Investigation of factors affecting surface pollen assemblages in the Balikun Basin, central Asia: Implications for palaeoenvironmental reconstructions

Zhao, Yongtao; Miao, Yunfa; Fang, Yiman; Li, Yuan; Yan, Lei; Dong, Weimiao; An, Chengbang

doi:10.1016/j.ecolind.2020.107332

Cited by 20 publications

(8 citation statements)

References 56 publications

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“…Although, Artemisia pollen occupied a large proportion (approximately 30.00%) of the mountain steppe zone in previous studies (Lang et al, 2020;Yao et al, 2021a). Poaceae pollen increases slightly, but markedly less than the corresponding increase in vegetation cover; this could be related to the under-representation of Poaceae (Chen et al, 2021a;Zhao et al, 2021) or anthropogenic disturbances, such as overcultivation and overgrazing (Ma et al, 2008;Wei and Zhao, 2016). The combination of Chenopodiaceae, Picea, Artemisia, and Asteraceae dominating the pollen pattern in the mountain steppe zone is slightly different from the local vegetation distribution.…”

Section: Relationship Between Surface Pollen Assemblages and Modern V...mentioning

confidence: 85%

“…As one of the major proxies for the study of climatic environmental change, pollen plays an irreplaceable role in vegetation and climate reconstruction for the Quaternary Period (2.58 Ma-present) (Zhang et al, 2019(Zhang et al, , 2022Li et al, 2020;Chen et al, 2021a;Zhao et al, 2021). Because different plant species produce pollen that varies substantially in production, dispersal ability, deposition rate, and preservation conditions, indicators such as the percentage and concentration of surface pollen are not necessarily equivalent to the distribution and amount of vegetation at a certain time (Ge et al, 2017;Chen et al, 2021b;Zhang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Modern pollen assemblages and their relationships with vegetation and climate on the northern slopes of the Tianshan Mountains, Xinjiang, China

Zhang

et al. 2023

J. Arid Land

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The reconstruction of paleovegetation and paleoclimate requires an understanding of the relationships between surface pollen assemblages and modern vegetation and climate. Here, we analyzed the characteristics of surface pollen assemblages across different vegetation zones in the Tianshan Mountains. Using surface pollen analysis and vegetation sample surveys at 75 sites on the northern slopes of the Tianshan Mountains, we determined the correlation between the percentage of dominant pollen types and the corresponding vegetation cover. Redundancy analysis was used to investigate the relationships between surface pollen assemblages and environmental factors. Our results show that the Tianshan Mountains contain several distinct ecological regions, which can be divided into five main vegetation zones from low to high altitudes: mountain desert zone (

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Section: Relationship Between Surface Pollen Assemblages and Modern V...mentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Modern pollen assemblages and their relationships with vegetation and climate on the northern slopes of the Tianshan Mountains, Xinjiang, China

Zhang

et al. 2023

J. Arid Land

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“…and Chenopodioideae are widespread in temperate regions of the Northern Hemisphere. They are common in temperate steppes, meadows, and uplands especially in dry areas (Zhao et al, 2021). Thus, increases in their pollen percentages may indicate climate changes in more arid conditions.…”

Section: Proxy Interpretation and Discussionmentioning

confidence: 99%

Climatic and hydrological changes in Gaoyou Lake, eastern China over the last millennium, inferred from pollen and grain size records

Guo

Gao

2022

Earth sci. res. j.

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Numerous lakes formed in the area where the Huai River and the Grand Canal converged during the historical period, and it played a substantial role in the evolution of the regional environment. Gaoyou Lake is a vital detention reservoir in the lower reaches of the Huai River. Variations in hydrology and basin-wide environmental changes were analyzed based on pollen assemblages, grain size data, and lithology from sediment cores collected at Gaoyou Lake. This study focused on variations in the hydrodynamic processes of Gaoyou Lake that were responses to changes in climate, regio- nal hydrological events, and human activity. The high percentages of pollen from terrestrial herbs and results of prin- cipal component analysis suggested that the environment of eastern China was arid from AD 900 to 1300 and that this corresponded to the dry conditions of the Medieval Climate Anomaly. The subsequent period between AD 1300 and 1650 was more humid, as revealed by an increase in aquatic pollen and a decrease in grain size. A rise in xerophytic herb taxa (particularly Artemisia and Chenopodioideae) indicated that the climate became arid again from AD 1650 to 1850, during the Little Ice Age. The modern period (AD 1850 onwards) was characterized by another increase in moisture, as reflected by a decrease in herb pollen and grain sizes. The shifts in the course of the Yellow River in AD 1194 and AD 1855 were recorded by abrupt changes in lithology, sediment characteristics, and the percentages of alien pollen taxa. Intense human impacts were demonstrated by cereal-type pollen and an increase in pollen of other cultivated plants such as Cruciferae and Poaceae. This study provides a foundation for further analysis of the dynamic mechanisms between lake development, climate change, and the effects of significant river changes.

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“…The pollen of Artemisia (A), together with that of Chenopodiaceae (C) in arid and semi-arid areas, in the form of the ratio of C/A pollen abundance, was applied to distinguish grassland and desert vegetation types and assess the degree of drought in the geological past (El-Moslimany, 1990;Sun et al, 1994;Davies and Fall, 2001;Herzschuh et al, 2004;Xu et al, 2007;Zhao et al, 2009Zhao et al, , 2012Zhang et al, 2010;Li et al, 2017;Ma et al, 2017;Koutsodendris et al, 2019;Wang et al, 2020), because both Chenopodiaceae and Artemisia are dominant elements of desert vegetation (Wu, 1980;Vrba, 1980;Tarasov et al, 1998;Herzschuh et al, 2004;Li et al, 2010;Zhao et al, 2021), and the sum of their pollen relative abundances in the surface soil is usually more than 50 % in arid and semi-arid areas (Sun et al, 1994;Lu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Among them, the pollen of Artemisia, with its high productivity, wide spatial and temporal distribution, easy identification, and morphological uniformity under the light microscope (LM), is an essential component and useful bioindicator in pollen-based past vegetation reconstructions and environmental assessments. Some researchers regarded Artemisia as an aridity indicator (El-Moslimany, 1990;Yi et al, 2003a, b;Liu et al, 2006;Cai et al, 2019;Cui et al, 2019;Chen et al, 2020;Wu et al, 2020;Cao et al, 2021), while others suggested that the correlation between the relative abundance of Artemisia pollen and humidity was insignificant (Weng et al, 1993;Sun et al, 1996;Koutsodendris et al, 2019;Lu et al, 2020;Zhao et al, 2021). Consequently, there is an urgent need to evaluate whether different pollen types of Artemisia represent distinct habitats.…”

Section: Introductionmentioning

confidence: 99%

Artemisia pollen dataset for exploring the potential ecological indicators in deep time

Lü

Jiao

Feng

et al. 2022

Earth Syst. Sci. Data

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Abstract. Artemisia, along with Chenopodiaceae, is the dominant component growing in the desert and dry grassland of the Northern Hemisphere. Artemisia pollen with its high productivity, wide distribution, and easy identification is usually regarded as an eco-indicator for assessing aridity and distinguishing grassland from desert vegetation in terms of the pollen relative abundance ratio of Chenopodiaceae/Artemisia (C/A). Nevertheless, divergent opinions on the degree of aridity evaluated by Artemisia pollen have been circulating in the palynological community for a long time. To solve the confusion, we first selected 36 species from nine clades and three outgroups of Artemisia based on the phylogenetic framework, which attempts to cover the maximum range of pollen morphological variation. Then, sampling, experiments, photography, and measurements were taken using standard methods. Here, we present pollen datasets containing 4018 original pollen photographs, 9360 pollen morphological trait measurements, information on 30 858 source plant occurrences, and corresponding environmental factors. Hierarchical cluster analysis on pollen morphological traits was carried out to subdivide Artemisia pollen into three types. When plotting the three pollen types of Artemisia onto the global terrestrial biomes, different pollen types of Artemisia were found to have different habitat ranges. These findings change the traditional concept of Artemisia being restricted to arid and semi-arid environments. The data framework that we designed is open and expandable for new pollen data of Artemisia worldwide. In the future, linking pollen morphology with habitat via these pollen datasets will create additional knowledge that will increase the resolution of the ecological environment in the geological past. The Artemisia pollen datasets are freely available at Zenodo (https://doi.org/10.5281/zenodo.6900308; Lu et al., 2022).

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Investigation of factors affecting surface pollen assemblages in the Balikun Basin, central Asia: Implications for palaeoenvironmental reconstructions

Cited by 20 publications

References 56 publications

Modern pollen assemblages and their relationships with vegetation and climate on the northern slopes of the Tianshan Mountains, Xinjiang, China

Modern pollen assemblages and their relationships with vegetation and climate on the northern slopes of the Tianshan Mountains, Xinjiang, China

Climatic and hydrological changes in Gaoyou Lake, eastern China over the last millennium, inferred from pollen and grain size records

Artemisia pollen dataset for exploring the potential ecological indicators in deep time

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