DOI: 10.1007/s10533-017-0396-8
Scopus记录号: 2-s2.0-85032904342
论文题名: Shrub-encroachment induced alterations in input chemistry and soil microbial community affect topsoil organic carbon in an Inner Mongolian grassland
作者: Zhou L. ; Li H. ; Shen H. ; Xu Y. ; Wang Y. ; Xing A. ; Fang J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 136, 期: 3 起始页码: 311
结束页码: 324
语种: 英语
英文关键词: Biomarkers
; Coverage gradient
; Legume shrub
; Plant-soil feedback
; Shrub encroachment
Scopus关键词: bacterium
; biogeochemistry
; biomarker
; chemical composition
; environmental gradient
; fatty acid
; fungus
; grassland
; grassland soil
; microbial community
; organic carbon
; range expansion
; shrub
; soil microorganism
; soil organic matter
; soil-vegetation interaction
; topsoil
; vegetation cover
; China
; Nei Monggol
; Bacteria (microorganisms)
; Caragana microphylla
; Negibacteria
; Posibacteria
英文摘要: Shrub encroachment frequently occurs in arid and semi-arid grasslands worldwide and affects the regional carbon balance. Many previous studies have revealed the effects of shrub encroachment on bulk carbon content of grasslands, but molecular evidence is surprisingly lacking. In this study, we examined the chemical composition of plant tissues and soil organic carbon (SOC), and soil microbial communities to identify the effects of shrub (Caragana microphylla) encroachment on SOC storage in the top layer (0–10 cm) along a gradient of natural shrub cover in the grasslands of Inner Mongolia. We found that SOC in the shrub patches was derived mainly from leaves, whereas SOC in the grassy matrix was composed of a mixture of fresh root- and leaf-derived compounds. Compared with pure grassland, the SOC decreased by 29% in the shrub-encroached grasslands (SEGs), and this decrease was enhanced by increasing shrub cover. We also found that free lipids and lignin-derived phenols increased while the ratios of ω-C18/∑C18 and suberin/cutin decreased with increasing shrub cover. In addition, the ratios of fungal to bacterial phospholipid fatty acids (PLFAs) and gram-negative to gram-positive bacterial PLFAs decreased with increasing shrub cover. These results indicate that the encroachment of nitrogen-rich legume shrubs can lead to carbon loss by altering the chemical composition of plant inputs as well as the soil microbial community in grassland ecosystems. © 2017, Springer International Publishing AG, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83205
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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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; Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai, China; College of Urban and Environmental Sciences, and Key Laboratory of Earth Surface Processes of the Ministry of Education, Peking University, Beijing, China
Recommended Citation:
Zhou L.,Li H.,Shen H.,et al. Shrub-encroachment induced alterations in input chemistry and soil microbial community affect topsoil organic carbon in an Inner Mongolian grassland[J]. Biogeochemistry,2017-01-01,136(3)