Advances in Earth Science ›› 2024, Vol. 39 ›› Issue (11): 1169-1182. doi: 10.11867/j.issn.1001-8166.2024.086
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Yue LI 1( ), Ying WANG 1, Yuecong LI 1 , 2, Ruchun ZHANG 3, Linyuan MA 4, Hanfei YOU 1, Rongrong WANG 1, Yihang CAO 1, Qinghai XU 1 , 2( )
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Yue LI, Ying WANG, Yuecong LI, Ruchun ZHANG, Linyuan MA, Hanfei YOU, Rongrong WANG, Yihang CAO, Qinghai XU. Estimation of Relative Pollen Productivity in Alpine Desert Steppe of Western Tibetan Plateau[J]. Advances in Earth Science, 2024, 39(11): 1169-1182.
Ngari is a unique desert steppe type on the Tibetan Plateau, characterized by its desert steppe ecosystem. This region serves as an ideal representation for studying the quantitative relationships between vegetation and climate. Relative Pollen Productivity (RPP) and Relevant Source Area of Pollen (RSAP) are important parameters for quantitative studies of vegetation and climate based on pollen. Based on modern topsoil pollen and vegetation data from 37 sample sites in the Ngari Desert steppe, different sub-models of the ERV model were utilized, with Chenopodiaceae pollen as the reference species, to estimate the relative pollen production and relevant source area of pollen for five major pollen types: Poaceae, Chenopodiaceae, Artemisia, Asteraceae, Brassicaceae, and Potentilla. The results showed that sub-model 2 provided optimal estimates. The relevant source of pollen in the study area was 1 550 m. The relative pollen productivities of the main pollen types are as follows:Chenopodiaceae (=1.000), Artemisia (1.286±0.058), Asteraceae (0.689±0.043), Brassicaceae (0.763±0.063), Potentilla (0.139±0.008), and Poaceae (0.003±0.006). The results of the leave-one-out method and the REVEALS model validation indicate that the above RPP and RSAP results are reliable and can be applied to regional vegetation reconstruction.