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Quantifying the factors affecting wood decomposition across a tropical forest disturbance gradient
Dossa, Gbadamassi G. O.; Paudel, Ekananda4; Schaefer, Douglas; Zhang, Jiao-Lin; Cao, Kun-Fang; Xu, Jian-Chu; Harrison, Rhett D.
2020
Source PublicationFOREST ECOLOGY AND MANAGEMENT
ISSN1872-7042
Volume468Issue:xPages:-
Abstract

Woody debris represents a substantial reservoir of carbon in forests. Disentangling the effects of factors affecting wood decomposition rates is therefore important. We examined the abiotic and biotic factors affecting wood decomposition across a disturbance gradient from mature forest to open land in a tropical montane site in Xishuangbanna, SW China. Wood logs (n = 280) of two native species with contrasting wood specific gravity (WSG), Castanopsis mekongensis (0.75) and Litsea cubeba (0.42), were exposed on the ground for three years. For each log, WSG was monitored at intervals by taking cores from top-half (up) and bottom-half (down) of the log. Mass loss was measured at the end of the experiment. WSG loss rates were similar across the disturbance gradient and the species effect varied with core position. For Castanopsis, which had higher initial WSG and wood N concentration and much thicker bark, up-cores had consistently higher WSG loss over the study period. This species also had substantially higher WSG loss for up-cores, but interspecific difference among down-cores was small. For mass loss, there was a complex interaction between species, habitat and the presence of termites. Litsea with low initial WSG experienced approximately two-fold higher mass loss in the absence of termites, but the difference between species was smaller in the presence of termites. Both species experienced higher mass loss in open habitats than in forests, but the termite effect was smaller in open habitats especially for Litsea. There was no interspecific difference in susceptibility to termite infestation, but infestation rates were higher in regenerating forests and open land than in mature forest. WSG loss explained 0% and 19% of mass loss variation in Listea and Castanopsis, respectively, in absence of termites and 0% for both in the presence of termites. Afterlife effects of wood functional traits interact with abiotic conditions and decomposition processes (microbial decomposition, macro-organisms (termites), photo-degradation) in a complex manner to determine wood decomposition rates. WSG loss is not a reliable predictor of mass loss. These results have important implications for understanding the carbon cycle in tropical landscapes that are undergoing anthropogenic disturbance.

KeywordBulong nature reserve Carbon cycle Coarse woody debris Degradation Landscape Mengsong Suspended dead wood Termites Wood density Wood specific gravity
Subject AreaForestry
DOI10.1016/j.foreco.2020.118166
Indexed BySCI
Language英语
WOS IDWOS:000533503100018
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/11693
Collection植物生理生态研究组
Affiliation1.Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Yunnan, Peoples R China
2.Chinese Acad Sci, Ctr Plant Ecol, Core Bot Gardens, Mengla 666303, Yunnan, Peoples R China
3.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia KLPB, Kunming 650201, Yunnan, Peoples R China
4.World Agroforestry Ctr, East & Cent Asia Reg Off, Kunming 650201, Yunnan, Peoples R China
5.Nepal Acad Sci & Technol, Khumaltar, Lalitpur, Nepal
6.Guangxi Univ, State Key Lab Conservat & Utilizat Subtrop Agrobi, Plant Ecophysiol & Evolut Grp, Nanning 530004, Guangxi, Peoples R China
7.Guangxi Univ, Coll Forestry, Nanning 530004, Guangxi, Peoples R China
8.Harrison, Rhett D.] World Agroforestry Ctr, 13 Elm Rd, Lusaka, Zambia
Recommended Citation
GB/T 7714
Dossa, Gbadamassi G. O.,Paudel, Ekananda,Schaefer, Douglas,et al. Quantifying the factors affecting wood decomposition across a tropical forest disturbance gradient[J]. FOREST ECOLOGY AND MANAGEMENT,2020,468(x):-.
APA Dossa, Gbadamassi G. O..,Paudel, Ekananda.,Schaefer, Douglas.,Zhang, Jiao-Lin.,Cao, Kun-Fang.,...&Harrison, Rhett D..(2020).Quantifying the factors affecting wood decomposition across a tropical forest disturbance gradient.FOREST ECOLOGY AND MANAGEMENT,468(x),-.
MLA Dossa, Gbadamassi G. O.,et al."Quantifying the factors affecting wood decomposition across a tropical forest disturbance gradient".FOREST ECOLOGY AND MANAGEMENT 468.x(2020):-.
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