Modern pollen distribution along a Himalayan elevation gradient in Central Nepal

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-15 DOI:10.1016/j.revpalbo.2024.105206

Saraswati Neupane , Khum Narayan Paudayal , Lina Song , Sima Humagain , Binija Kaphle , Jharana Nepal , Atta Ullah , Wenlei Li , Xianyong Cao

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Abstract

Modern pollen distribution and its relationship to environmental variables in tropical to alpine vegetation zones are investigated to provide a reference for palaeoenvironmental reconstructions and to improve the understanding of pollen dispersal patterns in Central Nepal. A total of 100 samples (from soil and moss) were collected from along an elevational gradient ranging from 173 to 4615 m above sea level. Results show that the alpine zone is dominated by arboreal pollen (AP) and the sub-alpine zone also shows good representation of coniferous taxa pollen such as Pinus, Abies, Tsuga, and Picea along with Ericaceae. The temperate zone has a good representation of Quercus (Evergreen) and Pinus pollen, whereas the sub-tropical zone is characterized by Alnus pollen and agricultural taxa such as Cerealia (planted Poaceae) and Brassicaceae. In the tropical zone, non-arboreal pollen (NAP), mainly Cerealia dominate, reflecting intensive agricultural practices. Shorea is completely silent in pollen representation. A redundancy analysis indicates that elevation is the primary factor influencing pollen distribution in this region. Overall, the pollen data reflect the vegetation distribution but Pinus is over-represented and Shorea is unrepresented, which should be taken into consideration when interpreting fossil pollen in Central Nepal.

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尼泊尔中部喜马拉雅山海拔梯度上的现代花粉分布

研究了热带到高山植被区的现代花粉分布及其与环境变量的关系，为古环境重建提供参考，并加深对尼泊尔中部花粉传播模式的了解。从海拔 173 米到 4615 米的海拔梯度上共采集了 100 个样本（土壤和苔藓）。结果表明，高山地区主要是树栖花粉（AP），亚高山地区的针叶类群花粉也有很好的代表性，如 Pinus、Abies、Tsuga、Picea 和 Ericaceae。温带有大量柞树（常绿）和松树花粉，而亚热带则以桤木花粉和谷类（种植禾本科植物）和十字花科等农业分类群为特征。在热带地区，非树木花粉（NAP），主要是谷物花粉占主导地位，反映了密集的农业实践。娑罗树的花粉完全没有代表性。冗余分析表明，海拔是影响该地区花粉分布的主要因素。总体而言，花粉数据反映了植被的分布情况，但松树的代表性过高，而娑罗树的代表性不足，在解释尼泊尔中部的花粉化石时应考虑到这一点。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.