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。
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.
作者
唐道斌
杨坤美
曾兰华
刘向军
辛存林
徐砚田
TANG Daobin;YANG Kunmei;ZENG Lanhua;LIU Xiangjun;XIN Cunlin;XU Yantian(College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,China;School of Geography and Tourism,Jiaying University,Meizhou 514015,Guangdong,China)
出处
《地理学报》
EI
CSSCI
CSCD
北大核心
2023年第9期2284-2298,共15页
Acta Geographica Sinica
基金
国家自然科学基金项目(41972020,42271010)。
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
aeolian sand activity
climate change
human activities
northeastern Tibetan Plateau
1.5 ka
