態研究zh_TW
dc.title關刀溪森林生態系土壤二氧化碳釋放源之探討zh_TW
dc.titleStudy on the Sources of Soil CO2 Flux in Guandaushi Forest Ecosystemen_US
dc.typeThesis and Dissertationzh_TW
item.languageiso639-1en_US-
item.openairetypeThesis and Dissertation-
item.cerifentitytypePublications-
item.grantfulltextnone-
item.fulltextno fulltext-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
Appears in Collections:土壤環境科學系
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