DOI: 10.1016/j.quascirev.2016.01.003
Scopus记录号: 2-s2.0-84955318302
论文题名: Can grass phytoliths and indices be relied on during vegetation and climate interpretations in the eastern Himalayas? Studies from Darjeeling and Arunachal Pradesh, India
作者: Biswas O. ; Ghosh R. ; Paruya D.K. ; Mukherjee B. ; Thapa K.K. ; Bera S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 134 起始页码: 114
结束页码: 132
语种: 英语
英文关键词: Climate reconstruction
; Eastern Himalayas
; Grass
; Phytoliths
; Tropical - Alpine zone
Scopus关键词: Climate change
; Discriminant analysis
; Forestry
; Plants (botany)
; Reliability analysis
; Soils
; Canonical Correspondence Analysis
; Climate reconstruction
; Grass
; Himalayas
; Linear discriminant analysis
; Past climate conditions
; Phytoliths
; Vegetation response
; Vegetation
; Poaceae
英文摘要: While documenting the vegetation response to climatic changes in mountains, the use of grass phytolith data relies on the ability of phytolith assemblages or indices to differentiate the elevationally stratified vegetation zones. To infer the potential and limitations of grass phytolith assemblages and indices to reconstruct vegetation vis-à-vis climate in the Himalayan mountain regions, we analyzed phytolith assemblages from 66 dominant grasses and 153 surface soils from four different forest types along the c. 130-4000 m a.s.l. elevation gradients in the Darjeeling and Arunachal Himalayas. Grass short cell phytolith assemblages from modern grasses show significant variability with rising elevation. To test the reliability of the above observation, phytoliths from the soil samples were subjected to linear discriminant analysis (DA). DA classified 85.3% and 92.3% of the sites to their correct forest zones in the Darjeeling and Arunachal Himalayas respectively. Relative abundance of bilobate, cross, short saddle, plateau saddle, rondel and trapeziform types allow discrimination of the phytolith assemblage along the elevation gradient. Canonical correspondence analysis (CCA) on the soil phytolith data further revealed their relationships with the climatic variables. Temperature and evapotranspiration were found to be the most influential for differential distribution of grass phytolith assemblages with rising elevation in the eastern Himalayas. We also tested the reliability of phytolith indices (Ic, Iph and Fs) for tracing the dominance of different grass subfamilies in the eastern Himalayas. Ic proved to be most reliable in discriminating C3/C4 grass along the elevation gradient while Iph and Fs proved to be less reliable. We observed that in the monsoon dominated eastern Himalayas, a little adjustment in Ic index may enhance the accuracy of interpretations. In future studies more precise identification of phytolith sub-types from additional sites in the eastern Himalayas may further improve our interpretations related to past climate condition. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59683
Appears in Collections: 过去全球变化的重建
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作者单位: Centre of Advanced Study, Palaeobotany-Palynology Laboratory, Department of Botany, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, India; Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow, India; Department of Botany, Dinhata College, India
Recommended Citation:
Biswas O.,Ghosh R.,Paruya D.K.,et al. Can grass phytoliths and indices be relied on during vegetation and climate interpretations in the eastern Himalayas? Studies from Darjeeling and Arunachal Pradesh, India[J]. Quaternary Science Reviews,2016-01-01,134