δ13Corg and n-alkane evidence for changing wetland conditions during a stable mid-late Holocene climate in the central Tibetan Plateau

Abstract

δ 13 C org and n-alkane evidence for changing wetland conditions during a stable mid-late Holocene climate in the central Tibetan Plateau, Palaeogeography, Palaeoclimatology, Palaeoecology (2015), doi: 10.1016/j.palaeo.2015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT ABSTRACTThis study has examined bulk and compound specific organic carbon isotopes (δ 13 C org ) and

Leaf wax <i>n</i>-alkane pattern and compound-specific δ<sup>13</sup>C of plants and topsoils from semi-arid Mongolia

“…is dominated by n-C 29 . Those findings are in line with previous regional studies, which report n-C 31 being mainly produced by grasses/herbs and n-C 29 by deciduous trees and shrubs (Cheung et al, 2015;Wang et al, 2018c;Liu et al, 2018;Bliedtner et al, 2018a). Although Artemisia spp.…”

Leaf wax <i>n</i>-alkane patterns and compound-specific <i>δ</i><sup>13</sup>C of plants and topsoils from semi-arid and arid Mongolia

“…Semi-arid and arid Mongolia is a highly continental region characterised by harsh and long winters and hot and short summers (Dashkhuu et al, 2015). Mongolia is located at the interface of three major atmospheric circulation systems controlling the regional climate (Fig.…”

Holocene evolution of the Indian Summer Monsoon inferred from a lacustrine record of Lake Wuxu, south‐east Tibetan Plateau

“…The δ 13 C of Kobresia meadows (mainly Cyperaceae) was measured to c . −13‰ (Cheung et al ., ). In addition, high δ 13 C values in Lake Wuxu sediments appeared synchronously with higher herbaceous pollen components especially species from Cyperaceae, Poaceae and Chenopodiaceae between 6.0 and 4.2 cal ka bp , indicating high supplies of terrestrial organic materials, especially fragments of C 4 land plants (Zhang et al ., ).…”

“…Leaf wax carbon isotope ratios from Lake Qinghai indicated that C 4 plants accounted for 50% of the terrestrial primary productivity on the north-eastern Tibetan Plateau throughout the Lateglacial and early Holocene (Thomas, et al, 2014). The δ 13 C of Kobresia meadows (mainly Cyperaceae) was measured to c. −13‰ (Cheung et al, 2015). In addition, high δ 13 C values in Lake Wuxu sediments appeared synchronously with higher herbaceous pollen components especially species from Cyperaceae, Poaceae and Chenopodiaceae between 6.0 and 4.2 cal ka BP, indicating high supplies of terrestrial organic materials, especially fragments of C 4 land plants (Zhang et al, 2016).…”

“…The molar ratio of C/N has been used to distinguish terrestrial and aquatic origin of organic matter because of the characteristic C/N composition difference between algae and vascular plants (Meyers 1994). The stable carbon isotope ( 13 C) can also be used to trace the source of organic materials, given the different pathways of use of carbon by various organisms (Xu et al, 2006;Cheung et al, 2015). Thus, the biogeochemical proxies of lacustrine sediments could be used to identify regional environment and climate changes, following necessary identification of the source of organic materials.…”