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Journal Article Moso bamboo and japanese cedar seedlings differently affected soil N_(2)O emissions

Journal of Plant Ecology 2022年第2期15卷 277-285页

作者： Haifu Fang Yu Gao Qiang Zhang Lili Ma Baihui Wang Nasir Shad Wenping Deng Xiaojun Liu Yuanqiu Liu Ling Zhang Jiangxi Key Laboratory of Silviculture College of ForestryJiangxi Agricultural UniversityNanchang 330045China

Moso bamboo expansions into japanese cedar forests are *** expansion effects on soil nitrous oxide(N_(2)O)emissions have not been thoroughly understood,and the underlying microbial mechanisms remain *** studied bacterial and fungal contribution to soil N_(2)O emissions under moso bamboo or japanese cedar by applying bacterial or fungal inhibitors using streptomycin and iprodione,*** N_(2)O emissions were measured and the relative contribution of bacteria and fungi to soil N_(2)O emissions was calculated.N_(2)O emission from soil with moso bamboo was significantly higher than under japanese *** with control,bacterial or fungal inhibitor or their combination decreased N_(2)O emissions,indicating substantial contribution of microbial activities to N_(2)O ***,the relative contribution of bacteria and fungi to N_(2)O emissions was not affected by *** organic carbon,total and ammonium nitrogen were lower in soil under moso bamboo than japanese cedar,suggesting faster microbial decomposition under moso *** inhibitor and plants interactively affected soil pH,total phosphorus and ammonium nitrogen,while bacterial inhibitor and plants interactively affected total nitrogen,indicating substantial dependence of effects by microbial communities on plant *** bamboo and japanese cedar differed in their effects on soil N_(2)O emissions with higher emissions under moso *** of N_(2)O emission under moso bamboo might occur due to higher nitrogen mineralization and subsequent denitrification induced by high root *** results highlight the need to consider the effect of species shifts on N_(2)O emissions in forests.

关键词： microbial inhibitor moso bamboo expansion japanese cedar N_(2)O emission

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Non-Contact Velocity Measurement of japanese cedar Columns Using Air-Coupled Ultrasonics

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World Journal of Engineering and Technology 2016年第1期4卷 45-50页

作者： Masumi Hasegawa Misaki Mori Junji Matsumura Department of Agro-Environmental Science Faculty of Agriculture Kyushu University Fukuoka Japan Graduate School of Bioresource and Bioenvironmental Science Kyushu University Fukuoka Japan

The ultrasonic wave velocities of japanese cedar columns were measured using a non-contact method. An air-coupled ultrasonic wave was propagated through the axial and lateral directions of wood. The velocities in the axial direction (VL) showed the minimum values around the pith. The averaged VL increased from 3600 m/s towards the outside of measurement area and attained the maximum values (=4010 m/s). The velocities in the lateral direction (VRT ) showed no tendency among measurement points. The averaged VRT was 1450 m/s. The velocities obtained using the non-contact method showed a significant positive relationship with those obtained using the contact method. The averaged ratio of VL to VRT was measured to be approximately 2.2 to 2.8. These ratios were in agreement with those from a contact method. These findings suggest that it is possible to measure the velocity in japanese cedar columns with the non-contact method by using air-coupled ultrasonics.

关键词： Air-Coupled Ultrasonics Velocity Non-Contact Method Nodestructive Evaluation japanese cedar

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FLAME RETARDANCY OF PAULOWNIA WOOD AND ITS MECHANISM

FLAME RETARDANCY OF PAULOWNIA WOOD AND ITS MECHANISM

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作者： Juhachi Oda Graduate School of Natural Science ＆ Technology Kanazawa University

＜正＞Paulownia wood is a special kind of wood material with excellent flame retardancy. It has been commonly used to make wardrobes for a long time. In this research, the flame retardant property of paulownia wood has been verified by combustion experiments and thermal conductivity measurements. The structure and tissue of the material have been analyzed by scanner electronic microscope and other methods. The result shows that the cell tissue of paulownia wood is very porous, similar to the structure of a honeycomb. It can be easily carbonized when heated. Because paulownia wood contains few lignin, it generates very little combustible gas when heated. Furthermore, viewing from the radial section, the vessel structure of paulownia wood is very big and independent, compared to cedar wood, which has a thin and consecutive vessel structure. Oxygen is not sufficiently supplied in such a structure of paulownia wood. Thus, it is difficult to ignite, and only carbonized when heated. Generally speaking, the thermal conductivity of the carbonization layer is lower than that of the wood material, which is the reason why a wardrobe made of paulownia wood can protect kimono from fire.

关键词： Biomechanics Paulownia wood Flame retardancy japanese cedar

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