Evaluations And Studies On Variation Of Wood Chemistry Characteristics Of Ginkgo Biloba L. Clones

Chemical constituents, thermal kinetics and corrosion resistance of 30 Ginkgo Biloba L.clones which from Tancheng county of Shandong province were studied in this text, variance Analysis, multiple comparison, cluster analysis and correlation analysis were applied to integrated studying of the variability and relativity of wood chemical components, thermodynamic performance, and corrosion resistance among different Ginkgo Biloba L.clones, The results obtained were as follows:1,Wood chemical componentsHot water extractive content, lignin content, cellulose content reached extremely significant level among Ginkgo Biloba L. clones as well as the difference of the same index among five kinds of Ginkgo Biloba L.. Cool water extractive content, 1%NaOH extractive content, and alcohol benzene extractive content reached extremely significant level in different germplasm resources. There were dominant differences for alcohol benzene extractive content and lignin content among five kinds of Ginkgo Biloba L., while no obvious differences among the cool water extractive content, hot water extractive content, 1%NaOH extractive content, and cellulose content. Cluster analysis was applied to analyzing 6 chemical index: cool water extractive content, hot water extractive content, 1%NaOH extractive content, alcohol benzene extractive content, lignin content and cellulose content. The results showed that in all Ginkgo Biloba L. germplasm, comprehensive chemical properties of 203#, 210#, 402# were the best, which had higher content of cellulose and lignin, but lower content of alcohol benzene extractive, cool water extractive and hot water extractive, while the 4 clones: 202#, 208#, 212#, 229# were the poorest, which had lower content of lignin and cellulose.2,Wood Pyrolysis kinetics characteristicsThe pyrolysis characteristics such as temperature change, weight loss rate, initial temperature in pyrolysis, and so on of the wood of Ginkgo Biloba L. were studied. The initial temperature distribution in pyrolysis of Ginkgo Biloba L. clones was from 165 to 227, which were higher than coniferous and hard. The weight loss rate distributed from 65% to 72%, and the weight loss interval was shorter , which was relatively serious. The result of multiple comparison showed that there was a higher correlation between the initial temperature in pyrolysis of the wood of Ginkgo Biloba L. and lignin content and cellulose content.3,Wood corrosion resistance propertiesComparison of corrosion degree in all Ginkgo Biloba L. germplasm showed that all Ginkgo Biloba L. wood had better corrosion resistance with distributed degree from 7% to 16%. There were dominant differences of all clones, 303#,210#,203# were the best corrosion resistance types, and the corrosion degree was about 7%, while 107#,212# were the poorest ones with corrosion degree about 15%.Grey correlation analysis was applied to analyzing the chemical composition contents and wood corrosion degree of Ginkgo Biloba L. The results showed that lignin content and cellulose content had the strongest correlation coefficient (r=0.9552, P<0.01), while the alcohol benzene extractive content and lignin content had the weakest correlation coefficient (r=0.3238, P<0.01). Cellulose content was most closely correlated with the corrosion resistance, followed by lignin content, 1%NaOH extractive content, hot water extractive content, and the alcohol benzene extractive content, while cool water extractive content was least closely correlated with the corrosion resistance.2 excellent furniture timber clones (210# and 203#) were elected based on the comprehensive evaluating on Ginkgo Biloba L. clones with 6 indexes, hoping to provide reference about chemical properties for breeding standards of excellent furniture timber.