Influence of plant coverage and environmental variables on pollen productivities: evidence from northern China
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RESEARCH ARTICLE
Influence of plant coverage and environmental variables on pollen productivities: evidence from northern China Kaixiu ZHANG1, Wen QIN1, Fang TIAN (✉)1, Xianyong CAO2,3, Yuecong LI4, Jule XIAO5, Wei DING6, Ulrike HERZSCHUH7,8, Qinghai XU (✉)4
1 College of Resource Environment and Tourism, Beijing Key Laboratory of Resource Environment and GIS, Capital Normal University, Beijing 100048, China 2 Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China 3 Alpine Paleoecology and Human Adaptation Group (ALPHA), Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing 100101, China 4 College of Resources and Environment Sciences, Hebei Normal University, Shijiazhuang 050024, China 5 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 6 Institute of Geological Sciences, Palaeontology, Free University of Berlin, Berlin 12249, Germany 7 Alfred Wegener Institute Helmholtz Center for Polarand Marine Research, Research Unit Potsdam, Potsdam 14473, Germany 8 Institute of Earth and Environmental Sciences, University of Potsdam, Potsdam 14476, Germany
© Higher Education Press 2020
Abstract Pollen productivity is a critical parameter in the interpretation of pollen-vegetation relationships, and in the quantitative reconstructions of past vegetation from fossil pollen records. One-year monitoring records were collected for 143 pollen traps in various parts of northern China, together with modern vegetation data. Absolute Pollen Productivity Estimates (APPE) were calculated for 11 taxa using the ratio of pollen influx to plant coverage at each applicable sampling site, in which the plants of the target taxon were present. Relative Pollen Productivity Estimates (RPPE) were calculated for the 11 taxa (taking Poaceae as the reference taxon) at those sites in which each taxon occurred together with Poaceae. Artemisia and Chenopodiaceae were found to have the highest RPPEs and the largest RPPEs ranges, while Pinus and Quercus also had higher RPPEs than Poaceae; Abies, Betula, Larix, Picea and Cyperaceae had relatively low RPPEs. Variations in RPPE between different areas may be explained by variations in climatic conditions, plant coverage and land use practices which might influence plant growing situation. Marked effect that variations in pollen productivity can have on vegetation reconstructions was demonstrated by applying these distinct RPPEs to reconstructions of Holocene vegetation in the Lake Daihai area (northern Received March 6, 2020; accepted September 23, 2020 E-mails: [email protected] (Fang TIAN); [email protected] (Qinghai XU)
China), such as a large range of RPPE produces a large range of plant coverage. Variations in RPPEs within a single taxon, related to vegetation coverage and climatic conditions, therefore need to be considered in future vegetation reconstructions. Keywords pollen
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