DOI: 10.1111/1365-2745.13298
论文题名: Shrub encroachment decreases soil inorganic carbon stocks in Mongolian grasslands
作者: Liu S. ; Zhou L. ; Li H. ; Zhao X. ; Yang Y. ; Zhu Y. ; Hu H. ; Chen L. ; Zhang P. ; Shen H. ; Fang J.
刊名: Journal of Ecology
ISSN: 220477
出版年: 2020
卷: 108, 期: 2 语种: 英语
英文关键词: carbon budget
; carbon source
; shrub encroachment
; soil acidification
; soil inorganic carbon
; temperate grassland
Scopus关键词: carbon balance
; carbon sequestration
; field survey
; grassland
; inorganic carbon
; organic carbon
; shrub
; terrestrial ecosystem
; China
; Nei Monggol
英文摘要: Widespread shrub encroachment in global drylands may increase plant biomass and change soil organic carbon stocks of grassland ecosystems. However, the response of soil inorganic carbon (SIC), which is a major component of dryland carbon pools, to this vegetation shift remains unknown. We conducted a systematic field survey in 75 pairs of shrub-encroached grassland (SEG) and control plots at 25 sites in the grasslands of the Inner Mongolia Plateau to evaluate how shrub encroachment affects SIC density (SICD) in these ecosystems. We found that shrub encroachment significantly reduced SICD in the upper 100 cm (3.85 vs. 4.74 kg C m−2, p <.05), especially in the subsurface soil (20–50 cm layer). The magnitude of SICD changes was related to the change in soil pH, shrub patch size and initial SICD, reflecting that the reduction in SICD might be attributed to the shrub encroachment-related soil acidification. Our results also revealed that the lost SIC was mainly released into the atmosphere rather than redistributed into deeper soil layers. Synthesis. We provide the first evidence for the soil acidification-induced SIC loss caused by shrub encroachment. Our findings highlight the non-negligible role of SIC dynamics in the C budget of SEG ecosystems and the need to consider these dynamics in terrestrial C cycle research. © 2019 The Authors. Journal of Ecology © 2019 British Ecological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159077
Appears in Collections: 气候变化与战略
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作者单位: State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China; Institute of Ecology, College of Urban and Environment, Peking University, Beijing, China; Key Laboratory of Earth Surface Processes of the Ministry of Education, Peking University, Beijing, China; Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot, China
Recommended Citation:
Liu S.,Zhou L.,Li H.,et al. Shrub encroachment decreases soil inorganic carbon stocks in Mongolian grasslands[J]. Journal of Ecology,2020-01-01,108(2)