Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

{"title":"Extreme flood events in the Yi and Shu river basins of the Haidai region (Shandong Province, China) during the late Holocene: Implications for future risk prediction","authors":"Tianyu Shi ,&nbsp;Xiaodong Miao ,&nbsp;Hongyuan Shen ,&nbsp;Qiumin Zhai ,&nbsp;Songna Wang","doi":"10.1016/j.palaeo.2025.113011","DOIUrl":"10.1016/j.palaeo.2025.113011","url":null,"abstract":"<div><div>Modern floods in the Yi and Shu river basins (YSRs), the largest mountain torrent channels in the Haidai region, Shandong Province, China, are often triggered by monsoonal rainfall, shaping the fluvial landscape through frequent inundations. However, our understanding of flood events remains limited due to short observational records and their limited spatial distribution. The lack of long and complete palaeoflood records limit our understanding of extreme flood events, hindering risk prediction and prevention efforts. In this study, we examine the sediment characteristics of two palaeoflood profiles in the YSRs and, based on twelve optically stimulated luminescence (OSL) ages, four ¹⁴C ages, and grain size-sensitive components, identified three exceptional palaeoflood periods: 4.1–3.9 ka, 3.4–2.9 ka, and 0.88–0.7 ka, along with a less severe flood period during 0.7–0.1 ka. An analysis of pollen records, stalagmite data, historical flood records, and El Niño-Southern Oscillation (ENSO) activity reveals a strong correlation between palaeofloods in the YSRs basin and other major rivers (Yellow River, Huai River, Han River, and Yangtze River) with a significant negative correlation to the intensity of the East Asian Summer Monsoon and a positive correlation to the ENSO intensity. These palaeoflood events are typically closely linked to global climate shifts during the late Holocene, including the 4.2 ka event, the 2.8 ka event, and the Little Ice Age. Simultaneous occurrences of climatic deterioration (arid and cold) and palaeofloods during 4.1–3.9 ka and 3.4–2.9 ka may have contributed to cultural disruptions during the Late Longshan Culture period and the decline of the Shang culture in the Haidai area. We argue that these hydroclimatic events are regional expressions of global climate phenomena, and the identified palaeofloods offer key insights into how East Asian rivers respond to global climate change.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"674 ","pages":"Article 113011"},"PeriodicalIF":2.6,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Examining potential drivers of variation in the carbonate-collagen stable carbon isotope offset of modern and Late Pleistocene ungulates from C3-dominant ecosystems","authors":"Laura C. Eastham ,&nbsp;Robert S. Feranec","doi":"10.1016/j.palaeo.2025.113014","DOIUrl":"10.1016/j.palaeo.2025.113014","url":null,"abstract":"<div><div>The stable carbon isotope composition (δ¹³C) of mammalian hard tissues offers a powerful tool for understanding the ecology of modern and fossil species. Over the past 40 years, the offset between δ¹³C values measured in structural carbonate and collagen (Δ_ca-co) has been used as an indicator of trophic category. However, several recent studies have demonstrated substantial variation in the Δ_ca-co values of herbivores, raising calls for caution in the use of static Δ_ca-co values to interpret trophic relationships. To better clarify mechanisms driving variation in herbivore Δ_ca-co, we examined the relationship between δ¹³C_carbonate and δ¹³C_collagen in modern and Late Pleistocene ungulates from C₃-dominant ecosystems in the Americas and Eurasia. Factors investigated included diet, digestive physiology, and tissue type. Our results showed considerable variation in herbivore Δ_ca-co, underscoring the need for caution when applying static values to reconstruct trophic position. We found a consistent diet-driven pattern in Δ_ca-co values (grazer &gt; mixed feeder &gt; browser). Identifying this pattern in modern and ancient species adds to growing evidence for the generalizability of the relationship between herbivore diet and Δ_ca-co. In contrast, the fossil data set showed evidence counter to predictions based on physiology: non-ruminants displayed higher Δ_ca-co values and a greater rate of increase in δ¹³C_carbonate relative to δ¹³C_collagen than ruminants. Finally, tissue type substantially influenced Δ_ca-co, with values derived from teeth generally higher and more variable than from bone. This work highlights the potential for herbivore Δ_ca-co to serve as a refined indicator of dietary ecology in modern and ancient ecosystems.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"674 ","pages":"Article 113014"},"PeriodicalIF":2.6,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Holocene vegetation and environmental changes of peat ecosystems in southwestern and northeastern Amazonia","authors":"B. Wang ,&nbsp;H. Behling","doi":"10.1016/j.palaeo.2025.113010","DOIUrl":"10.1016/j.palaeo.2025.113010","url":null,"abstract":"<div><div>Amazonia plays a significant role in the global climate change, hydrological cycle, biodiversity conservation, especially in the carbon (C) cycle. Amazonia likely contains the most extensive peat C stock in the tropics. Easily degraded, these Amazonian peat ecosystems are at risk of changing from representing a large C sink to a major C source, impacting global cycles. Thus, it is essential to understand how the peat ecosystems in Amazonia developed and the past drivers of changes. Most palaeoecological research on these peat ecosystems has focused on the northwestern Amazonia. Although the representative peat ecosystems in southwestern (SW) and northeastern (NE) Amazonia have been investigated for vegetation dynamics, peat and organic C accumulation, climate, human activities, hydrology, and geomorphology, our knowledge of peat ecosystem evolution is still insufficient. Therefore, in this paper, we first summarize the recently published palaeoecological studies for representative peat ecosystems in SW and NE Amazonia, and the modern and Holocene regional climate. We reconsider the mechanisms of the representative peat ecosystems combined with other related palaeoecological studies under the regional climate framework. Finally, we compare the conditions of peat ecosystems in SW and NE Amazonia. Through the present comparison, we find that the development of peat ecosystems depends on local settings in Amazonia. The onset of the peat ecosystem is mainly driven by river dynamics in SW Amazonia, but is strongly influenced by the Atlantic sea level in low-lying areas in NE Amazonia. The local factors also include geomorphology, fluvial dynamics, local climate, and human activities. Various influencing factors cause diverse processes in peat ecosystems, whether in vegetation successions or peat and C accumulation rates. It is worth noting that regional human activities may indirectly play an important role in peat ecosystem development in both SW and NE Amazonia. This study helps to further understand the mechanism of the development of tropical peat ecosystems, which is important for the modeling, conservation, and management of tropical peat ecosystems.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"673 ","pages":"Article 113010"},"PeriodicalIF":2.6,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detrital zircon UPb geochronology of the Cenozoic succession in the southern Tarim Basin: Implications for the northward expansion of the West Kunlun Orogen and the evolution of intracontinental convergence in the northwestern Tibetan Plateau","authors":"Chunyang Li ,&nbsp;Kaixuan An ,&nbsp;Xiubin Lin ,&nbsp;Yong Li ,&nbsp;Xianzhang Yang ,&nbsp;Liang Zhang ,&nbsp;Cai Chen ,&nbsp;Shujun Liang ,&nbsp;Xiaochun Wei ,&nbsp;Yang Qu ,&nbsp;Xinyue Zhao ,&nbsp;Jialun Huang ,&nbsp;Hanlin Chen ,&nbsp;Shubing Li","doi":"10.1016/j.palaeo.2025.113006","DOIUrl":"10.1016/j.palaeo.2025.113006","url":null,"abstract":"<div><div>The collision between the Indian and Eurasian plates led to the formation of the Tibetan Plateau and the development of a broad zone of intracontinental deformation. Situated in the northwestern Tibetan Plateau, the West Kunlun Orogen is a key region for examining intracontinental responses to the far-field effects of the India–Eurasia collision. However, the nature of convergence between the Tarim Basin and the West Kunlun Orogen remains uncertain. The West Kunlun Orogen consists of the northern and southern West Kunlun terranes and the Songpan-Ganzi terrane, each exhibiting distinct zircon U<img>Pb geochronological signatures. In this study, we apply detrital zircon U<img>Pb geochronology and related analyses to nine Cenozoic sediment samples from the Keliyang section and one sample from the Sangju River to investigate source-to-sink relationships and the uplift history of the West Kunlun Orogen. Our results reveal a significant shift in sedimentary provenance, transitioning from sources in the Songpan-Ganzi and southern West Kunlun terranes during the deposition of the Bashibulake, Keziluoyi, Anjuan and Pakabulake formations to the northern West Kunlun terrane during the deposition of the Artux Formation. This shift indicates a northward expansion of the West Kunlun Orogen, accompanied by a migration of the deformation front from the Tam Karaul Fault to the Tiklik Fault. These findings support a transition in convergence dynamics between the Tarim Basin and the West Kunlun Orogen shifted from a crustal-scale coupling mode with pure-shear thickening to a decoupled mode characterised by southward underthrusting of the Tarim Basin's lower crust.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"673 ","pages":"Article 113006"},"PeriodicalIF":2.6,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dietary fidelity of Miocene ungulates in the context of environmental change in the Mojave Region, western North America","authors":"Fabian Cerón Hardy ,&nbsp;Xiaoming Wang ,&nbsp;Chelsie N. Bowman ,&nbsp;Yang Wang ,&nbsp;Catherine Badgley","doi":"10.1016/j.palaeo.2025.113013","DOIUrl":"10.1016/j.palaeo.2025.113013","url":null,"abstract":"<div><div>The fossil record of mammals preserves evidence for dietary adaptations that allowed lineages to persist in dynamic ecosystems for tens of millions of years. We investigated ecological attributes of fossil mammals during the middle to late Miocene (17.5–8.5 Ma) in the western Mojave region of North America to evaluate the response of herbivorous ungulates to paleoenvironmental changes. Herbivores may utilize the same food resources across generations, relying on relationships with vegetation and habitats established over multiple generations. We employed stable isotopes of carbon and oxygen from ancient soils and herbivore tooth enamel to evaluate changes in vegetation and herbivore diets. We compiled isotopic data from published studies of three sequences from the warm Miocene Climatic Optimum and added new data from the Dove Spring Formation, which formed during the cooler Middle Miocene Climatic Transition. Herbivorous ungulates exhibited dietary fidelity for nearly nine million years, selectively consuming C₃ plants even as C₄ vegetation became more prevalent on the landscape. High oxygen stable isotope ratios in comparison to equids suggest that ancestral antilocaprids and camelids were likely facultative drinkers. These findings reveal enduring dietary preferences that enabled these herbivores to persist amid the profound environmental transitions of the Miocene.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"673 ","pages":"Article 113013"},"PeriodicalIF":2.6,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Neoproterozoic mafic magmatism (ca. 790–780 Ma) in the western Jiangnan Orogen of South China, and its implication for a slab rollback origin","authors":"Caihua Kou ,&nbsp;Yanxue Liu ,&nbsp;Jiang Li ,&nbsp;Shengkai Jin","doi":"10.1016/j.palaeo.2025.113008","DOIUrl":"10.1016/j.palaeo.2025.113008","url":null,"abstract":"<div><div>In this paper, we present geochemical data for a Neoproterozoic basalt (from Ximalian) two clinopyroxenite intrusions (Tangtou, Mahai), and three gabbroic intrusions (Datan, Longsheng, and Youziping) in the Longsheng area of northern Guangxi, China. This area is located in the western part of the Jiangnan Orogen of the South China Block. Secondary ion mass spectrometry (SIMS) U<img>Pb zircon dating of the Xiamalian basalt, Youziping gabbro, and Mahai clinopyroxenite yielded concordia ages of 786.0 ± 5.6 Ma, 788.9 ± 4.8 Ma, and 780.1 ± 4.7 Ma. Geochemically, the Ximalian basalt and Tangtou clinopyroxenite, as well as three gabbroic rocks, have arc-like geochemical affinities characterized by moderate light rare earth element (LREE) enrichment (La_N/Yb_N = 2.79–9.45), pronounced negative Nb<img>Ta anomalies, and relatively low Nb/La ratios (with an average of 0.52). They have variable εNd(t) (−4.5 to 3.9) and positive εHf(t) (6.5–8.5) values. We thus conclude that these rocks were derived from the mantle wedge in a subduction setting via partial dehydration melting of the lithospheric mantle metasomatized by dehydrated fluids. In contrast, the Mahai clinopyroxenite exhibits ocean island basalt (OIB)-like signatures, including LREE enrichment (La_N/Yb_N = 11.87–22.25), a lack of negative Nb, Ta, and Ti anomalies; and positive εNd(t) (0.5–1.5, with one exception of −2.9) and εHf (t) (3.0–3.5) values. We infer that the Mahai clinopyroxenite was generated by partial decompression melting of the upwelling asthenospheric mantle in an extensional setting. Based on the regional geology, as well as the results of this study and previous publications, we conclude that the arc-type rocks analyzed in this study were generated under geodynamic processes triggered by the rollback of the subducted slab in a subduction setting. The OIB-like rocks were related to the break-off of the rolled-back slab, which created an extensional setting and enabled asthenospheric upwelling and partial melting.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"673 ","pages":"Article 113008"},"PeriodicalIF":2.6,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of sampling strategy, alignment method and growth morphology on the temporal contextualization of high-resolution geochemical data","authors":"Lukas Fröhlich,&nbsp;Qian Huang,&nbsp;Bernd R. Schöne","doi":"10.1016/j.palaeo.2025.113003","DOIUrl":"10.1016/j.palaeo.2025.113003","url":null,"abstract":"<div><div>High-resolution proxy reconstructions of physical and ecological variables in aquatic environments are commonly derived from biogenic archives such as bivalve shells. Interpretation of geochemical data measured in circular-shaped sample spots placed along shell cross-sections requires precise temporal alignment. The latter can be challenging, because differences in growth rate, morphology and sampling methods introduce biases to the reconstructed signals. This study systematically evaluates the impact of different sampling strategies and alignment methods on the reconstruction of environmental signals, i.e., temperature oscillations and phytoplankton blooms. Synthetic environmental signals and digital shell models of the bivalve <em>Arctica islandica</em> were used to numerically simulate how environmental variables are recorded during shell growth. A novel alignment method is presented, demonstrating significantly improved reconstruction accuracy when compared to traditional techniques. The new method enhances the reliability of proxy-based environmental reconstructions using biogenic archives and offers new insights into highly dynamic environmental signals such as phytoplankton blooms.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"674 ","pages":"Article 113003"},"PeriodicalIF":2.6,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Died out at the end of Permian or extended into the Triassic? – The tale of the albaillellarians (radiolarians) and detrital zircons of the Nanpihe bridge section in the Changning-Menglian belt, Western Yunnan, China","authors":"Jianbin Zheng ,&nbsp;Xiaochi Jin ,&nbsp;Hao Huang ,&nbsp;Zhen Yan","doi":"10.1016/j.palaeo.2025.112988","DOIUrl":"10.1016/j.palaeo.2025.112988","url":null,"abstract":"<div><div>Radiolarians of the albaillellarian group, <em>Albaillella triangularis</em>, <em>Albaillella yaoi</em>, <em>Albaillella lauta</em>, <em>Albaillella protolevis</em>, <em>Albaillella levis</em>, and <em>Neoalbaillella optima</em>, are identified from the Nanpihe bridge section of the Changning-Menglian belt in western Yunnan, China. They can be correlated to those from the <em>Neoalbaillella optima</em> Zone of the Upper Permian in Japan and South China. Genera <em>Albaillella</em> and <em>Neoalbaillella</em>, which have been considered as indices of the Upper Permian, are normally believed to have vanished at the Permian-Triassic (P/T) boundary. Nevertheless, detrital zircons from five radiolarian-bearing beds of the Nanpihe bridge section yielded unimodal U<img>Pb ages indicative of Early-Middle Triassic (i.e., 241 Ma, 243 Ma, 245 Ma, 247 Ma, and 249 Ma). The exquisite preservation of delicate skeletal structures of radiolarians, their occurrence within the matrix of cherts rather than in clasts, and the absence of fossils of other ages exclude the possibility of reworking. These results indicate that the albaillellarians identified in the studied section, which were previously believed to have gone extinct during the end-Permian mass extinction, could survive into the Triassic.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"673 ","pages":"Article 112988"},"PeriodicalIF":2.6,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Astronomical Forcing of late oligocene to early Miocene Paleoclimate: A case study from the Northern South China Sea","authors":"Jianhao Liang ,&nbsp;Yaning Wang ,&nbsp;Shangfeng Zhang ,&nbsp;Chunju Huang ,&nbsp;Enze Xu ,&nbsp;Ze Zhang","doi":"10.1016/j.palaeo.2025.113007","DOIUrl":"10.1016/j.palaeo.2025.113007","url":null,"abstract":"<div><div>Astronomical forcing, such as Earth's orbital obliquity, has played a crucial role in climate evolution throughout geological history. The Qiongdongnan Basin in the South China Sea provides valuable geological records for reconstructing the paleoenvironmental conditions of the western Pacific during the late Oligocene to early Miocene. In this study, we conducted cyclostratigraphic and paleoclimatic analyses using high-resolution geophysical well-logging data, planktic foraminifera, and sporopollen from Well Ls33a. The power ratio accumulation (PRA) method indicates that among various geophysical logging parameters, natural gamma-ray (GR) data exhibit the highest sensitivity. Time series analysis reveals astronomical signals in the GR data, which were further validated through objective statistical methods such as TimeOpt, COCO, and PRA. By calibrating the interpreted 405-kyr eccentricity cycle, we developed a floating astronomical timescale spanning approximately 7.32 million years. Subsequently, based on the preliminary chronological framework derived from planktic foraminiferal biostratigraphy (∼28.4 Ma–21.12 Ma) and the La2010d theoretical astronomical solution, we established an absolute astronomical timescale for the 3547–3934 m interval of Well Ls33a, covering 28.55–21.23 Ma. Within this astronomical timeframe, we reconstructed sea-level fluctuations in the study area from the late Oligocene to early Miocene using the sedimentary noise model. Notably, the sea-level variations near the Oligocene-Miocene boundary exhibit a weak response to astronomical forcing. Further application of recurrence quantification analysis (RQA) reveals nonlinear characteristics in the region's climate evolution. By integrating sporopollen data, we classified the climate history into three distinct stages. Over long timescales, astronomical forcing is the primary driver of global climate change. However, local sedimentary and environmental variations introduce strong nonlinearities, leading to phase shifts in response to astronomical forcing. Finally, we propose a simplified model to elucidate the mechanisms by which Earth's orbital obliquity influences climate system dynamics, providing new insights into the climate evolution of the late Oligocene to early Miocene.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"673 ","pages":"Article 113007"},"PeriodicalIF":2.6,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vegetation dynamics on sunny and shady slopes and climate changes over the last 8000 years inferred from a pollen record of Lake Xiaolongchi in the Tianshan Mountains in arid Central Asia","authors":"Xinyue Wang ,&nbsp;Peizheng He ,&nbsp;Xin Mao ,&nbsp;Xingqi Liu","doi":"10.1016/j.palaeo.2025.113009","DOIUrl":"10.1016/j.palaeo.2025.113009","url":null,"abstract":"<div><div>The Tianshan Mountains have both sunny and shady slopes where the vegetation is quite different and possibly responds differently to climate changes. Lake Xiaolongchi, a small alpine lake located in Northern Tianshan Mountains of arid central Asia, is used to explore the source area of the main pollen taxa in lake sediments. Pollen data of a well-dated sediment core from Lake Xiaolognchi are analyzed to discuss vegetation dynamics on the sunny and shady slopes and their response to climate. The pollen data are used to reconstruct the temperature and humidity changes over the last 8000 years. <em>Picea</em> pollen mainly originates from the shaded slopes, while <em>Artemisia</em>, Amaranthaceae and Poaceae are mainly from the sunny slopes. Cyperaceae pollen originates primarily from the tundra vegetation in the high elevation of the catchment. Accordingly, the taiga biome score reflects changes in arboreal plants on the shady slopes of the catchment, which are sensitive to temperature. High or low taiga biome scores can be used to indicate high or low temperatures, respectively. The steppe and desert biome scores reflect steppe and desert vegetation on the sunny slopes, which are sensitive to humidity. High steppe/desert biome scores can be used to infer humid/arid climate respectively. The temperature reconstruction based on the taiga biome score exhibits a cooling trend, and the humidity reconstruction based on the steppe and desert biome scores shows a wetting trend over the past 8000 years. These trends are generally consistent with other climate records from the arid central Asia. The climate was extremely dry from 2.1 to 1.7 cal kyr BP, corresponding to the Roman Warm Period (RWP). This extremely dry event appears to be a regional signal and possibly have caused a significant decrease of archaeological sites in arid central Asia in that period.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"673 ","pages":"Article 113009"},"PeriodicalIF":2.6,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}