Nannan Wang , Wenjia Li , Yanrong Zhang , Lina Liu , Xianyong Cao
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引用次数: 0
Abstract
The northeastern Tibetan Plateau is the region with the longest history of development, most densely populated, and most obvious land use of the Tibetan Plateau. However, there is a lack of accurate knowledge of the timing and intensity of the human impacts on vegetation during the mid-to-late Holocene. In this study, we quantitatively compare the pollen assemblages from farmland with surrounding natural vegetation and results show that agricultural activities lead to an increase of Brassicaceae, cerealia Poaceae, and Hippophae pollen. Vegetation and climate change since 5 cal ka BP for Guli Lake in Hehuang Valley have been reconstructed from pollen and sediment chemistry data; and anthropogenic pollen indicators identified from a sediment core are combined with evidence from archaeological sites and historical documents, revealing that agricultural activity began after 4.8 cal ka BP but initially had a limited impact on vegetation. By 0.5 cal ka BP, the impact of farming activity on the vegetation increased significantly and oil-seed crops were cultivated, but the vegetation was still strongly affected by climate. Due to its superior natural condition, favourable government policy, and advanced agricultural technology, the Hehuang Valley became a pioneer area for agricultural expansion into the high-elevation region of the Tibetan Plateau.
期刊介绍:
Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.