Hydrological evolution and differential response of the eco-environment recorded in Lake Maozangtianchi, eastern Qilian Mountains, over the last 900 years

IF 3 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Progress in Physical Geography-Earth and Environment Pub Date : 2024-05-07 DOI:10.1177/03091333241252401
Shilong Guo, Duo Wu, Tao Wang, Lin Chen, Youmo Li, Tianxiao Wang, Shuai Shao, Aifeng Zhou
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Abstract

The Qilian Mountains (QLM) act as an “ecological security barrier” in western China, impacting the downstream ecosystems and water resource utilization. However, the hydrological evolution of the QLM during the last millennium remains controversial, and their ecological response to climate change is poorly understood. We present a pH record based on the brGDGTs (branched glycerol dialkyl glycerol tetraethers) of a 14C-dated sediment core from Lake Maozangtianchi in the QLM. We combined this record with element contents determined by scanning XRF and grain size to reconstruct the summer monsoon precipitation variability over the last 900 years. We also reconstructed the history of eco-environmental changes from the total n-alkane contents. On centennial scales, local precipitation exhibited peaks during the intervals of 1100‒1300 CE and 1750‒2000 CE, as well as between 1400‒1750 CE. Additionally, abrupt decreases in precipitation occurred during the transition from the Medieval Warm Period (MWP) to the Little Ice Age (LIA) (1300‒1400 CE). This pattern coherent with other hydroclimatic records from the monsoonal margin of northern China, likely resulted from the combined impact of the El Niño‒Southern Oscillation on tropical Pacific sea-surface temperatures and the meridional shift of the Intertropical Convergence Zone. In addition, a coupled relationship between plant biomass in the Lake Maozangtianchi watershed and fluctuations in monsoon precipitation was observed, with higher plant biomass during 1100‒1200 CE, 1750‒1900 CE, and 1950‒2000 CE, and lower biomass during 1200‒1400 CE and 1900‒1950 CE. However, during 1400‒1750 CE, plant biomass exhibited a minor increasing trend, deviating from its usual correlation with monsoon precipitation. Despite precipitation usually being the primary climatic factor influencing plant biomass in the QLM, during the LIA, nutrients transported by dust and decreased evapotranspiration became pivotal in bolstering plant growth. Our research emphasizes the significant moderating effects of exogenic dust on vegetation changes in alpine ecosystems.
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祁连山东麓茅藏天池近 900 年水文演变及生态环境差异响应记录
祁连山是中国西部的 "生态安全屏障",影响着下游生态系统和水资源的利用。然而,近千年来祁连山的水文演变仍存在争议,人们对其对气候变化的生态响应也知之甚少。我们根据青龙湖毛藏天池 14C 年代沉积物岩芯中的支链甘油二烷基甘油四醚(brGDGTs)建立了 pH 值记录。我们将这一记录与扫描 XRF 测定的元素含量和粒度相结合,重建了过去 900 年夏季季风降水的变化。我们还通过正构烷烃总含量重建了生态环境变化的历史。在百年尺度上,当地降水量在公元前 1100-1300 年、公元前 1750-2000 年以及公元前 1400-1750 年期间达到峰值。此外,在中世纪温暖期(MWP)向小冰河时期(LIA)(西元前 1300-1400 年)过渡期间,降水量突然减少。这种模式与华北季风边缘的其他水文气候记录相一致,可能是厄尔尼诺-南方涛动对热带太平洋海面温度和热带辐合带经向移动的综合影响所致。此外,还观察到毛藏天池流域植物生物量与季风降水量波动之间的耦合关系,在西元1100-1200年、1750-1900年和1950-2000年期间植物生物量较高,而在西元1200-1400年和1900-1950年期间生物量较低。然而,在西元 1400-1750 年期间,植物生物量呈现出轻微的增长趋势,偏离了其与季风降水的通常相关性。尽管降水通常是影响青藏高原植物生物量的主要气候因素,但在大裂谷时期,由沙尘输送的养分和蒸散量减少成为促进植物生长的关键因素。我们的研究强调了外源沙尘对高山生态系统植被变化的重要调节作用。
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来源期刊
CiteScore
7.20
自引率
5.10%
发文量
53
审稿时长
>12 weeks
期刊介绍: Progress in Physical Geography is a peer-reviewed, international journal, encompassing an interdisciplinary approach incorporating the latest developments and debates within Physical Geography and interrelated fields across the Earth, Biological and Ecological System Sciences.
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