地理学报 ›› 2023, Vol. 78 ›› Issue (9): 2284-2298.doi: 10.11821/dlxb202309011

• 全球变化影响及响应 • 上一篇    下一篇

1.5 ka以来青藏高原东北部风沙活动增强的时空差异

唐道斌1,2(), 杨坤美2, 曾兰华2, 刘向军2, 辛存林1(), 徐砚田2   

  1. 1.西北师范大学地理与环境科学学院,兰州 730070
    2.嘉应学院地理科学与旅游学院,梅州 514015
  • 收稿日期:2023-02-08 修回日期:2023-08-24 出版日期:2023-09-25 发布日期:2023-09-28
  • 通讯作者: 辛存林(1967-), 男, 甘肃秦安人, 教授, 博士生导师, 主要从事自然资源与环境变化研究。E-mail: xincunlin@163.com
  • 作者简介:唐道斌(1997-), 男, 广东湛江人, 硕士生, 主要从事释光测年和第四纪地貌研究。E-mail: 2832884261@qq.com
  • 基金资助:
    国家自然科学基金项目(41972020);国家自然科学基金项目(42271010)

Spatio-temporal differences of enhanced aeolian sand activity in the northeastern Tibetan Plateau over the past 1500 years

TANG Daobin1,2(), YANG Kunmei2, ZENG Lanhua2, LIU Xiangjun2, XIN Cunlin1(), XU Yantian2   

  1. 1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
    2. School of Geography and Tourism, Jiaying University, Meizhou 514015, Guangdong, China
  • Received:2023-02-08 Revised:2023-08-24 Published:2023-09-25 Online:2023-09-28
  • Supported by:
    National Natural Science Foundation of China(41972020);National Natural Science Foundation of China(42271010)

摘要:

1.5 ka以来,青藏高原东北部风沙活动增强是因气候变化还是人类活动所致,抑或二者共同作用,目前还不得而知。本文根据自然环境和人口分布将青藏高原东北部分为两个区域:I区主要包括青海湖盆地、共和盆地和河湟谷地,区内水热条件较好、人口较多;II区主要包括黄河源区和柴达木盆地,区内气候寒冷干燥、人口较少。本文归纳整理这两个区域的风成沙年龄、风沙活动记录、古气候代用指标和人类活动等相关的代用记录,分析青藏高原东北部1.5 ka以来风沙活动增强的时空差异及影响因素。结果表明:1.5 ka以来,青藏高原东北部风沙活动增强存在时空差异,I区的风沙活动在相对暖湿的1.5~1.0 ka期间显著增强,而II区的风沙活动直到1.0 ka以来才开始逐渐增强。I区的风沙活动开始增强的时间比II区早了0.5 ka。综合分析发现,人类活动增强对自然植被的破坏是I区的风沙活动增强比II区提前0.5 ka的原因。1.0 ka以来Ⅱ区的风沙活动增强主要是气候变化所致。本文对1.5 ka以来青藏高原东北部风沙活动增强的时空差异的认识,可为未来全球变暖趋势下该地区的生态环境治理和风沙活动变化预测提供参考。

关键词: 风沙活动, 气候变化, 人类活动, 青藏高原东北部, 1.5 ka

Abstract:

Based on previous studies, aeolian sand activity in northeastern Tibetan Plateau (NETP) had strengthened during the past 1500 years, but the reasons are still unknown, concerning climate change, human activities, or a combination of both. In this study, according to the natural environment and population distribution, the NETP is divided into two regions: Zone I, which mainly includes Qinghai Lake Basin, Gonghe Basin and Hehuang Valley, has better hydrothermal condition and the larger population than Zone II that is comprised of Yellow River source area and Qaidam Basin, with cold and dry climate and sparse population. Then, this paper summarizes the published ages of aeolian sand, aeolian sand activity records, paleoclimate proxy indicators and the related records of human activities in these two zones. Also, we analyze the spatio-temporal differences and influencing factors among the increasingly enhanced aeolian sand activity during the past 1500 years in the NETP. The results show that there are spatio-temporal differences of enhanced aeolian sand activity in the NETP over the past 1500 years. Aeolian sand activity in Zone I significantly strengthened during the relatively warm and humid period of 1.5~1.0 ka ago, while that in Zone II did not enhance until since 1.0 ka. The time when the aeolian sand activity began to strengthen in Zone I was 0.5 ka earlier than in Zone II. Through the comprehensive analysis, the study shows that the destruction of natural vegetation caused by increased human activities is the reason why the enhanced aeolian sand activity in Zone I was 0.5 ka earlier than that in Zone II. The enhanced aeolian sand activity in Zone II were mainly caused by climate change over the past 1.0 ka. This study provides an insight in the spatio-temporal differences of the enhanced aeolian sand activity in the NETP over the past 1500 years, as well as a reference for ecological environment governance and predicting the change of aeolian sand activity under the trend of global warming in the future.

Key words: aeolian sand activity, climate change, human activities, northeastern Tibetan Plateau, 1.5 ka