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pollen indication to source plants in the eastern desert of China

Science Bulletin 2005年第15期 98-107页

作者： LI Yuecong1,2, XU Qinghai2, ZHAO Yingkui3, YANG Xiaolan4, XIAO Jule1, CHEN Hui2,5 & Lü Xinmiao5 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2. College of Resources and Environment, Hebei Normal University, Shijiazhuang 050016, China 3. Department of Environmental Management, University of Central Lancashire, Preston, UN 4. Hebei Geography Institute, Hebei Academy of Sciences, Shijiazhuang 050011, China 5. Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

In order to investigate the indication of major pollen types to source plants, 39 surface pollen samples are collected from 39 plant communities. The results show that diversity of pollen assemblages presents in different commu-nities. Chenopodiaceae pollen percentages are highest in Kalidium communities and Ceratoides communities (higher than 45%, average is 63.4%), but high Ephedra pollen per-centages (higher than 3.3%, average is 16.5%)in Ceratoides communities make it distinguished from Kalidium communi-ties. Artemisia pollen percentages (more than 50%) are much higher than Chenopodiaceae (less than 35%) in Artemisia Communities. Nitraria pollen percentages (higher than 2%, average is 13.6%) are highest in Nitraria communities com-pared with those in other community patterns. Tamariceae pollen percentages (higher than 2%, average is 8.6%) are highest both in Tetraena and Reaumuria communities com-pared with those in other community patterns. But in Reau-muria communities, Artemisia pollen percentages are higher than Chenopodiaceae with some other pollen types such as Gramineae, Compositae, Leguminosae; on the contrary, in Tetraena communities, Artemisia pollen percentages are less than Chenopodiaceae with few other pollen types. Calli-gonum pollen only appears in Calligonum communities (higher than 2%,average is 5%). The results of cluster analysis (CLA) and detrended correspondence analysis (DCA) show that the pollen indication to source plants can be reflected by association indices (A), over-representation in-dices (O), under-representation indices (U), R-value, the av-erage pollen percentages where parent plants are absent (Xa) and the average pollen percentages where parent plants are present (Xp). Zygophyllum, Calligonum, Tetraena, Tribulus and Tamariceae can indicate source plants very well, owing to high A scores. Artemisia, Chenopodiaceae and Gramineae have high R-values, and Nitraria, Cruciferae and sedum have high O scores, so they are over-represente

关键词： eastern desert of China pollen indication association indices (A) over-representation indices (O) under-representation indices (U) correlation coefficients (CC) similarity coefficients (C) detrended correspondence analysis (DCA) cluster analysis (CLA) ratios of Nitraria and Ephedra (N/E) ratios of Ephedra and Artemisia (E/A) ratios of Artemisia and Chenopodiaceae (A/C).

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