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Li, Furong
Publications (9 of 9) Show all publications
Cao, X., Tian, F., Li, F., Gaillard, M.-J., Rudaya, N., Xu, Q. & Herzschuh, U. (2019). Pollen-based quantitative land-cover reconstruction for northern Asia covering the last 40 ka cal BP. Climate of the Past, 15(4), 1503-1536
Open this publication in new window or tab >>Pollen-based quantitative land-cover reconstruction for northern Asia covering the last 40 ka cal BP
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2019 (English)In: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 15, no 4, p. 1503-1536Article in journal (Refereed) Published
Abstract [en]

We collected the available relative pollen productivity estimates (PPEs) for 27 major pollen taxa from Eurasia and applied them to estimate plant abundances during the last 40 ka cal BP (calibrated thousand years before present) using pollen counts from 203 fossil pollen records in northern Asia (north of 40 degrees N). These pollen records were organized into 42 site groups and regional mean plant abundances calculated using the REVEALS (Regional Estimates of Vegetation Abundance from Large Sites) model. Time-series clustering, constrained hierarchical clustering, and detrended canonical correspondence analysis were performed to investigate the regional pattern, time, and strength of vegetation changes, respectively. Reconstructed regional plant functional type (PFT) components for each site group are generally consistent with modern vegetation in that vegetation changes within the regions are characterized by minor changes in the abundance of PFTs rather than by an increase in new PFTs, particularly during the Holocene. We argue that pollen-based REVEALS estimates of plant abundances should be a more reliable reflection of the vegetation as pollen may overestimate the turnover, particularly when a high pollen producer invades areas dominated by low pollen producers. Comparisons with vegetation-independent climate records show that climate change is the primary factor driving land-cover changes at broad spatial and temporal scales. Vegetation changes in certain regions or periods, however, could not be explained by direct climate change, e.g. inland Siberia, where a sharp increase in evergreen conifer tree abundance occurred at ca. 7-8 ka cal BP despite an unchanging climate, potentially reflecting their response to complex climate-permafrost-fire-vegetation interactions and thus a possible long-term lagged climate response.

Place, publisher, year, edition, pages
Copernicus Gesellschaft MBH, 2019
National Category
Climate Research Ecology Physical Geography
Research subject
Environmental Science, Paleoecology
Identifiers
urn:nbn:se:lnu:diva-88792 (URN)10.5194/cp-15-1503-2019 (DOI)000480290300001 ()
Available from: 2019-08-28 Created: 2019-08-28 Last updated: 2019-08-28Bibliographically approved
Li, F., Gaillard, M.-J., Xu, Q., Bunting, M. J., Li, Y., Li, J., . . . Shen, W. (2018). A Review of Relative Pollen Productivity Estimates From Temperate China for Pollen-Based Quantitative Reconstruction of Past Plant Cover. Frontiers in Plant Science, 9, Article ID 1214.
Open this publication in new window or tab >>A Review of Relative Pollen Productivity Estimates From Temperate China for Pollen-Based Quantitative Reconstruction of Past Plant Cover
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2018 (English)In: Frontiers in Plant Science, ISSN 1664-462X, E-ISSN 1664-462X, Vol. 9, article id 1214Article, review/survey (Refereed) Published
Abstract [en]

Model-based quantitative reconstruction of past plant cover in Europe has shown great potential for: (i) testing hypotheses related to Holocene vegetation dynamics, biodiversity, and their relationships with climate and land use; (ii) studying long term interactions between climate and land use. Similar model-based quantitative reconstruction of plant cover in China has been restricted due to the lack of standardized datasets of existing estimates of relative pollen productivity (RPP). This study presents the first synthesis of all RPP values available to date for 39 major plant taxa from temperate China and proposes standardized RPP datasets that can be used for model-based quantitative reconstructions of past plant cover using fossil pollen records for the region. We review 11 RPP studies in temperate China based on modern pollen and related vegetation data around the pollen samples. The study areas include meadow, steppe and desert vegetation, various woodland types, and cultural landscapes. We evaluate the strategies of each study in terms of selection of study areas and distribution of study sites; pollen- and vegetation-data collection in field; vegetation-data collection from satellite images and vegetation maps; and data analysis. We compare all available RPP estimates, select values based on precise rules and calculate mean RPP estimates. We propose two standardized RPP datasets for 31 (Alt1) and 29 (Alt2) plant taxa. The ranking of mean RPPs (Alt-2) relative to Poaceae (= 1) for eight major taxa is: Artemisia (21) > Pinus (18.4) > Betula (12.5) > Castanea (11.5) > Elaeagnaceae (8.8) > Juglans (7.5) > Compositae (4.5) > Amaranthaceae/Chenopodiaceae (4). We conclude that although RPPs are comparable between Europe and China for some genera and families, they can differ very significantly, e.g., Artemisia, Compositae, and Amaranthaceae/Chenopodiaceae. For some taxa, we present the first RPP estimates e.g. Castanea, Elaeagnaceae, and Juglans. The proposed standardized RPP datasets are essential for model-based reconstructions of past plant cover using fossil pollen records from temperate China.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2018
Keywords
Extended R-Value (ERV) model, relevant source area of pollen (RSAP), fall speed of pollen (FSP), vegetation-data collection, modern pollen sampling
National Category
Ecology Earth and Related Environmental Sciences
Research subject
Environmental Science, Paleoecology
Identifiers
urn:nbn:se:lnu:diva-77719 (URN)10.3389/fpls.2018.01214 (DOI)000443717800001 ()2-s2.0-85054542315 (Scopus ID)
Available from: 2018-09-13 Created: 2018-09-13 Last updated: 2019-08-29Bibliographically approved
Li, F., Zhao, Y., Gaillard, M.-J., Li, H., Sun, J. & Xu, Q. (2017). Modern pollen–€“climate relationships in north Xinjiang, northwestern China: Implications for pollen-based reconstruction of Holocene climate. The Holocene, 27(7), 951-966
Open this publication in new window or tab >>Modern pollen–€“climate relationships in north Xinjiang, northwestern China: Implications for pollen-based reconstruction of Holocene climate
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2017 (English)In: The Holocene, ISSN 0959-6836, E-ISSN 1477-0911, Vol. 27, no 7, p. 951-966Article in journal (Refereed) Published
Abstract [en]

Fossil pollen records are widely used to reconstruct past climate. Such reconstructions require that the relationships between pollen assemblages, vegetation, and climate are well understood. These can be studied in present circumstances given we assume that modern vegetation and climate are analogous to past ones. In this study, we analyze pollen–vegetation–climate relationships in the Jungar desert and Altay Mountains, northwestern China, a region for which careful reconstruction of past climate is needed to answer unsolved questions on past climate in an area located at the boundary between two different climate regimes (westerlies and monsoon). We use a dataset of 66 surface pollen samples from forest, meadow, steppe, and desert vegetation and six related climate variables, Tann, TJan, TJul, Pann, PJan, and PJul. Principal components analysis, redundancy analysis, Monte Carlo permutation tests, and variation partitioning are applied to quantify these relationships. We also assess pollen ratios as indices of aridity. We find that (1) Pann is the major climatic factor influencing pollen assemblages, followed by PJul, (2) the two variables are not correlated, and (3) the shared effect of (1) PJan and PJul, (2) PJan and Pann, (3) PJul and Tann, and (4) Tann, TJan, and TJul explains a larger portion of the variation in pollen data than the individual effect of each variable. Therefore, robust pollen–climate transfer functions can be developed for Pann and PJul, and several climate variables treated in combination. Artemisia/Chenopodiaceae is a strong index of aridity and Artemisia/Gramineae might be a useful index of Pann and PJul.

Place, publisher, year, edition, pages
Sage Publications, 2017
National Category
Earth and Related Environmental Sciences
Research subject
Environmental Science, Paleoecology
Identifiers
urn:nbn:se:lnu:diva-59570 (URN)10.1177/0959683616678464 (DOI)000406530800004 ()2-s2.0-85025819709 (Scopus ID)
Available from: 2017-01-03 Created: 2017-01-03 Last updated: 2019-08-29Bibliographically approved
Li, F., Gaillard, M.-J., Sugita, S., Mazier, F., Xu, Q., Zhou, Z., . . . Laffly, D. (2017). Relative pollen productivity estimates for major plant taxa of cultural landscapes in central eastern China. Vegetation History and Archaeobotany, 26(6), 587-605
Open this publication in new window or tab >>Relative pollen productivity estimates for major plant taxa of cultural landscapes in central eastern China
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2017 (English)In: Vegetation History and Archaeobotany, ISSN 0939-6314, E-ISSN 1617-6278, Vol. 26, no 6, p. 587-605Article in journal (Refereed) Published
Abstract [en]

In this study we estimate relative pollen productivity (RPP) for plant taxa characteristic of human-induced vegetation in ancient cultural landscapes of the low mountain ranges of Shandong province in eastern temperate China. RPP estimates are required to achieve pollen-based reconstructions of Holocene plant cover using modelling approaches based on Prentice's and Sugita's theoretical background and models (REVEALS and LOVE). Pollen counts in moss samples and vegetation data from 36 sites were used in the Extended R-Value (ERV) model to estimate the relevant source area of pollen (RSAP) of moss polsters and RPP of major plant taxa. The best results were obtained with the ERV sub-model 3 and Prentice's taxon-specific method (using a Gaussian Plume dispersal model) to distance weight vegetation data. RSAP was estimated to 145 m using the maximum likelihood method. RPP was obtained for 18 taxa of which two taxa had unreliable RPP (Amaranthaceae/Chenopodiaceae and Vitex negundo). RPPs for Castanea, Cupressaceae, Robinia/Sophora, Aster/Anthemis-type, Cannabis/Humulus, Caryophyllaceae, Brassicaceae and Galium-type are the first ones for China. Trees, except Robinia/Sophora (RPP = 0.78 +/- 0.03) have larger RPPs than herbs other than Artemisia (RPP = 24.7 +/- 0.36). The RPPs for Quercus, Pinus and Artemisia are comparable with other RPPs obtained in China, the RPPs for Pinus, Quercus, Ulmus, Cyperaceae and Galium-type with the mean RPPs obtained in Europe, and RPP for Cupressaceae with that for Juniperus in Europe. The values for Aster/Anthemis-type, Caryophyllaceae, Asteraceae SF Cichorioideae and Juglans differ from the few RPPs available in China and/or Europe.

Place, publisher, year, edition, pages
Springer, 2017
National Category
Earth and Related Environmental Sciences
Research subject
Environmental Science, Paleoecology
Identifiers
urn:nbn:se:lnu:diva-59571 (URN)10.1007/s00334-017-0636-9 (DOI)000413944100003 ()2-s2.0-85029574430 (Scopus ID)
Available from: 2017-01-03 Created: 2017-01-03 Last updated: 2019-08-29Bibliographically approved
Li, F. (2016). Pollen productivity estimates and pollen-based reconstructions of Holocene vegetation cover in Norhtern adn temperate China for climate modelling. (Doctoral dissertation). Växjö: Linnaeus University Press
Open this publication in new window or tab >>Pollen productivity estimates and pollen-based reconstructions of Holocene vegetation cover in Norhtern adn temperate China for climate modelling
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Model projections of future climate change require that coupled climate-vegetation models are developed and validated, i.e. these models should be able to reproduce past climate and vegetation change. Records of pollen deposited in lake bottoms and peat bogs can provide the information needed to validate these models. The aim of this thesis was i) to explore the modern relationships between pollen and vegetation in northern and temperate China and estimate pollen productivity of major plant taxa, and ii) to use the results of i) to produce the first reconstruction of plant cover in China over the last 10 000 years for the purpose of climate modelling. A study of the modern pollen-vegetation-climate relationships was performed in northwestern China (Paper I). Pollen productivity for 18 major plants of cultural landscapes in central-eastern China was estimated (Paper II). Based on a synthesis and evaluation of all existing estimates of pollen productivity in the study region, a standard dataset of pollen productivity for 31 plant taxa is proposed (Paper III). This dataset was used to achieve pollen-based REVEALS reconstructions of plant cover over the last 10 000 years in 35 regions of northern and temperate China (Paper IV). The major findings can be summarized as follows. Paper I: Annual precipitation (Pann) is the major climatic factor influencing pollen assemblages, followed by July precipitation (PJul). The shared effect of combinations of two climatic factors explains a larger portion of the variation in pollen data than individual variables. Paper II: Of the 16 reliable pollen productivities estimated, the estimates for 8 taxa are new, Castanea, Cupressaceae, Robinia/Sophora, Anthemis type/Aster type, Cannabis/Humulus, Caryophyllaceae, Cruciferae, and Galium type. Trees have in general larger pollen productivity than herbs. Paper III: Of the total 31 taxa for which estimates of pollen productivity are available in China, 13 taxa have more than 1 value. All or most of these values are similar for Artemisia, Cyperaceae, Larix, Quercus and Pinus. Eight taxa have very variable estimates. Paper IV: The REVEALS plant percentage-cover strongly differs from the pollen percentages, and they provide new important insights on past changes in plant composition and vegetation dynamics.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2016. p. 67
Series
Linnaeus University Dissertations ; 271
Keywords
climate, pollen-vegetation relationships, relative pollen productivity, REVEALS model, anthropogenic land-cover change, Holocene, China
National Category
Earth and Related Environmental Sciences
Research subject
Environmental Science, Paleoecology
Identifiers
urn:nbn:se:lnu:diva-59574 (URN)978-91-88357-52-6 (ISBN)
Public defence
2016-12-12, Fullriggaren, Kocken, Kalmar, 09:30
Opponent
Supervisors
Available from: 2017-01-03 Created: 2017-01-03 Last updated: 2019-09-16Bibliographically approved
Xu, Q., Zhang, S., Gaillard, M.-J., Li, M., Cao, X., Tian, F. & Li, F. (2016). Studies of modern pollen assemblages for pollen dispersal- deposition- preservation process understanding and for pollen-based reconstructions of past vegetation, climate, and human impact: A review based on case studies in China. Quaternary Science Reviews, 149, 151-166
Open this publication in new window or tab >>Studies of modern pollen assemblages for pollen dispersal- deposition- preservation process understanding and for pollen-based reconstructions of past vegetation, climate, and human impact: A review based on case studies in China
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2016 (English)In: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 149, p. 151-166Article in journal (Refereed) Published
Abstract [en]

Fossil pollen, as a direct proxy record of past vegetation, and indirect proxy record of past climate, plays an essential role in revealing and reconstructing past vegetation and climate. However, relationships between pollen, vegetation and climate are not linear, hence quantitative reconstructions of past vegetation and climate based on pollen records are not straightforward, and results may be highly contradictory and difficult to interpret. One of the main causes of discrepancies between results has been the lack of comprehensive and systematical studies on modern pollen dispersal and deposition processes, particularly on the quantification of these processes. Based on empirical studies performed in China over the last 30 years, this paper provides the state-of-the-art of the understanding of pollen dispersal and deposition processes in China and the remaining questions to be investigated. We show that major progress has been achieved in the study of modern pollen dispersal and deposition processes, and in the application of models of the pollen-vegetation-climate relationships for quantitative reconstruction of past vegetation and climate. However, several issues are not entirely solved or understood yet, such as how to quantify the reworking and re-deposition of pollen grains in quaternary alluvial sediments, the influence of pollen preservation on pollen assemblages, and human impact on vegetation. Even so, the progress made during the last decades makes it possible to achieve significantly more precise and informative reconstructions of past vegetation, land-use and climate in China than was possible earlier.

Keywords
Deposition and preservation, Modern pollen assemblages, Pollen dispersal, Pollen productivity, Quantitative pollen-based reconstruction of past vegetation, climate and land use
National Category
Climate Research Geology
Research subject
Environmental Science, Paleoecology
Identifiers
urn:nbn:se:lnu:diva-56061 (URN)10.1016/j.quascirev.2016.07.017 (DOI)000383825400010 ()2-s2.0-84979896395 (Scopus ID)
Note

Funding Details: 41371215, NSFC, National Natural Science Foundation of China

Available from: 2016-09-16 Created: 2016-08-31 Last updated: 2017-11-21Bibliographically approved
Zhao, Y., Tang, Y., Yu, Z., Li, H., Yang, B., Zhao, W., . . . Li, Q. (2014). Holocene peatland initiation, lateral expansion, and carbon dynamics in the Zoige Basin of the eastern Tibetan Plateau. The Holocene, 24(9), 1137-1145
Open this publication in new window or tab >>Holocene peatland initiation, lateral expansion, and carbon dynamics in the Zoige Basin of the eastern Tibetan Plateau
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2014 (English)In: The Holocene, ISSN 0959-6836, E-ISSN 1477-0911, Vol. 24, no 9, p. 1137-1145Article in journal (Refereed) Published
Abstract [en]

The Zoige Basin on the eastern Tibetan Plateau has the largest area of highland peatlands in China. However, the development history of these peatlands is still poorly understood. Understanding how these carbon-rich ecosystems responded to change in the Asian summer monsoons during the Holocene will provide insight into the peatland carbon accumulation processes under different climate boundary conditions. Here, we document the timing of initiation and expansion histories of these peatlands using 59 new basal peat ages across the Zoige Basin, with 29 ages for initiation analysis and 30 additional ages for lateral expansion analysis. Also, we synthesized basal ages from 26 sites and carbon accumulation records at four sites from previous studies in this region. The results show that the peatland initiation is widespread at 11.5-10 and 7-6 kyr (1 kyr = 1000 cal. yr BP) and the minimum initiation periods occurred after 5 kyr. Our multiple basal ages along eight transects show that slopes are a dominant control on peatland lateral expansion rates, with very slow and less variable rates at slopes >0.4 degrees. Furthermore, we found a significant relationship between peatland basal ages and peat depths from 85 sites, suggesting relatively uniform peat properties. Carbon accumulation rates from detailed downcore analysis at four sites and on the basis of peat depth-basal age relationship show similar patterns with a peak carbon accumulation at 10-8 kyr. On the basis of estimated mean values of bulk density and carbon content from the region, the Holocene average C accumulation for the Zoige Basin is 31.1 g C/m(2)/yr. The widespread peatland initiation and rapid accumulation in the early Holocene were likely in response to higher temperature and stronger summer monsoon intensity, while the slowdown of peatland development during the late Holocene might have been caused by climate cooling and drying.

Keywords
Asian summer monsoon, basal peat ages, carbon accumulation, peatland expansion, peatland initiation, Tibetan Plateau
National Category
Ecology Geology
Research subject
Environmental Science, Paleoecology
Identifiers
urn:nbn:se:lnu:diva-37939 (URN)10.1177/0959683614538077 (DOI)000342578200011 ()2-s2.0-84907148107 (Scopus ID)
Available from: 2014-10-30 Created: 2014-10-30 Last updated: 2019-03-29Bibliographically approved
Li, F., Gaillard, M.-J., Xu, Q. H., Li, Y. C., Li, J., Mu, H. C., . . . Shen, W. A review of pollen productivity estimates for major plant taxa of northern and temperate China and implications for long-term quantitative reconstruction of past plant cover.
Open this publication in new window or tab >>A review of pollen productivity estimates for major plant taxa of northern and temperate China and implications for long-term quantitative reconstruction of past plant cover
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(English)Manuscript (preprint) (Other academic)
National Category
Earth and Related Environmental Sciences
Research subject
Environmental Science, Paleoecology
Identifiers
urn:nbn:se:lnu:diva-59572 (URN)
Available from: 2017-01-03 Created: 2017-01-03 Last updated: 2018-12-07Bibliographically approved
Li, F., Gaillard, M.-J., Herzschuh, U., Cao, X. Y., Sugita, S., Ni, J., . . . Xu, Q. H.Pollen-based quantitative reconstructions of Holocene plant abundance in northern and temperate china using the REVEALS model.
Open this publication in new window or tab >>Pollen-based quantitative reconstructions of Holocene plant abundance in northern and temperate china using the REVEALS model
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(English)Manuscript (preprint) (Other academic)
National Category
Earth and Related Environmental Sciences
Research subject
Environmental Science, Paleoecology
Identifiers
urn:nbn:se:lnu:diva-59573 (URN)
Available from: 2017-01-03 Created: 2017-01-03 Last updated: 2017-01-03Bibliographically approved
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