墾丁國家公園火燒跡地腐植質特性之研究

本研究依排水良好與否，選取墾丁國家公園兩種不同土類火燒跡地之土壤，萃取其腐植質，分析腐植質之化學性質，以探討排水程度不同之土質，其土壤腐植質性狀之異同，並探討石灰質地土壤火燒後，黃酸對生態系中磷肥及鐵、錳、鋅等微量元素運移之影響。所得結果摘要如下：1.排水良好（香蕉灣）之土壤，其腐植質之E_4/E_6值大於排水不良（文淇）者。2.排水不良土壤所萃取之腐植質，其脂肪族吸收峰（2950cm^(-1)）之強度較由排水良好處所萃取者為強。3.芳香族性吸收峰（1640cm^(-1)）之強度為：黃酸（排水良好）＞黃酸（排水不良）＞腐植酸（排水良好）＞腐植酸（排水不良），此結果與E_4/E_6値之趨勢相同。4.芳香族性高，脂肪族性低之黃酸，在土壤剖面有較佳之移動性。5.黃酸對土層中磷之運移與腐植酸類似，扮演著重要角色。土層中之鐵、錳、鋅元素以及磷等，主要是隨著黃酸之移動而運移。

關鍵字

腐植質；黃酸；養分運移；火燒跡地

並列摘要

For studying the effects of humus on the movement of phosphate and microelements after forest fire, the humic substances at well drained and poorly drained sites of Kengting National Park were extracted and analyzed. The results obtained are summarized as follows: 1. Humic substances extracted from well drained soil showed higher EVE, ratio than those from the poorly drained one. 2. Infrared spectra of humic acids GA) showed a sharp band at the frequeney 2950 cm^(-1) (aliphatic C-H stretch), but fulvic acids (FA) showed a sharp band at the frequency 1640 cm^(-1) (C = C stretching vibrations in aliphatic and aromatic compounds). At the frequency 2950 cm^(-1) the band of humic substances derived from poorly drained soil was sharper than that from well drained soil. 3. The sequence for the intensities of the IR absorption band at 1640 cm^(-1) was: FA (well drained)＞ FA (poorly drained)＞ HA (well drained)＞ HA (poorly drained). This tendency was similar to that of E_4/E_6 ratio. 4. Fulvic acids, having more aromatic compounds, showed high mobility in soil profiles. Fulvic acids played an important role in the nutrient transport in poorly drained Bite. 5. Fulvic acids were beneficial to the movement of phosphate and microelements (Fe, Mn,Zn) in soils. Phosphorus cycling in the ecosystem was accelerated and nutrient availability at the calcie soils was also enhanced by fulvic acids.

並列關鍵字

Humus ； Fulvic acids ； Nutrient movement ； Burned site

國際替代計量

墾丁國家公園火燒跡地腐植質特性之研究

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