{"title":"根据古土壤记录推断的北蒙古高原过去~ 14000年的环境变化","authors":"Yury Kononov , Olga Khokhlova , Svetlana Timireva , Ochirbat Batkhishig , Aleksandra Simakova , Svetlana Sycheva , Tseden-Ish Bolormaa , Ganbat Byambaa","doi":"10.1016/j.catena.2025.109151","DOIUrl":null,"url":null,"abstract":"<div><div>Paleoenvironment changes in the northern Mongolia over the past 14,000 years have been reconstructed through a multi-proxy analysis of soil-sediment sequences. The chronology was established using eighteen AMS 14C dates from three sections within the Orkhon River basin. Each section contains complex friable sediments with several heterochronous paleosols separated by units of various genesis, mainly aeolian and fluvial. The paleosols were formed during periods of stable landscapes under optimal bioclimatic conditions. The interbedded sediment (mainly sandy silt units) displays the phases of soil degradation due to frequent droughts and increased aeolian processes. Our results suggest that noticeably climatic and environmental changes occurred at the end of the Late Glacial. The wet climate of the Alleröd interstadial (ca. 14–13.5 ka cal BP) changed to the dry climate of the Younger Dryas event (ca. 13–11.5 ka cal BP). The region was covered with steppe and desert steppe vegetation before ∼11.5 ka cal BP. A generally warm and wet climate prevailed in the region during the early Holocene (ca. 11–9 ka cal BP). At that time, the region’s vegetation was steppe, meadow steppes, and forest steppe. Unstable climate conditions existed in the middle Holocene (ca. 8.5–3.0 ka cal BP), and significantly drier conditions were recorded between 6.0 and 3.5 ka cal BP. The early Holocene humid forest-steppe conditions were replaced by drier steppe conditions in the middle Holocene. After 3.5 ka cal BP the climate became wetter and warmer. The late Holocene was featured by meadow steppe predominance under increased moisture conditions.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"257 ","pages":"Article 109151"},"PeriodicalIF":5.7000,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Environmental changes in the Northern Mongolian Plateau during the past ∼14,000 yr inferred from paleosols record\",\"authors\":\"Yury Kononov , Olga Khokhlova , Svetlana Timireva , Ochirbat Batkhishig , Aleksandra Simakova , Svetlana Sycheva , Tseden-Ish Bolormaa , Ganbat Byambaa\",\"doi\":\"10.1016/j.catena.2025.109151\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Paleoenvironment changes in the northern Mongolia over the past 14,000 years have been reconstructed through a multi-proxy analysis of soil-sediment sequences. The chronology was established using eighteen AMS 14C dates from three sections within the Orkhon River basin. Each section contains complex friable sediments with several heterochronous paleosols separated by units of various genesis, mainly aeolian and fluvial. The paleosols were formed during periods of stable landscapes under optimal bioclimatic conditions. The interbedded sediment (mainly sandy silt units) displays the phases of soil degradation due to frequent droughts and increased aeolian processes. Our results suggest that noticeably climatic and environmental changes occurred at the end of the Late Glacial. The wet climate of the Alleröd interstadial (ca. 14–13.5 ka cal BP) changed to the dry climate of the Younger Dryas event (ca. 13–11.5 ka cal BP). The region was covered with steppe and desert steppe vegetation before ∼11.5 ka cal BP. A generally warm and wet climate prevailed in the region during the early Holocene (ca. 11–9 ka cal BP). At that time, the region’s vegetation was steppe, meadow steppes, and forest steppe. Unstable climate conditions existed in the middle Holocene (ca. 8.5–3.0 ka cal BP), and significantly drier conditions were recorded between 6.0 and 3.5 ka cal BP. The early Holocene humid forest-steppe conditions were replaced by drier steppe conditions in the middle Holocene. After 3.5 ka cal BP the climate became wetter and warmer. 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引用次数: 0
摘要
通过对土壤-沉积物序列的多代理分析,重建了蒙古北部近14000年的古环境变化。使用来自额尔孔河流域三个断面的18个AMS 14C日期确定了年表。每个剖面包含复杂的易碎沉积层,由不同成因的单元(主要是风成土和河流土)分隔出若干非同时古土壤。古土壤形成于最佳生物气候条件下的稳定景观时期。互层沉积物(主要是砂质粉土单元)表现出由于频繁干旱和风成过程增加而导致的土壤退化阶段。研究结果表明,晚冰期末期发生了明显的气候和环境变化。Alleröd间期(约14 ~ 13.5 ka cal BP)的湿润气候转变为新仙女木事件(约13 ~ 11.5 ka cal BP)的干燥气候。在约11.5 ka cal BP之前,该地区被草原和荒漠草原植被覆盖。在全新世早期(约11-9 ka cal BP),该区气候普遍温暖湿润。当时,该地区的植被有草原、草甸草原和森林草原。全新世中期(约8.5 ~ 3.0 ka cal BP)气候条件不稳定,6.0 ~ 3.5 ka cal BP气候条件明显干燥。在全新世中期,湿润的森林草原条件被干燥的草原条件所取代。在3.5 ka cal BP之后,气候变得更加湿润和温暖。晚全新世在湿润条件下以草甸草原为主。
Environmental changes in the Northern Mongolian Plateau during the past ∼14,000 yr inferred from paleosols record
Paleoenvironment changes in the northern Mongolia over the past 14,000 years have been reconstructed through a multi-proxy analysis of soil-sediment sequences. The chronology was established using eighteen AMS 14C dates from three sections within the Orkhon River basin. Each section contains complex friable sediments with several heterochronous paleosols separated by units of various genesis, mainly aeolian and fluvial. The paleosols were formed during periods of stable landscapes under optimal bioclimatic conditions. The interbedded sediment (mainly sandy silt units) displays the phases of soil degradation due to frequent droughts and increased aeolian processes. Our results suggest that noticeably climatic and environmental changes occurred at the end of the Late Glacial. The wet climate of the Alleröd interstadial (ca. 14–13.5 ka cal BP) changed to the dry climate of the Younger Dryas event (ca. 13–11.5 ka cal BP). The region was covered with steppe and desert steppe vegetation before ∼11.5 ka cal BP. A generally warm and wet climate prevailed in the region during the early Holocene (ca. 11–9 ka cal BP). At that time, the region’s vegetation was steppe, meadow steppes, and forest steppe. Unstable climate conditions existed in the middle Holocene (ca. 8.5–3.0 ka cal BP), and significantly drier conditions were recorded between 6.0 and 3.5 ka cal BP. The early Holocene humid forest-steppe conditions were replaced by drier steppe conditions in the middle Holocene. After 3.5 ka cal BP the climate became wetter and warmer. The late Holocene was featured by meadow steppe predominance under increased moisture conditions.
期刊介绍:
Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment.
Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.