Surface pollen assemblages as indicators of human impact in the warm temperate hilly areas of eastern China |
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Authors: | Ding Wei Pang RuiMing Xu QingHai Li YueCong Cao XianYong |
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Institution: | College of Resources and Environmental Sciences and Hebei Key Laboratory of Environmental Change and Ecological Construction, HebeiNormal University, Shijiazhuang 050016, China |
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Abstract: | Investigation of 78 surface pollen samples from warm temperate hilly areas of eastern China shows that pollen assemblages
in areas of different land use are significantly different. Pollen concentrations in wastelands are higher than in plantations;
these, in turn, are higher than in farmlands; implying that pollen concentration decreases with increasing human impact. Arboreal
pollen dominated by Pinus and Quercus is common in all samples. Herbaceous pollen percentages are higher while shrub pollen, fern spores and fern allies are lower
in farmlands than in wastelands. Crop pollen is only detectable in and near farmlands; its percentages and concentrations
decrease in wastelands. Cereal and Cruciferae pollen percentages average 16.7% and 6.7% in farmland respectively, but Cereal
reduces to less than 3% and Cruciferae to less than 0.5% in nearby wastelands. Principle coordinates analysis and clustering
analysis indicate that pollen assemblages from farmlands are distinguishable from those under other vegetation types. Occurrence
of Poaceae, Chenopodiaceae, Artemisia, and Compositae pollen and Selaginella sinensis spores are closely related to human activities, and their types and frequencies indicate intensity of human impact. The spatial
distribution of crops, Chenopodiaceae, and Artemisia reflects changes in both natural environments and human activities. Percentages of cereal and Cruciferae pollen, for example,
increase with decreasing altitude, but decrease with increasing latitude. Understanding pollen assemblages under artificial
and human-disturbed vegetation in hilly areas may aid understanding of human impacts on the plains during the early-middle
Holocene. |
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Keywords: | pollen assemblages hilly areas surface pollen farmland wasteland human impact |
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