DOI: 10.1111/gcb.13453
论文题名: Deadwood stocks increase with selective logging and large tree frequency in Gabon
作者: Carlson B.S. ; Koerner S.E. ; Medjibe V.P. ; White L.J.T. ; Poulsen J.R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期: 4 起始页码: 1648
结束页码: 1660
语种: 英语
英文关键词: aboveground biomass (AGB)
; carbon storage
; coarse woody debris (CWD)
; deadwood
; necromass
; tropical forest
英文摘要: Deadwood is a major component of aboveground biomass (AGB) in tropical forests and is important as habitat and for nutrient cycling and carbon storage. With deforestation and degradation taking place throughout the tropics, improved understanding of the magnitude and spatial variation in deadwood is vital for the development of regional and global carbon budgets. However, this potentially important carbon pool is poorly quantified in Afrotropical forests and the regional drivers of deadwood stocks are unknown. In the first large-scale study of deadwood in Central Africa, we quantified stocks in 47 forest sites across Gabon and evaluated the effects of disturbance (logging), forest structure variables (live AGB, wood density, abundance of large trees), and abiotic variables (temperature, precipitation, seasonality). Average deadwood stocks (measured as necromass, the biomass of deadwood) were 65 Mg ha−1 or 23% of live AGB. Deadwood stocks varied spatially with disturbance and forest structure, but not abiotic variables. Deadwood stocks increased significantly with logging (+38 Mg ha−1) and the abundance of large trees (+2.4 Mg ha−1 for every tree >60 cm dbh). Gabon holds 0.74 Pg C, or 21% of total aboveground carbon in deadwood, a threefold increase over previous estimates. Importantly, deadwood densities in Gabon are comparable to those in the Neotropics and respond similarly to logging, but represent a lower proportion of live AGB (median of 18% in Gabon compared to 26% in the Neotropics). In forest carbon accounting, necromass is often assumed to be a constant proportion (9%) of biomass, but in humid tropical forests this ratio varies from 2% in undisturbed forest to 300% in logged forest. Because logging significantly increases the deadwood carbon pool, estimates of tropical forest carbon should at a minimum use different ratios for logged (mean of 30%) and unlogged forests (mean of 18%). © 2016 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60988
Appears in Collections: 影响、适应和脆弱性
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作者单位: Nicholas School of the Environment, Duke University, PO Box 90328, Durham, NC, United States; Agence Nationale des Parcs Nationaux, Batterie IV, Libreville, Gabon; Institut de Recherche en Ecologie Tropicale, Libreville, Gabon; African Forest Ecology Group, School of Natural Sciences, University of Stirling, Stirling, United Kingdom
Recommended Citation:
Carlson B.S.,Koerner S.E.,Medjibe V.P.,et al. Deadwood stocks increase with selective logging and large tree frequency in Gabon[J]. Global Change Biology,2017-01-01,23(4)