青藏高原南部雅鲁藏布江流域现代孢粉-植被关系及新的花粉-气候指标研究

doi:10.7523/j.issn.2095-6134.2017.06.009

中国科学院大学学报 ›› 2017, Vol. 34 ›› Issue (6): 719-733.DOI: 10.7523/j.issn.2095-6134.2017.06.009

青藏高原南部雅鲁藏布江流域现代孢粉-植被关系及新的花粉-气候指标研究

孙爱芝¹, 张德怀², 代然然²

1. 中国科学院大学地球科学学院中国科学院计算地球动力学重点实验室, 北京 100049;
2. 西南大学地理科学学院, 重庆 400715

收稿日期:2016-06-22 修回日期:2017-05-25 发布日期:2017-11-15
通讯作者: 孙爱芝
基金资助:
Supported by the National Natural Science Foundation of China (41172332, 41002058) and Open research fund of Key laboratory of Tibetan Environmental Changes and Land Surface Processes of Chinese Academy of Sciences

Modern pollen-vegetation relationships and two new pollen-climate indices in the Yarlung Zangbo River basin in southern Tibetan Plateau

SUN Aizhi¹, ZHANG Dehuai², DAI Ranran²

1. Key Laboratory of Computational Geodynamics of Chinese Academy of Sciences, College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
2. School of Geographical Sciences, Southwest University, Chongqing 400715, China

Received:2016-06-22 Revised:2017-05-25 Published:2017-11-15
Supported by:
Supported by the National Natural Science Foundation of China (41172332, 41002058) and Open research fund of Key laboratory of Tibetan Environmental Changes and Land Surface Processes of Chinese Academy of Sciences

摘要/Abstract

摘要： 基于对雅鲁藏布江流域东西方向的70个表土孢粉样品，进行孢粉现代过程的分析和研究，获得以下认识。研究区不同植被带下孢粉组合存在明显差异，如松林带以松属花粉为主，冷杉和云杉林带以冷杉属-松属-云杉属组合为主，阔叶林和灌木带以栎属-桦属-松属组合为主，高寒草甸带以莎草科-蒿属-菊科组合为特征，高寒草原带以蒿属-莎草科组合为特点。其中，AP/NAP（乔木与非乔木花粉）比值可很好地指示植被变化。利用花粉含量的PCA分析，重新建立2个花粉-气候指标（P_i，T_i），它们分别与年均降水量和年均温度有较高的相关系数，并通过0.01显著性检验，说明它们能够用来定量重建该地区过去气候的变化。

关键词: 现代孢粉, PCA, 气候梯度, 花粉-气候指标, 雅鲁藏布江流域

Abstract: This study collected 70 pollen surface samples along an east-west transection in the Yarlung Zangbo River (YLZR) basin in the southern Tibetan Plateau. Pollen assemblage and principle components analysis results show that each vegetation zone along the transection is characterized by distinctive modern pollen assemblages as follows:1) pine forest zone:Pinus pollen assemblage; 2) fir and spruce forest zone:Abies-Pinus-Picea pollen assemblage; 3) broadleaved forest/shrubland zone:Quercus-Betula-Pinus pollen assemblage; 4) alpine meadow zone:Cyperaceae-Artemisia-Compositae pollen assemblage; and 5) alpine steppe zone:Artemisia-Cyperaceae-Poaceae pollen assemblage. We use the data to define two new pollen-climate indices, (P_i, T_i), based on the ratio between major pollen taxon groups and subgroups. The indices represent the mean annual precipitation (MAP) and mean annual temperature (MAT) of the study area, and they closely track the regional west-east gradients in precipitation and temperature across the YLZR basin. We suggest that the pollen-vegetation-climate indices may be useful for future palaeoclimatic reconstructions using fossil pollen data.

Key words: modern pollen assemblages, PCA, climate gradient, pollen-climate indices, the Yarlung Zangbo River basin

中图分类号:

P948.15

孙爱芝, 张德怀, 代然然. 青藏高原南部雅鲁藏布江流域现代孢粉-植被关系及新的花粉-气候指标研究[J]. 中国科学院大学学报, 2017, 34(6): 719-733.

SUN Aizhi, ZHANG Dehuai, DAI Ranran. Modern pollen-vegetation relationships and two new pollen-climate indices in the Yarlung Zangbo River basin in southern Tibetan Plateau[J]. , 2017, 34(6): 719-733.

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青藏高原南部雅鲁藏布江流域现代孢粉-植被关系及新的花粉-气候指标研究

Modern pollen-vegetation relationships and two new pollen-climate indices in the Yarlung Zangbo River basin in southern Tibetan Plateau

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