陕西师范大学张正偲团队研究了雅鲁藏布江流域是否可作为青藏高原沙尘源。该项研究成果发表在2025年6月24日出版的《中国地理科学》杂志上。

风沙沉积物广泛分布在中国青藏高原雅鲁藏布江广阔的河谷内，河谷被高山包围，对流入的泥沙运输起着天然屏障的作用。青藏高原究竟是塔克拉玛干沙漠向下风地区排放二氧化碳的过渡带，还是二氧化碳排放的中心，一直存在争议。研究组在雅鲁藏布江流域野外采集了16份陆面风成沉积物，并对其钕、锶同位素组成进行了室内分析。

通过对雅鲁藏布江流域风沙Nd、Sr同位素组成与周边冰川风沙、中国主要沙漠和黄土高原风沙Nd、Sr同位素组成的比较，研究组发现雅鲁藏布江上游是雅鲁藏布江流域风沙Nd、Sr同位素组成的主要来源。这表明，可能是由于山脉造成的运输障碍，只有部分河谷充当其避难所。因此，该研究结果表明，来自高海拔地区（比如他们研究的地点）的化石很容易远距离运输。因此，以往的研究高估了青藏高原的气候条件。

附：英文原文

Title: Investigating Role of Yarlung Zangbo River Valley as a Dust Source over the Tibetan Plateau, China

Author: Wang, Anqi, Han, Lanying, Dong, Zhibao, Liang, Aimin, Zhang, Zhaohui, Zhang, Zhengcai

Issue&Volume: 2025-06-24

Abstract: Aeolian sediments are widely distributed across the broad valley of the Yarlung Zangbo River on the Tibetan Plateau in China and within its valley, which is enclosed by high mountains that act as natural barriers to incoming dust transport. Whether the Tibetan Plateau is a dust sources or a transitional region for dust emission from the Taklimakan Desert to downwind regions had been disputed. Sixteen land surface aeolian sediments were collected from field in the valley of the Yarlung Zangbo River and Nd and Sr isotopic composition were analyzed in the laboratory. By comparing the Nd and Sr isotopic composition of aeolian sediment in the Yarlung Zangbo River Valley with those from adjacent glacier aeolian sediments, China’s main deserts and Loess Plateau, we found that the river’s upper reaches were the dust source for these areas. This indicates that only part of the river valley serves as a dust source, possibly due to the barrier to transport created by the mountains. Our results therefore suggest that dust from high elevations, such as the sites in our study, is easily transported over long distances. Therefore, previous study overestimated the dust sources on the Tibetan Plateau.

DOI: 10.1007/s11769-025-1532-3

Source: https://link.springer.com/article/10.1007/s11769-025-1532-3