The effects of thinning on the decay rate of coarse woody debris and succession of deadwood-inhabiting microbes.

in International Symposium (Abstract oral presentation), 國際研討會(摘要口頭發表)
標題The effects of thinning on the decay rate of coarse woody debris and succession of deadwood-inhabiting microbes.
AuthorsYu-Ting Wu, 吳羽婷, Ya-Chien Lin 林雅倩, Kuo-Ting Cheng 鄭國廷, & Chaur-Tzuhn Chen 陳朝圳
會議名稱3rd Thunen Symposium on Soil Metagenomics
出版日期Dec 14 2016 12:0

Wood, as the important structural component in forest ecosystems is the major organic carbon pool. Coarse woody debris (CWD) namely deadwood, provides plentiful nutrient sources and shelter for organisms, primarily fungi and saproxylic insects. However, some studies currently revealed that deadwood inhabiting bacteria has emerged as an important group taking part in the CWD decomposition, but the interaction between fungi and bacteria is still far from known. Apparently, dead wood is an important biodiversity of hotspot in forest ecosystems. Deadwood decay process is also determined by tree species, owing to the difference in wood chemical composition (C, N, P, cellulose, semicellulose and lignin), wood morphology and microbial adaptions to interspecies differences in active tree defense mechanisms. In addition, selection cutting is considered to be a promising silvicultural technique for maintaining forest biodiversity which influences wood decomposer and decay rate. The deadwood decay and the community structure of deadwood decomposer related studies have been mostly conducted in boreal and temperate climate regions, data from low-latitude regions are urgently required for wood turnover and the effect that influences wood decompostion for managing global vegetation climate models. Therefore, a dominant tree species Machilus thunbergii which have quite high wood density (> 0.60 g/cm3) was chosen for the comparative study at Tajen Forest Station (22°27’N120°82’E, tropical area with the mean annual temperature of 25°C and precipitation of 2400mm) where has a 1-ha experimental site which is divided into a total of 20 plots with five different silvicultural management (cutting of 0, 20, 40, 60 and 80%). The objectives and hypothesis of this study are: 1. The dynamic fungal and bacterial community structures will be detected at different decayed stages (from fresh logs to completely decayed) of wood Machilus thunbergii using massively parallel pyrosequencing. The results will provide a comprehensive insight into the succession of fungi and bacteria which inhabit in deadwood of M. thunbergii during the decomposition. 2. To explore if the thinning management has effect on the succession of fungi and bacteria, dwelling in deadwood and as well as the CWD decomposition rate.

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