干旱区生态环境知识资源中心(Arid): Vegetation History in a Peat Succession Over the Past 8,000 years in the ISM-Controlled Kedarnath Region, Garhwal Himalaya: Reconstruction Using Molecular Fossils

Arid

DOI	10.3389/feart.2021.703362
	Vegetation History in a Peat Succession Over the Past 8,000 years in the ISM-Controlled Kedarnath Region, Garhwal Himalaya: Reconstruction Using Molecular Fossils
	Bhattacharya, Sharmila; Kishor, Harsh; Ankit, Yadav; Mishra, Praveen K.; Srivastava, Pradeep
通讯作者	Bhattacharya, S (corresponding author), Indian Inst Sci Educ & Res Mohali, Dept Earth & Environm Sci, Mohali, India.
来源期刊	FRONTIERS IN EARTH SCIENCE
EISSN	2296-6463
出版年	2021
卷号	9
英文摘要	The Holocene epoch has witnessed several natural climate variations and these are well encoded in various geological archives. The present biomarker investigation in conjunction with previously published multi-proxy records was applied to reconstruct organic matter (OM) sources forming the peat succession spanning the last 8000 cal yr BP and shift in hydrological conditions from the Kedarnath region, Garhwal Himalaya. Intensified monsoon prevailed from similar to 7515 until similar to 2300 cal yr BP but with reversal to transient arid period particularly between similar to 5200 and similar to 3600 cal yr BP as revealed by the variability in n-C-23/n-C-31, ACL (average chain length of n-alkanes) and P (aq) (P-aqueous) values. A prolonged arid phase is recognizable during the interval between similar to 2200 and similar to 370 cal yr BP suggested by the n-alkane proxies. Regional scale heterogeneity in the monsoonal pattern is known in the studied temporal range of mid to late Holocene across the Indian subcontinent that is probably a result of complex climate dynamics, sensitivity of proxies and impact of teleconnections. The biomarker signatures deduced from gas chromatography mass spectrometry (GCMS) analysis are suggestive of a mixed biotic input that includes prokaryotes, Sphagnum spp. and gymnosperm flora. The mid chain alkanes viz. n-C-23 and n-C-25 denote the presence of typical peat forming Sphagnum moss that preferentially grows in humid and waterlogged conditions. Diterpane marker such as ent-kaurane indicates contribution of gymnosperms, whereas the hopanes are signatures of microbial input. The preservation of organic matter is attributed to little microbial degradation in a largely suboxic depositional environment. Our study strengthens the applicability of organic geochemical proxies for the reconstruction of past climate history and indicates their suitability for use on longer timescales given the high preservation potential of the molecular remains.
英文关键词	lipid biomarkers peat vegetation shift Kedarnath Garhwal Himalaya palaeohydrological conditions
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000698803500001
WOS关键词	INDIAN-SUMMER MONSOON ; N-ALKANE DISTRIBUTIONS ; PALEOCLIMATE RECONSTRUCTION ; LIPID BIOMARKER ; HOLOCENE VEGETATION ; ORGANIC-MATTER ; CLIMATE-CHANGE ; VARIABILITY ; SEDIMENTS ; LAKE
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368457
作者单位	[Bhattacharya, Sharmila; Kishor, Harsh; Ankit, Yadav] Indian Inst Sci Educ & Res Mohali, Dept Earth & Environm Sci, Mohali, India; [Mishra, Praveen K.; Srivastava, Pradeep] Wadia Inst Himalayan Geol, Dehra Dun, Uttarakhand, India
推荐引用方式 GB/T 7714	Bhattacharya, Sharmila,Kishor, Harsh,Ankit, Yadav,et al. Vegetation History in a Peat Succession Over the Past 8,000 years in the ISM-Controlled Kedarnath Region, Garhwal Himalaya: Reconstruction Using Molecular Fossils[J],2021,9.
APA	Bhattacharya, Sharmila,Kishor, Harsh,Ankit, Yadav,Mishra, Praveen K.,&Srivastava, Pradeep.(2021).Vegetation History in a Peat Succession Over the Past 8,000 years in the ISM-Controlled Kedarnath Region, Garhwal Himalaya: Reconstruction Using Molecular Fossils.FRONTIERS IN EARTH SCIENCE,9.
MLA	Bhattacharya, Sharmila,et al."Vegetation History in a Peat Succession Over the Past 8,000 years in the ISM-Controlled Kedarnath Region, Garhwal Himalaya: Reconstruction Using Molecular Fossils".FRONTIERS IN EARTH SCIENCE 9(2021).