文献类型：期刊文献

英文题名：Dynamics and speciation of organic carbon during decomposition of leaf litter and fine roots in four subtropical plantations of China

作者：Wang, Hui[1] Liu, Shirong[1] Wang, Jingxin[2] Shi, Zuomin[1] Lu, Lihua[3] Guo, Wenfu[3] Jia, Hongyan[3] Cai, Daoxiong[3]

通信作者：Liu, SR[1]

机构：[1]Chinese Acad Forestry, Inst Forest Ecol Environm & Protect, Chinas State Forestry Adm, Key Lab Forest Ecol & Environm, Beijing 100091, Peoples R China;[2]W Virginia Univ, Div Forestry & Nat Resources, Morgantown, WV 26506 USA;[3]Chinese Acad Forestry, Expt Ctr Trop Forestry, Pingxiang 532600, Guangxi, Peoples R China

年份：2013

卷号：300

起止页码：43-52

外文期刊名：FOREST ECOLOGY AND MANAGEMENT

收录：;EI(收录号：20132116364845);Scopus(收录号：2-s2.0-84877919682);WOS:【SCI-EXPANDED(收录号:WOS:000320425100006)】；

基金：We gratefully acknowledge the support of Xueman Huang, Yuan Wen, Jia Xu, Pizheng Hong and Riming He, Hai Chen, Zhongguo Li, Angang Ming, Hong long Yu and Lu Zheng of Guangxi Youyiguan Forest Ecosystem Research Station for their assistance in field sampling and data collection. This study was funded by the Ministry of Finance (201104006 and 200804001), China's National Natural Science Foundation (31290223 and 31100380) and the Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry (CAFRIFEEP201104) and the Ministry of Science and Technology (2011CB403205 and 2012BAD22B01), and was also supported by CFERN & GENE Award Funds on Ecological Paper.

语种：英文

外文关键词：Litter decomposition; Solid-state C-13 CPMAS NMR spectroscopy; Carbon dynamics; Microclimate; Plant traits

摘要：Plant litter and fine roots turnover are important carbon (C) inputs to soil and a direct emission source of CO2 to the atmosphere. C dynamics during litter decomposition provide an insight into C flow in soils. To quantitatively assess how decomposition processes vary with litter types, the solid-state C-13 nuclear magnetic resonance spectroscopy with cross-polarization and magic-angle spinning (CPMAS-NMR) technique was applied to analyze the organic C dynamics of conifer (Pinus massoniana) and broadleaf (Castanopsis hystrix, Michelia macclurei and Mytilaria laosensis) leaf litter and fine roots which had degraded during one year litterbag experiment in four subtropical plantations of China. The results were used to estimate decomposition rates of different C types and compositional changes of leaf litter and fine roots during decomposition. The mass loss rates of different C fractions during decomposition varied significantly between litter types. Site environment and initial litter quality played more critical roles in regulating decomposition of fine roots than of leaf litter. The significant changes in the proportion of C forms and degree of humification occurred during leaf litter decomposition, but not during fine roots decomposition. The proportions of alkyl C and carbonyl C and alkyl/O-alkyl C ratio varied with leaf litter types, with an increase for the proportion of alkyl C and alkyl/O-alkyl C ratio in broadleaf leaf litters and an enhanced trend for the proportion of carbonyl C for P. massoniana. The results suggest that the patterns and main controlling factors of litter C compositional change during decomposition differed between above- and belowground, and the dynamics of leaf litter C fractions during decomposition differed between conifer and broadleaf species. The findings of litter C compositional decomposition of the main tree species in this study could contribute to the accurate estimation of soil C sequestration in subtropical plantation ecosystems. (c) 2012 Elsevier B.V. All rights reserved.