DOI: 10.1111/gcb.12536
论文题名: Increased topsoil carbon stock across China's forests
作者: Yang Y. ; Li P. ; Ding J. ; Zhao X. ; Ma W. ; Ji C. ; Fang J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 8 起始页码: 2687
结束页码: 2696
语种: 英语
英文关键词: Artificial neural network
; Carbon cycle
; Carbon-climate feedback
; Forest ecosystems
; Global change
; Soil inventory
; Soil organic carbon
Scopus关键词: artificial neural network
; carbon cycle
; carbon sequestration
; climate change
; climate feedback
; forest ecosystem
; global change
; soil carbon
; topsoil
; China
; carbon
; soil
; artificial neural network
; carbon sequestration
; chemistry
; China
; climate change
; forest
; soil
; Carbon
; Carbon Sequestration
; China
; Climate Change
; Forests
; Neural Networks (Computer)
; Soil
英文摘要: Biomass carbon accumulation in forest ecosystems is a widespread phenomenon at both regional and global scales. However, as coupled carbon-climate models predicted, a positive feedback could be triggered if accelerated soil carbon decomposition offsets enhanced vegetation growth under a warming climate. It is thus crucial to reveal whether and how soil carbon stock in forest ecosystems has changed over recent decades. However, large-scale changes in soil carbon stock across forest ecosystems have not yet been carefully examined at both regional and global scales, which have been widely perceived as a big bottleneck in untangling carbon-climate feedback. Using newly developed database and sophisticated data mining approach, here we evaluated temporal changes in topsoil carbon stock across major forest ecosystem in China and analysed potential drivers in soil carbon dynamics over broad geographical scale. Our results indicated that topsoil carbon stock increased significantly within all of five major forest types during the period of 1980s-2000s, with an overall rate of 20.0 g C m-2 yr-1 (95% confidence interval, 14.1-25.5). The magnitude of soil carbon accumulation across coniferous forests and coniferous/broadleaved mixed forests exhibited meaningful increases with both mean annual temperature and precipitation. Moreover, soil carbon dynamics across these forest ecosystems were positively associated with clay content, with a larger amount of SOC accumulation occurring in fine-textured soils. In contrast, changes in soil carbon stock across broadleaved forests were insensitive to either climatic or edaphic variables. Overall, these results suggest that soil carbon accumulation does not counteract vegetation carbon sequestration across China's forest ecosystems. The combination of soil carbon accumulation and vegetation carbon sequestration triggers a negative feedback to climate warming, rather than a positive feedback predicted by coupled carbon-climate models. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62189
Appears in Collections: 影响、适应和脆弱性
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作者单位: State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China; Department of Ecology, Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing, 100871, China; University of Chinese Academy of Sciences, Beijing, 100049, China; College of Life Science, Inner Mongolia University, Hohhot, 010021, China
Recommended Citation:
Yang Y.,Li P.,Ding J.,et al. Increased topsoil carbon stock across China's forests[J]. Global Change Biology,2014-01-01,20(8)