Holocene最新文献_第4页

Different hydrological controls causing variable rates of Holocene peat growth in a lowland valley system, north-eastern Netherlands; implications for valley peatland restoration 不同水文控制导致荷兰东北部低地河谷系统全新世泥炭生长速率的变化对河谷泥炭地恢复的启示

IF 2.4 3区地球科学

Holocene Pub Date : 2023-05-11 DOI: 10.1177/09596836231169985

B. Makaske, G. J. Maas

{"title":"Different hydrological controls causing variable rates of Holocene peat growth in a lowland valley system, north-eastern Netherlands; implications for valley peatland restoration","authors":"B. Makaske, G. J. Maas","doi":"10.1177/09596836231169985","DOIUrl":"https://doi.org/10.1177/09596836231169985","url":null,"abstract":"The Drentsche Aa valley system in the glacial sandy landscape of the north-eastern Netherlands, is one of the many regional drainage systems in the north-western to central European Lowlands. Following deep incision in the Weichselian, ca 7 m of eutrophic peat has accumulated in the lower to middle reaches of the valley system in the Holocene, completely filling the Weichselian incision. We reconstructed the rate of water-level rise controlling peat growth at three locations in the valley system (representing the upper, middle and lower reaches), using 14C peat dates from compaction-free sampling sites on the sloping valley margin where the peat directly overlies the sandy Pleistocene subsurface. The 14C dates enabled the construction of curves showing the water-level evolution at each location. Our results show variable rates of Holocene peat growth in the valley system in response to different drivers of hydrological change: a strong increase in annual precipitation (onset Holocene), a decrease in evapotranspiration (10,000–8000 cal. years BP) and relative sea-level rise (after ~4500 cal. years BP). Because the identified hydrological controls on peat growth are regional, they probably ruled Holocene peat growth in many peat-filled valley systems in the north-western to central European Lowlands. Currently, there is growing attention for these valley systems in the context of European nature restoration efforts and climate change adaptation and mitigation measures. The present study underscores that large-scale hydrological measures outside the valley system are needed for restoration of degraded valley peatlands.","PeriodicalId":50402,"journal":{"name":"Holocene","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42428182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Early afforestation on islands of proglacial Lake Ojibway as evidence of post-glacial migration outposts 前冰期奥吉布威湖岛屿上的早期造林作为冰期后移民前哨的证据

IF 2.4 3区地球科学

Holocene Pub Date : 2023-05-10 DOI: 10.1177/09596836231169988

M. Vogel, Hugo Asselin, S. Joannin, Y. Bergeron, Sabrina Leclercq, Cécile Latapy, Adam A. Ali

{"title":"Early afforestation on islands of proglacial Lake Ojibway as evidence of post-glacial migration outposts","authors":"M. Vogel, Hugo Asselin, S. Joannin, Y. Bergeron, Sabrina Leclercq, Cécile Latapy, Adam A. Ali","doi":"10.1177/09596836231169988","DOIUrl":"https://doi.org/10.1177/09596836231169988","url":null,"abstract":"At the end of the last glacial period in the northern hemisphere, meltwater from receding ice sheets accumulated into large proglacial lakes, potentially limiting postglacial afforestation. We explored whether former islands of proglacial Lake Ojibway (Canada) (hilltops in the current landscape) could have acted as migration outposts and thus accelerated the postglacial migration. We extracted sediments from two small lakes located on “paleo-islands” and used XRF to detect changes in soil erosion and vegetation biomass. We also used plant macro-remains and wood charcoal to determine if (and which) tree species colonized the sites and to detect local fire events. Organic sediment accumulation started around 9657 and 9947 cal. yr BP at Lakes Perché and Despériers, respectively, before the level of Lake Ojibway started to decrease and liberate parts of the studied landscape ca 9400 cal. yr BP. Lithogenic elements (Ti, K, Sr, Fe, Zr, and Rb) decreased between the beginning of organic sediment accumulation and 8800–8700 cal. yr BP, indicating reduced soil erosion, possibly due to soil stabilization by vegetation. Then, the S/Ti ratio, a proxy of organic matter increased around 8800 and 8400 cal. yr BP. The earliest tree macro-remains (Larix laricina and Pinus spp.) were found between 9850 and 9500 cal. yr BP. Local fires were detected around 9820 and 8362 cal. yr BP. Early afforestation occurred on the islands of Lake Ojibway, 200 and 450 years before its level started to decrease, confirming that some islands acted as migratory outposts accelerating postglacial migration.","PeriodicalId":50402,"journal":{"name":"Holocene","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44376943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 2.4 3区地球科学

Holocene Pub Date : 2023-05-08 DOI: 10.1177/09596836221145418

Peizheng He, Xingqi Liu, H. Sun, Shengnan Feng, Xin Mao

{"title":"ENSO-related centennial and millennial-scale hydroclimate changes recorded from Lake Xiaolongchi in arid Central Asia over the past 8000 years","authors":"Peizheng He, Xingqi Liu, H. Sun, Shengnan Feng, Xin Mao","doi":"10.1177/09596836221145418","DOIUrl":"https://doi.org/10.1177/09596836221145418","url":null,"abstract":"Climate changes on different timescales and their mechanisms are of great importance in arid Central Asia (ACA). However, the contribution of El Niño−Southern Oscillation (ENSO) to Holocene hydroclimate in ACA on centennial and millennial timescales is limited by records with good age control and high temporal resolution. Here, we present high-resolution X-ray fluorescence (XRF) scanning data of a sediment core from Lake Xiaolongchi in central Tianshan Mountains to reconstruct hydroclimate changes in ACA over the last 8000 years. Our construction exhibits that the climate was dry from 8000 to 5500 cal year BP and wet from 5500 to 0 cal year BP, which resembles ENSO patterns on a millennial timescale. On the centennial timescale, hydroclimate fluctuations with eight wet periods, seven dry periods, and a shift period have a significant 800-year periodicity, coincident with periodic ENSO variance. The positive relationship between 800-year band-pass filtered hydroclimate and ENSO indicates that wet (dry) climate conditions correspond to increased (reduced) ENSO activity. We propose that the spatial pattern of “wet (dry) southern China and ACA, and dry (wet) northern China” during the El Niño-like (La Niña-like) condition may exist during the Holocene on millennial to centennial timescales.","PeriodicalId":50402,"journal":{"name":"Holocene","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43311184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A guide to assess distance from ecological baselines and change over time in palaeoecological records 评估古生态记录中与生态基线的距离和随时间变化的指南

IF 2.4 3区地球科学

Holocene Pub Date : 2023-04-29 DOI: 10.1177/09596836231169986

O. Burge, S. Richardson, Jamie R. Wood, J. Wilmshurst

{"title":"A guide to assess distance from ecological baselines and change over time in palaeoecological records","authors":"O. Burge, S. Richardson, Jamie R. Wood, J. Wilmshurst","doi":"10.1177/09596836231169986","DOIUrl":"https://doi.org/10.1177/09596836231169986","url":null,"abstract":"Palaeoecology provides critical data for establishing ecological ‘baselines’, which can guide restoration efforts and be used to assess ecosystem change. However, statistical analyses can be challenging because of the large number of methods available for establishing palaeoecological baselines combined with a lack of practical guidance, particularly around quantifying baselines that include natural variability. We contribute one solution by providing guidance and an R package baselines for using palaeoecological data to (i) define baselines and (ii) test for change over time that incorporates variability. These methods provide an alternative to single-taxon analyses and allow ecosystem complexity to be captured. We use published pollen records as case studies to demonstrate how to establish vegetation baselines for seven localities in New Zealand where relatively recent (c. 1280 AD) and near-simultaneous human settlement across the country allows background environmental disturbance in the pre-human era to be distinguished from anthropogenic disturbance. We present methods for calculating distance from initial sample, distance from baseline in ordination space, allowing incorporation of ecosystem variability, and analysis of rates of change over time using principal curves. We found conventional and Bayesian ordination methods yielded similar results and were effective at identifying change following human settlement, despite the potential for a positive mean-variance relationship to confound results. Principal response curves were most sensitive to a known period of vegetation disturbance caused by volcanic eruptions at two sites with tephra deposits. Our proposed methods, case study and R package baselines are designed to provide a suite of tools to encourage and enable palaeoecological data to be used by palaeoecologists to assess trajectories and change over time, and monitor whether historical management actions have facilitated a change in direction towards a desired baseline state.","PeriodicalId":50402,"journal":{"name":"Holocene","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44379165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Holocene relative sea-level changes in northwest Ireland: An empirical test for glacial isostatic adjustment models 爱尔兰西北部全新世相对海平面变化：冰川均衡调整模型的经验检验

IF 2.4 3区地球科学

Holocene Pub Date : 2023-04-29 DOI: 10.1177/09596836231169992

J. Kirby, E. Garrett, W. Gehrels

{"title":"Holocene relative sea-level changes in northwest Ireland: An empirical test for glacial isostatic adjustment models","authors":"J. Kirby, E. Garrett, W. Gehrels","doi":"10.1177/09596836231169992","DOIUrl":"https://doi.org/10.1177/09596836231169992","url":null,"abstract":"The late-Quaternary relative sea-level (RSL) history of Ireland is complex, positioned at the margins of the former British-Irish Ice Sheet, and subject to the influence of ice unloading and forebulge collapse. Geophysical models of post-glacial isostatic adjustment (GIA) provide estimates of the pattern of RSL change since deglaciation which may be tested and validated with empirical data from proxy records. For the region of northwest Ireland, there is a paucity of high-quality RSL data and, therefore, equivocal evidence to support the GIA models that predict a mid to Late-Holocene RSL highstand of between +0.5 and +2 m above present. This study aims to investigate this model-data discrepancy by reconstructing RSL change from a near continuous salt-marsh sequence at Bracky Bridge, Donegal, spanning the last ca. 2500 years. We develop a transfer function model to reconstruct the vertical position of sea level using a regional diatom training set to quantify the indicative meaning and predict the palaeomarsh elevation of the core samples. A chronology is provided by a combination of 14C and 210Pb data, with sample specific ages derived from an age-depth model using a Bayesian framework. Our reconstruction shows ca. 2 m of relative sea-level rise in the past 2500 years. This is not compatible with some previously published sea-level index points from the region, which we re-interpret as freshwater/terrestrial limiting data. These results do not provide any evidence to support a Mid-Holocene RSL highstand above present sea level. Whilst none of the available GIA models replicate the timing and magnitude of the Late-Holocene RSL rise in our reconstruction, those which incorporate a thick and extensive British-Irish Sea Ice Sheet provide the best fit.","PeriodicalId":50402,"journal":{"name":"Holocene","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43645980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

An 11,000 year record of plant community stability and paludification in a patterned rich fen in northeastern Alberta, Canada 加拿大艾伯塔省东北部一个模式丰富的沼泽地植物群落稳定性和沼泽化的11000年记录

IF 2.4 3区地球科学

Holocene Pub Date : 2023-04-25 DOI: 10.1177/09596836231169997

D. Vitt, Melissa House

{"title":"An 11,000 year record of plant community stability and paludification in a patterned rich fen in northeastern Alberta, Canada","authors":"D. Vitt, Melissa House","doi":"10.1177/09596836231169997","DOIUrl":"https://doi.org/10.1177/09596836231169997","url":null,"abstract":"Patterned rich fens have a diverse flora and are maintained by unidirectional inflowing water with high concentrations of base cations, along with high pH and limited nutrients. Rich fens are among the most threatened ecosystems in Europe, but are not uncommon across the western boreal forest zone of Canada. Utilizing 10 radiocarbon dated cores extracted from the wetland, we investigated the Holocene developmental history of a large patterned rich fen in northeastern Alberta (McClelland Wetland). Organic matter accumulation began around 11,457 cal yr BP as primary peat formation on recently deglaciated substrates. Over the 10,000+ years history of McClelland Wetland, the central portions of the wetland have been remarkably resistant to change, with little alteration in dominant species. The resistance to change is set against a background of fluctuations in regional Holocene climate and local varying water balance. The dominant bryophyte species (Hamatocaulis vernicosus and Scorpidium scorpioides) continued to play a foundational role on site for the duration of the Holocene, dependent on a persistent long-term ground water source. Accumulation rates of organic matter have remained steady once the dominant bryophyte layer was established, but with accumulation rates at paludifying marginal sites lower than those of the central moss-graminoid-dominated areas.","PeriodicalId":50402,"journal":{"name":"Holocene","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47422944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preboreal oscillation in the light of multiproxy analyses—Early Holocene in Lake Jelonek (North Poland) 多代用物分析下的波兰北部耶洛内克湖早全新世前寒带振荡

IF 2.4 3区地球科学

Holocene Pub Date : 2023-04-25 DOI: 10.1177/09596836231169993

M. Kramkowski, Anna Filbrand-Czaja, E. Zawisza, M. Rzodkiewicz, B. Kotrys, J. Mirosław‐Grabowska, M. Błaszkiewicz, Krzysztof Szewczyk, M. Słowiński

引用次数: 0

Serving red rice beer to the ancestors ca. 9000 years ago at Xiaohuangshan early Neolithic site in south China 大约9000年前，在中国南方的小黄山新石器时代早期遗址，人们向祖先敬献红米啤酒

IF 2.4 3区地球科学

Holocene Pub Date : 2023-04-24 DOI: 10.1177/09596836231169995

Li Liu, Haiming Wang, Hanlong Sun, Xingcan Chen

引用次数: 2

Holocene chemostratigraphy of spring sediments in Range Creek Canyon, Utah, USA 美国犹他州Range Creek峡谷春季沉积物全新世化学地层学研究

IF 2.4 3区地球科学

Holocene Pub Date : 2023-04-24 DOI: 10.1177/09596836231169987

D. Ward, A. Brunelle, B. Bowen

{"title":"Holocene chemostratigraphy of spring sediments in Range Creek Canyon, Utah, USA","authors":"D. Ward, A. Brunelle, B. Bowen","doi":"10.1177/09596836231169987","DOIUrl":"https://doi.org/10.1177/09596836231169987","url":null,"abstract":"This study builds off the paleoclimatic reconstruction created by Hart et al. that used a multiproxy study to examine the role of moisture in the exodus of the Fremont from Range Creek Canyon in the 12th century. For this research, elemental ratios, weathering indices, and pollen data from two wetland spring sediment cores were used to compare with the existing Hart et al. paleoclimatic reconstruction (Objective 1). Elemental ratios and pollen data proved to be effective proxies for precipitation fluctuation, with the ratio of Pinus to Juniperus pollen representing effective moisture and increasing with the intensity of chemical weathering. Elemental data were additionally used to identify crypto tephra in the cores to validate Range Creek Canyon’s existing chronology (Objective 2). The XRF analysis of the sediment cores constrained the chronology of environmental change in the canyon by identifying the elemental signature of the Mazama eruption (7627 ± 150 cal. year BP). The concentration of Al, Y, and Ti were 50 times higher in this layer than elsewhere in the core, indicating a sudden depositional event, such as a volcanic eruption. Based on the multiproxy data and confirmed chronology, the Fremont entered the canyon during a period of elevated precipitation lasting until 600 AD. Precipitation levels remained steady until 1200 AD, after which precipitation levels decreased, causing drought conditions that coincide with the Fremont’s departure from Range Creek Canyon.","PeriodicalId":50402,"journal":{"name":"Holocene","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43772883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Driving forces and determinants of barrier coast evolution in the Holocene observed on the southern coast of the Baltic Sea 波罗的海南部海岸观测到的全新世屏障海岸演变的驱动力和决定因素

IF 2.4 3区地球科学

Holocene Pub Date : 2023-04-21 DOI: 10.1177/09596836231163507

P. Sydor, S. Uścinowicz

{"title":"Driving forces and determinants of barrier coast evolution in the Holocene observed on the southern coast of the Baltic Sea","authors":"P. Sydor, S. Uścinowicz","doi":"10.1177/09596836231163507","DOIUrl":"https://doi.org/10.1177/09596836231163507","url":null,"abstract":"Coastal barriers account for approximately one-eighth of the world’s coastline. Barriers are the most common landform type in the southern part of the Baltic Sea area. Despite the long history of research, the issue of barrier coast evolution remains unresolved. The topic of this research is to determine the conditions under which the barrier coast evolved in the Holocene and to explain the local, different histories of its development. A 35 km long stretch of the coastal zone in the eastern Pomeranian Bay (southern Baltic) was explored using boreholes, seismoacoustic and GPR profiling, as well as radiocarbon and OSL dating, biostratigraphic studies and lithological analysis. Three main groups of deposits were identified: barrier subsoil deposits, barrier deposits (marine and aeolian sand, as well as interdune peat) and Rega River delta deposits. In the early Northgrippian (~8000 yr b2k), the coastline was located from about 2 to 12 km north of its present position. In the period 8000–6000 yr b2k, the coastline migrated southwards (landwards), initially at a rate of up to 22 m/yr and later up to 2 m/yr. The main driving forces at that time were climate warming and rapid sea level rise. When the Holocene transgression ceased, there were three different histories of the barrier coast development in the study area: a barrier that was still transgressive, a barrier that evolved from transgressive to progradational, and a barrier that evolved from transgressive trough progradational to transgressive again. The main determinants of these different histories were the lithology and relief of the barrier subsoil (accommodation space) and the time-varying amount of sand available for barrier formation, which varied in different parts of the study area.","PeriodicalId":50402,"journal":{"name":"Holocene","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47148256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1