A 16000-year pollen record of Qinghai Lake and its paleocli-mate and paleoenvironment

Liu, Xingqi; Shen, Ji; Wang, Sumin; Yang, Xiangdong; Tong, Guoxiang; Zhang, Enlou

doi:10.1360/02tb9421

Cited by 118 publications

(103 citation statements)

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“…Our analysis of pollen from Lake Kusai has revealed that the northern part of the Tibetan Plateau was characterised by high values of Artemisia and Chenopodiaceae during the late-Holocene, which is generally consistent with results obtained by other investigators from nearby sites such as Lake Qinghai (Liu et al, 2002;Shen et al, 2005), Lake Hurleg (Zhao et al, 2007), Lake Kuhai (Wischnewski et al, 2011), and Lake Donggi Cona (Wang et al, submitted for publication). For pollen records from arid and semi-arid areas, the A/C ratio has been shown to be a reliable indicator for changes in moisture levels owing to the different ecological tolerances of Artemisia and Chenopodiaceae (Campo et al, 1996;Cour et al, 1999;Herzschuh et al, 2003Herzschuh et al, , 2004Herzschuh, 2007).…”

Section: Environmental Indicator Value Of Individual Sedimentary Proxiessupporting

confidence: 90%

“…4c). Rather stable environmental conditions have been reported from nearby lakes on the basis of their pollen assemblages (Liu et al, 2002;Shen et al, 2005;Zhao et al, 2007;Wischnewski et al, 2011;, submitted for publication) and geochemical proxies (Ji et al, 2005;Mischke et al, 2009;Henderson et al, 2010).…”

Section: From 2400 To 900 Cal a Bp: Gradual Decrease In Vegetation Comentioning

confidence: 99%

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Temporally changing drivers for late-Holocene vegetation changes on the northern Tibetan Plateau

Wang

Liu

Herzschuh

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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a b s t r a c t a r t i c l e i n f oFossil pollen records have been widely used as indicators of past changes in vegetation and variations in climate. The driving mechanisms behind these vegetation changes have, however, remained unclear. In order to evaluate vegetation changes that have occurred in the northern part of the Tibetan Plateau and the possible drivers behind these changes, we have applied a moving-window Redundancy Analysis (RDA) to high resolution (10-15 years) pollen and sedimentary data from Lake Kusai covering the last 3770 years. Our analyses reveal frequent fluctuations in the relative abundances of alpine steppe and alpine desert components. The sedimentary proxies (including total organic carbon content, total inorganic carbon content, and "end-member" indices from grain-size analyses) that explain statistically some of the changes in the pollen assemblage vary significantly with time, most probably reflecting multiple underlying driving processes. Climate appears to have had an important influence on vegetation changes when conditions were relatively wet and stable. However, a gradual decrease in vegetation cover was identified after 1500 cal a BP, after which the vegetation appears to have been affected more by extreme events such as dust-storms or fluvial erosion than by general climatic trends. Furthermore, pollen spectra over the last 600 years are shown by Procrustes analysis to be statistically different from those recovered from older samples, which we attribute to increased human impact that resulted in unprecedented changes to the vegetation composition. Overall, changes in vegetation and climate on the northern part of the Tibetan Plateau appear to have roughly followed the evolution of the Asian Summer Monsoon. After taking into account the highly significant millennial (1512 years) periodicity revealed by time-series analysis, the regional vegetation and climate changes also show variations that appear to match variations in the mid-latitude westerlies.

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Section: Environmental Indicator Value Of Individual Sedimentary Proxiessupporting

confidence: 90%

Section: From 2400 To 900 Cal a Bp: Gradual Decrease In Vegetation Comentioning

confidence: 99%

Temporally changing drivers for late-Holocene vegetation changes on the northern Tibetan Plateau

Wang

Liu

Herzschuh

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…As Qinghai Lake is located in the area where the three climatic systems intersect, lots of studies on its sensitivity to the climate have been made by many domestic and international scientists [2][3][4][5][6][7][8] . With respect to the relationship between climatic and monsoon changes, many previous studies generally indicated that the climate in Qinghai Lake area is mainly controlled by southeast monsoon [7,9,10] .…”

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confidence: 99%

Southwest monsoon changes indicated by oxygen isotope of ostracode shells from sediments in Qinghai Lake since the late Glacial

et al. 2007

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The δ 18 O records of ostracode shells in sediments of core QH-2000 from Qinghai Lake can be used as a better proxy to reflect monsoon changes. Low monsoon precipitation between 17.5 and 11 cal. ka BP is indicated by positive δ 18 O values averaging 2.37‰. A fast shift in δ 18 O from positive at 11 cal. ka BP to negative at 10 cal. ka BP indicates sharp increase of monsoon precipitation. An interval of generally high monsoon precipitation is observed between 10 and 6 cal. ka BP with δ 18 O values averaging −2.15‰. Decrease of monsoon precipitation between 6 and 2.5 cal. ka BP is indicated by positive δ 18 O values. δ 18 O keeps positive values averaging 3.0‰ between 2.5 and 0 cal. ka BP suggesting low high monsoon precipitation. The climatic changes indicated by δ 18 O records of ostracode shells in sedi-ments of core QH-2000 from Qinghai Lake and our broader regional comparison show that the climate in Qinghai Lake since the late Glacial is probably controlled by southwest monsoon other than southeast monsoon.

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“…This dry spell delineated the end of the abovementioned Holocene megathermal maximum. Related to this drought event is a significant increase in the abundance of Artemisia and the concomitant decrease in the abundance of other tree pollen preserved in the sediments of Qinghai Lake (Liu et al 2002); a reducing of total organic carbon content in the Zoige region (Zhou et al 2002); a sudden increase of Chenopodiaceae and lower A/C ratio in the sediments of the Bangong Co basin (Fig. 4) and an increase in the abundance of conifers, grasses, and Artemisia pollen in the Sujiawan section (Feng et al 2004) during this period have also been shown to be related to the drought event.…”

Section: Qinghai-tibetan Plateau Alpine Scrub and Meadow Ecoregionmentioning

confidence: 99%

“…The global cold event centered around 8200 yr (8400-8000 cal. yr BP), was recorded in the Guliya (Wang et al 2002) and Greenland (Barber et al 1999) ice cores and the standardized ocean stacked ice rafted debris (IRD) record , and some terminal moraines are known to have formed around 8000 yr along the perimeters of the existing Guliya and Dunde ice caps in the northern Tibetan Plateau (Li and Jiao 1990;Jiao et al 2000). Periglacial involutions were also well developed in the Gonghe Basin in the northeast Tibetan Plateau around 8350 yr (Zhou et al 1991).…”

Section: Qinghai-tibetan Plateau Alpine Scrub and Meadow Ecoregionmentioning

confidence: 99%

Holocene climate events inferred from modern and fossil pollen records in Butuo Lake, Eastern Qinghai–Tibetan Plateau

et al. 2015

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Expansion of the spatial coverage of pollen data is essential to improve understanding of Holocene climate variation. To address this, we collected 25 surface and 72 fossil samples from Butuo Lake in the eastern Qinghai-Tibetan Plateau, China. We reconstructed the vegetation history of the region through detrended correspondence analysis (DCA) of the pollen data. Based on the results of this analysis, we divided the samples into five pollen zones (alpine sparse cushion vegetation, alpine scrub, alpine meadow, montane scrub meadow, and montane coniferous forest) corresponding to the major vegetation types. The observed temporal changes in vegetation (as indicated by the DCA of surface and fossil pollen spectra results, ratios of Artemisia to Cyperaceae (A/Cy), the sum of percentages of dryness indicators (SDI), and percentages of main pollen types) and modern pollen-climate transfer function (developed using the weighted averaging partial least squares regression method (WAPLS)) yield a sensitive record of Holocene monsoonal climate change in the area. During 11,140-8700, 8000-6000, and 5600-1780 cal. yr BP, the climate was wet and the vegetation was dominated by alpine meadow, indicating the occurrence of a strong southwest Asian monsoon that spanned almost the entire Holocene. Notably, two major cold and drought episodes are detected at 8700-8000 and 6000-5600 cal. yr BP, with vegetation dominated by alpine steppe, suggesting that the southwest Asian monsoon was extremely weak during these periods. The data will improve understanding of long-term variations of the southwest Asian monsoon in the region.Climatic Change

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A 16000-year pollen record of Qinghai Lake and its paleocli-mate and paleoenvironment

Cited by 118 publications

References 10 publications

Temporally changing drivers for late-Holocene vegetation changes on the northern Tibetan Plateau

Temporally changing drivers for late-Holocene vegetation changes on the northern Tibetan Plateau

Southwest monsoon changes indicated by oxygen isotope of ostracode shells from sediments in Qinghai Lake since the late Glacial

Holocene climate events inferred from modern and fossil pollen records in Butuo Lake, Eastern Qinghai–Tibetan Plateau

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