| The tree species identification of ancient buried wood and selected physico-chemical properties of the ancient buried and recent Phoebe Zhennan wood, collected in Sichuan Ya’an, were studied in this thesis. Through on-the-spot investigation and with the aid of related literature, this study did a systematic research on ancient buried woods’origins, trees species identification of ancient buried wood and chemical components and surface color of recent and ancient buried Phoebe Zhennan wood. Results of this investigation were shown as following:1. Origins of ancient buried wood:Ancient buried woods were developed or carbonized from trees buried into ancient river bed or the other low grand areas by forces such as geological disaster naturally.2. Identification of tree species of ancient buried wood:176 samples of buried wood in Yaan were identified using macroscopic and microscopic methods. The identification results showed that tree species of 176 buried wood samples including Phoebe Nees which was 18.75% of the total number of samples; Machilus pauhoi which was 8,4.5%of the total number of samples; Machilus pingii which was 12,6.8% of the total number of samples; Cinnamomum camphora which was 15,8.5% of the total number of samples; Litsea baviensis which was 4,2.3% of the total number of samples; Lindera kwangtungensis which was 1.14%of the total number of samples. Lindera Flavinervia which was 2,1.14% of the total number of samples.Cyclobaianopsis glauca which was 16, 9.1% of the total number of samples. Castanopsis hystrix which was 8,4.5% of the total number of samples.Castanopsis eyrei which was 4,2.3%of the total number of samples.Schima superba which was 6,3.4% of the total number of samples. Idesia Polycarpa which was 28,15.9%of the total number of samples. Styrax hypoglauca which was 4,2.3% of the total number of samples. Pterostyrax corymbosa which was 14,7.9% of the total number of samples. Dipteronia sinensis which was 7,3.98% of the total number of samples. Rhoipteleachiliantha which was 12,6.8%of the total number of samples. Betula sp.which was 1,0.69% of the total number of samples.3. Characteristics of ancient buried wood:(1)Most of the tress are characterized by aroma or strong corrosion and insect resistance or high air-dry density, a large proportion of whom are Lauraceae and Fagaceae in broadleaf timber; (2)The aesthetic elements of refining and mining can be applied to the field of decorative design; (3) The basic organizational structure had not changed, while the cell cavity was infiltrated by a lot of inorganic sediments; (4)The colours of ancient buried wood include brown, reddish brown, beige or dark brown..4. Investigation on chemical components and surface color of the ancient buried and recent Phoebe Zhennan wood:The wed chemical method and FTIR were used to analyze the chemical components, and the CIE LAB system was used to estimate the surface color both of the recent and ancient buried Zhennan wood. The results indicated that the hot-water extractive, toluene-alcohol extractive,1%NaOH solubility, ash content of ancient Zhennan buried wood were significantly lower than that for recent ones, and the reduction were 61.91%,38.50%,43.14%,22.96%, respectively. The alpha cellulose, hemicelluloses and acid-insoluble lignin content of ancient buried Zhennan wood were 35.00%,17.86%, 38.80%, respectively. Compared with recent Zhennan wood, significant reductions of hemicellulose in the ancient buried Zhennan wood.The ancient buried and recent Phoebe Zhennan wood collected from Sichuan province, were comparatively investigated on chemical components and surface color to provide a basic theories of ancient buried wood formation. |
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