Review of Palaeobotany and Palynology最新文献_第2页

Modern palynological assemblages from nearby Mediterranean coastal lagoons: implications for palaeoecological interpretation 来自地中海沿岸泻湖的现代孢粉组合：古生态学解释的含义

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-04-01 Epub Date: 2026-01-12 DOI: 10.1016/j.revpalbo.2026.105502

Federica Badino , Adele Bertini , Matteo Pili , Rossano Ciampalini , Davide Baroni , Giacomo Querci , Cècile Vittori , Jean-Philippe Goiran

Site-specific modern pollen assemblages are essential for interpreting fossil records, yet their links to local conditions and surrounding landscapes are often poorly understood. This study presents a modern palynological dataset from subsurface sediments of the shallow Burano and Orbetello lagoons in Tuscany, Italy. This dataset is part of a broader project which includes fossil sediment cores from the same basins. Spatially distributed samples were analyzed for grain-size, pollen, non-pollen palynomorphs, and sieved charcoal, with water physico-chemical parameters measured at each site. Terrestrial pollen assemblages mainly reflect regional wind-pollinated vegetation but show strong distortions, with forests overrepresented and open areas—especially cereal crops and vineyards—underrepresented. Modern calibration of Pinus and Olea pollen registrations is particularly informative given their key role in local human-driven landscape change. Sieved charcoal (> 125 μm), a proxy for local fire, is unevenly distributed and correlated with Glomus chlamydospores, indicating additional transport via runoff. At Burano, intra-basin pollen deposition is largely controlled by morphometric and sedimentological factors which explain 58.1% of the observed variance. In contrast, at the Orbetello lagoon, these factors explain only 26.7% of the variance, reflecting more complex hydrodynamic controls on sediment and pollen redistribution. Among aquatic groups, brackish macrophytes dominate across broad salinity ranges, primarily controlled by water depth, salinity, and associated with dissolved oxygen. Microalgal groups respond to temperature and nutrient availability, with high concentrations of harmful algae (Alexandrium spp.) indicating ecological stress. Overall, this modern spatial dataset provides a site-specific framework for interpreting fossil records and reconstructing past environmental changes. It also demonstrates the potential of combining palaeoecological research with modern data to translate scientific knowledge into practical applications for biodiversity conservation.

特定地点的现代花粉组合对于解释化石记录至关重要，但它们与当地条件和周围景观的联系往往知之甚少。本研究提出了一个来自意大利托斯卡纳浅层Burano和Orbetello泻湖地下沉积物的现代孢粉学数据集。该数据集是一个更广泛的项目的一部分，该项目包括来自同一盆地的化石沉积物岩心。分析了空间分布样品的粒度、花粉、非花粉形态和筛过的木炭，并在每个站点测量了水的物理化学参数。陆生花粉组合主要反映区域风媒传粉植被，但表现出强烈的扭曲，森林代表性过高，开阔地区（尤其是谷类作物和葡萄园）代表性不足。考虑到松树和油橄榄花粉在当地人为驱动的景观变化中的关键作用，现代校准的信息尤其丰富。筛过的木炭（> 125 μm）是当地火灾的代表，其分布不均匀，与球囊菌（Glomus chlamydo孢子）相关，表明通过径流进行了额外的运输。在Burano，盆地内的花粉沉积主要受形态计量学和沉积学因素的控制，它们解释了58.1%的观测方差。相比之下，在Orbetello泻湖，这些因素只解释了26.7%的差异，反映了沉积物和花粉再分配的更复杂的水动力控制。在水生类群中，微咸大型植物在广泛的盐度范围内占主导地位，主要受水深、盐度和溶解氧的控制。微藻群对温度和营养物质的可用性有反应，高浓度的有害藻类（Alexandrium spp.）表明生态压力。总的来说，这个现代空间数据集为解释化石记录和重建过去的环境变化提供了一个特定地点的框架。它还展示了将古生态学研究与现代数据结合起来，将科学知识转化为生物多样性保护的实际应用的潜力。

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引用次数: 0

Oligocene coniferous woods of the Petroșani Basin, South Carpathians, Romania 罗马尼亚南喀尔巴阡山脉Petroșani盆地的渐新世针叶林

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-04-01 Epub Date: 2026-01-17 DOI: 10.1016/j.revpalbo.2026.105512

Alexandru Gabriel Călin, Mihai Emilian Popa, Roxana Pirnea

The Petroșani Basin of the South Carpathians, Romania, yields frequent permineralized wood material confined to the Chattian, coal bearing Dâlja-Uricani Formation. This study represents the first comprehensive taxonomic and systematic investigation of the basin's permineralized flora, in the larger area of the South Carpathians which until now remained largely unstudied for Oligocene woods. The newly collected material belongs to Family Cupressaceae sensu lato and is assigned to two genera: Taxodioxylon and Glyptostroboxylon, with four species: Taxodioxylon germanicum (Greguss) Van der Burgh, T. taxodii Gothan, T. gypsaceum (Göppert) Kräusel, and Glyptostroboxylon rudolphii Dolezych et Van der Burgh. The assemblage represents primary coal generators of a conifer dominated swamp vegetation that developed under a warm-temperate, humid climate in Petroșani Basin during the Late Oligocene.

Petroșani南喀尔巴阡山脉盆地，罗马尼亚，生产频繁的过矿化木材材料仅限于茶田，含煤的d lja- uricani组。这项研究代表了对盆地过矿化植物群的第一次全面的分类和系统的调查，在南喀尔巴阡山脉的更大范围内，直到现在还没有对渐新世森林进行研究。新收集的材料属于柏科sensu lato，分属Taxodioxylon和Glyptostroboxylon 2属，有Taxodioxylon germanicum (Greguss) Van der Burgh、t.t taxodii Gothan、t.g ypsaceum (Göppert) Kräusel和Glyptostroboxylon rudolphii Dolezych et Van der Burgh 4种。该组合代表了晚渐新世Petroșani盆地暖温带湿润气候下以针叶树为主的沼泽植被的初级产煤装置。

引用次数: 0

Pliocene humid subtropical climate in Central Yunnan (SW China) and the anthropogenic warming-driven extinction threat to Nyssa species 滇中上新世湿润亚热带气候及人为变暖对沙蚕物种的灭绝威胁

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-04-01 Epub Date: 2026-01-22 DOI: 10.1016/j.revpalbo.2026.105514

Ping Lu , Jian-Wei Zhang , De-Liang Li , Xiao-Qing Liang

Persistent anthropogenic climate warming is one of the major drivers behind the large-scale extinction of species. To investigate the extinction mechanisms of plant taxa originating from warm and humid geological periods under contemporary climate warming, this study utilized endocarp (fruit pits) fossils of Nyssa sibirica P. I. Dorof. ex Zhilin discovered in southwestern China, combined with fossil records and current distribution data of the genus, and employed ecological niche modeling to systematically reconstruct the historical distribution patterns and future potential distribution areas of the Nyssa genus. The research indicated that the presence of Nyssa sibirica (closely related to the endemic North American southeastern species N. sylvatica and N. biflora) in central Yunnan suggested that the region experienced a humid subtropical climate during the Pliocene. Phytogeographical evidence further revealed that Nyssa species (including N. sibirica) originated in warm and humid environments millions of years ago. However, due to their limited adaptability to global climate cooling, their distribution ranges gradually contracted southward during the Neogene. Additionally, simulations using the BioClim model showed that even under a scenario where global temperatures rise by no more than 1.5 °C compared to pre-industrial levels, the distribution ranges of extant Nyssa species have not expanded but have instead generally undergone significant reduction, with some species (such as N. sinensis and N. talamancana) even facing the risk of extinction. Therefore, strict adherence to the temperature control targets of the Paris Agreement is a critical measure for protecting these ancient plant taxa.

持续的人为气候变暖是导致物种大规模灭绝的主要原因之一。为了探讨在当代气候变暖背景下起源于温暖湿润地质时期的植物类群的灭绝机制，本研究利用了Nyssa sibirica p.i. Dorof的内果皮（果核）化石。结合化石记录和现有分布资料，采用生态位建模方法，系统地重建了Nyssa属的历史分布格局和未来潜在分布区域。研究表明，云南中部地区存在与北美东南部特有物种N. sylvatica和N. biflora密切相关的Nyssa sibirica，表明该地区在上新世经历了湿润的亚热带气候。植物地理学证据进一步表明，Nyssa物种（包括Nyssa sibirica）起源于数百万年前温暖湿润的环境。但由于对全球气候变冷的适应能力有限，其分布范围在新近纪逐渐向南收缩。此外，利用BioClim模型进行的模拟表明，即使在全球气温与工业化前相比上升不超过1.5°C的情况下，现存Nyssa物种的分布范围也没有扩大，而是普遍显著减少，其中一些物种（如N. sinensis和N. talamancana）甚至面临灭绝的风险。因此，严格遵守《巴黎协定》的温控目标是保护这些古老植物类群的关键措施。

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引用次数: 0

The biostratigraphy and biogeography of Middle Jurassic (late Bajocian to Bathonian) dinoflagellate cysts from the Barents Sea 巴伦支海中侏罗统（巴约世晚期至巴托世）鞭毛藻囊的生物地层学和生物地理学

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-04-01 Epub Date: 2026-01-21 DOI: 10.1016/j.revpalbo.2026.105515

Morten Smelror

The Barents Sea region was an important pathway for Jurassic-Cretaceous marine microplankton and faunal migration and is a key area for high-resolution bio- and sequence-stratigraphic correlations within the Panboreal Superrealm. New records of Late Bajocian-Bathonian dinoflagellate cysts assemblages in ammonite zone correlated strata in the Central Barents Sea are compared with contemporaneous assemblages from Central Europe and diachronic first and last appearances are noted. Species diversities areas are generally low, and calculated diversities and similarity-indexes between the Barents Sea dinoflagellate cyst assemblages and contemporaneous assemblages in Canadian Arctic, East Greenland, NW and Central Europe, Iran, Morrocco and Australia indicate limited biogeographic connections in Late Bajocian-Early Bathonian times compared to in Late Bathonian to Early Oxfordian times. The Late Bajocian- mid Bathonian biogeographic differences, and the following Late Bathonian-Early Oxfordian increase in similarities among world-wide dinoflagellate cyst assemblages, coincide with breakdowns of land-barriers, major transgressions, radiation of cyst-producing dinoflagellates and migration of marine biotas between Boreal, Sub-Boreal and Tethyan seas.

巴伦支海地区是侏罗纪-白垩纪海洋浮游生物和动物迁徙的重要通道，也是泛北方超领域高分辨率生物和层序地层对比的关键区域。本文将巴伦支海中部菊石带相关地层中晚巴约世—巴深世鞭毛藻囊组合的新记录与同期中欧的组合进行了比较，并指出了前后的历时性。物种多样性区域普遍较低，巴伦支海鞭毛藻囊组合与加拿大北极、东格陵兰、西北和中欧、伊朗、摩洛哥和澳大利亚同时期组合的计算多样性和相似性指数表明，与晚巴若世-早Bathonian相比，晚Bathonian -早牛津时代的生物地理联系有限。巴约世晚期-巴托世中期的生物地理差异，以及随后的巴托世晚期-牛津世早期世界范围内鞭毛藻包囊组合相似性的增加，与陆地屏障的破坏、主要海侵、产生包囊的鞭毛藻的辐射以及海洋生物在北方海、亚北方海和特提斯海之间的迁移相吻合。

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引用次数: 0

Integrated palynological and ammonoid data from the uppermost Jurassic (Tithonian) deposits of Brzostówka, Poland, and its biostratigraphical and paleoenvironmental implications 波兰Brzostówka上侏罗统（铁桑系）沉积物的孢粉和氨化物综合资料及其生物地层和古环境意义

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-04-01 Epub Date: 2026-01-12 DOI: 10.1016/j.revpalbo.2026.105511

Iván R. Barreiro , Artai A. Santos , Sreepat Jain , Mariusz A. Salamon , José B. Diez

During the Late Jurassic, Earth experienced significant environmental changes impacting both marine and terrestrial ecosystems. This study combines new palynological and ammonite associations from the Brzostówka section, central Poland. The work aims to improve the stratigraphical resolution using ammonoid-based dating and interpret the paleoenvironment and paleoecology of the marine and terrestrial communities during the latest Jurassic. Ammonites Blaschkeiceras sp. and Ernstbrunnia sp. are identified underlying the newly reported palynological association belonging to the Standard Tethyan Fallauxi Zone. Both marine (more abundant) and terrestrial palynomorphs are reported. A total of 42 morphotypes were identified, and key taxa such as Cicatricosisporites sp., Wrevittia diutina, Pilosidinium myriatrichum, Dingodinium jurassicum, and Dingodinium minutum were used for age assignment corresponding to the upper part of the lower Tithonian, consistent with ammonite biozonation. The presence of ammonites and the dominance of marine palynomorphs indicates a marine or paralic depositional environment, likely within the neritic zone. The marine fraction of the palynological association is dominated by Gonyaulacales and indicates an environment with low nutrient availability. The plant communities, likely located in coastal areas close to the depositional site, were dominated by Cheirolepidiaceae conifers suggesting warm conditions. Additionally, the presence of other gymnosperm pollen and diverse spores of pteridophytes and bryophytes unveil the presence of a variety of plant families living in the area, with several ferns and mosses families inhabiting humid environments near freshwater sources.

在晚侏罗纪时期，地球经历了影响海洋和陆地生态系统的重大环境变化。这项研究结合了波兰中部Brzostówka剖面的新孢粉和菊石组合。本研究旨在利用氨态测年技术提高地层分辨率，解释晚侏罗世海洋和陆地群落的古环境和古生态。在新报道的属于标准特提斯法劳西带的孢粉学关联中，发现了Ammonites Blaschkeiceras sp.和Ernstbrunnia sp.。海洋（更丰富）和陆地的形态都有报道。共鉴定出42种形态型，并以Cicatricosisporites sp.、Wrevittia diutina、Pilosidinium myriatrichum、Dingodinium jurassum和Dingodinium minutum等关键分类群为下梯统上半期，与菊石生物分带一致。菊石的存在和海相地貌的优势表明一个海相或近岸沉积环境，可能在浅海带内。孢粉群落的海洋部分主要由Gonyaulacales组成，表明其环境中营养物质的有效性较低。植物群落可能位于靠近沉积地点的沿海地区，以针叶树科针叶树为主，表明气候温暖。此外，裸子植物花粉和多种蕨类植物和苔藓植物孢子的存在揭示了该地区生活着各种植物科，一些蕨类植物和苔藓类植物生活在靠近淡水水源的潮湿环境中。

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引用次数: 0

Phytolith-based vegetational reconstruction from Jumping Grass Marsh, Minjerribah, in the Australian subtropics 澳洲亚热带Minjerribah跳草沼泽植岩植被重建

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-04-01 Epub Date: 2026-01-02 DOI: 10.1016/j.revpalbo.2026.105500

Manoshi Hazra , Alison Crowther , Patrick Moss , John Tibby , Francesca McInerney , Sangbaran Ghoshmaulik , Melodina Fabillo , Khairun Nisha Bte Mohamed Ramdzan , Kevin Welsh

Phytoliths are a valuable tool for reconstructing localized past vegetation, particularly in Restionaceae rich peatlands of subtropical Australia. Despite the significance of subtropical Australia for understanding vegetation–climate dynamics during the Last Glacial Maximum (LGM), no continuous phytolith records have previously been reported from subtropical eastern Australia. Jumping Grass Marsh, located on Minjerribah (North Stradbroke Island), preserves a 2.5 m organic-rich sequence extending from 27 ka BP to the present. This study reconstructs long-term vegetation dynamics using the phytolith record and evaluates how wetland taxa, grasses, and fire responded to past environmental changes in the subtropics. Phytoliths were extracted at 10 cm intervals, with 22 morphotypes identified and classified following ICPN 2.0 standards. A modern reference collection from wetland plants and soils supported taxonomic attribution, while complementary evidence from microcharcoal, sediment organic matter, and particle-size analysis refined palaeoenvironmental interpretation. The phytolith record demonstrates long-term persistence of restiad wetlands from the early glacial period (> 22 ka) to the present, with Restionaceae morphotypes dominating throughout. Grass abundance increased during the Last Glacial Maximum and reached its peak in the deglacial phase (∼ 15.7 ka). Enhanced moisture availability in the Holocene (∼ 12–0 ka) supported the expansion of Cyperaceae-specific morphotypes. Microcharcoal and discolored phytoliths suggest fire episodes around ∼ 14.4 ka and ∼ 3.3 ka. Diatom evidence (Pinnularia sp.) indicates acidic wetland conditions in the early Holocene. Modern soils show increased Panicoideae morphotypes, reflecting natural inputs and introduced grasses. Phytoliths robustly reflect vegetation history and enhance multi-proxy reconstructions of subtropical wetlands.

植物岩是重建局部过去植被的有价值的工具，特别是在澳大利亚亚热带富含retionaceae的泥炭地。尽管澳大利亚亚热带对了解末次盛冰期植被-气候动态具有重要意义，但澳大利亚东部亚热带地区没有连续的植物岩记录。跳跃草沼泽位于Minjerribah（北Stradbroke岛），保存了从27ka BP到现在的2.5米富含有机物的序列。本研究利用植物岩记录重建了长期植被动态，并评估了亚热带湿地分类群、草和火对过去环境变化的响应。每隔10 cm提取植岩，鉴定出22种形态，并按照ICPN 2.0标准进行分类。来自湿地植物和土壤的现代参考资料支持了分类归属，而来自微炭、沉积物有机质和粒度分析的补充证据完善了古环境解释。植物岩记录表明，从早期冰川期（> 22ka）到现在，休止湿地长期持续存在，并以休止科形态类型占主导地位。末次盛冰期草丰度增加，在去冰期（~ 15.7 ka）达到顶峰。全新世（~ 12-0 ka）水分有效性的增强支持了苏科特有形态的扩展。微炭和变色的植物岩表明大约在~ 14.4 ka和~ 3.3 ka发生过火灾。硅藻证据（Pinnularia sp.）表明全新世早期的酸性湿地环境。现代土壤禾本科形态类型增加，反映了自然输入和引进的禾本科。植物岩能较好地反映亚热带湿地的植被历史，增强了亚热带湿地的多代理重建。

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引用次数: 0

An exceptional plant mesofossil assemblage from the Kungurian (early Permian) locality of Gorl (Southern Alps, northern Italy) 来自Gorl（南阿尔卑斯山，意大利北部）Kungurian（早二叠世）地区的一个特殊的植物中化石组合

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-04-01 Epub Date: 2026-01-02 DOI: 10.1016/j.revpalbo.2026.105499

Matias Delfosse-Allain , Roberta Branz , Iván R. Barreiro , Evelyn Kustatscher

Plant meso-fossils are crucial in paleobotanical studies, including taxonomy, paleoecology and plant–animal interactions. However, Cisuralian (early Permian) plant meso-remains such as dispersed cuticles, wood fragments and pollen aggregate, are extremely rare. One exceptional outcrop yielding late Kungurian plant mesofossils is Gorl in the Athesian Volcanic District (Northern Italy). Dispersed cuticles confirm the presence of Peltaspermales and describe the cuticle of conifer shoots previously assigned to Hermitia and ten new cuticle morphotypes. Five of these belong to conifers, one belongs to the Peltaspermales, whereas the botanical affinity of the other four remains uncertain. Dispersed cuticles yielded also traces of plant–animal interactions of the piercing and sucking type. A megaspore confirms the presence of lycophytes in the flora. Two types of pollen aggregates yielded Protohaploxypinus-type pollen. Statistical analysis on the epidermal pattern of the leaves of Conifer morphotype 3 and Dwarf shoot type 1 demonstrates that these two taxa belong to the same biological species. The mesofossils integrate the macro- and micro-fossil record increasing the diversity on this late Kungurian site.

植物中化石在古植物学研究中具有重要意义，包括分类学、古生态学和动植物相互作用。然而，早二叠世的植物中遗遗存如分散的角质层、木屑和花粉聚集体等极为罕见。在亚齐斯火山区（意大利北部）的Gorl是一个例外的产出昆古里晚期植物中化石的露头。分散的角质层证实了peltasper雄性的存在，并描述了先前归属于Hermitia的针叶树芽的角质层和十种新的角质层形态。其中五种属于针叶树，一种属于Peltaspermales，而其他四种的植物亲和性仍不确定。分散的角质层也发现了刺穿和吮吸类型的植物与动物相互作用的痕迹。大孢子证实了植物区系中存在石松植物。两种类型的花粉聚集体产生原haploxypinus型花粉。对3型针叶和1型矮枝叶片表皮形态的统计分析表明，这两个类群属于同一生物种。中化石整合了宏观和微观化石记录，增加了昆古里晚期遗址的多样性。

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引用次数: 0

Unlocking the architecture of ancient charophyte fructifications: The utricle of Sycidium from the Upper Devonian of Armenia 解锁古代蕨类植物果实的结构：来自亚美尼亚上泥盆世的Sycidium的胞囊

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-03-01 Epub Date: 2025-12-22 DOI: 10.1016/j.revpalbo.2025.105498

Carles Martín-Closas , Vahram Serobyan , Nune Avagyan , Gayane Grigoryan , Armine Khacahtryan , Olev Vinn , Taniel Danelian

Sycidium is one of the most emblematic charophyte genera of the Palaeozoic, characterised by its peculiar morphology, temporally persistent fossil record and cosmopolitan distribution. In this study, we present novel insights into the bilateral symmetry of the utricle, based on a previously overlooked character observed in a well-preserved assemblage of Sycidium cf. spinuliferum from the Upper Devonian of Armenia. Notably, a distinct cell wall gap is present between adjacent polygonal cells within a row, facilitating intercellular connectivity and suggesting that these rows functioned as a cohesive structural unit. This configuration supports a revised symmetry model for the utricle, expressed as (2-1-3-1-2) × 2, where the numbers denote groups of cell rows interconnected via wall gaps. The Armenian material further shows that the presumed oospore was directly enclosed within the utricle, lacking a gyrogonite. Small canals in the poles of polygonal cells may have enabled limited exchange between the egg cell and the external environment through the thick utricle wall. The prominent central canal is interpreted as the last repository of the cytoplasm during the final stages of a centripetal calcification. Additionally, this study documents a previously unrecognised mode of calcification in charophytes characterised by a spongy microstructure. These findings collectively reinforce the hypothesis that Sycidium represents an independent evolutionary lineage within the Charophyta.

枸杞属是古生代最具代表性的蕨类植物属之一，具有独特的形态、时间上持久的化石记录和世界性的分布。在这项研究中，我们提出了新的见解，对双侧对称性的胞室，基于一个以前被忽视的特征，观察到保存完好的Sycidium c.s spinuliferum来自上泥盆世亚美尼亚。值得注意的是，一行内相邻的多边形细胞之间存在明显的细胞壁间隙，促进了细胞间的连通性，并表明这些行作为一个内聚的结构单元发挥作用。这种结构支持修改后的胞室对称模型，表示为（2-1-3-1-2）× 2，其中数字表示通过壁间隙相互连接的细胞行组。亚美尼亚材料进一步表明，假定的卵孢子直接被包裹在胞室内，没有螺纹石。多角形细胞两极的小通道可能使卵细胞和外部环境之间通过厚的胞壁进行有限的交换。在向心钙化的最后阶段，突出的中央管被解释为细胞质的最后储存库。此外，本研究记录了一种以前未被认识到的钙化模式，其特征是海绵状微观结构。这些发现共同加强了一种假设，即水合子代表了一种独立的进化谱系。

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引用次数: 0

The paleoclimatic footprint in the terrestrial net primary productivity of the northern Tibetan Plateau

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-03-01 Epub Date: 2025-12-11 DOI: 10.1016/j.revpalbo.2025.105496

Anning Cui , Jianping Zhang , Xingqi Liu , Deke Xu , Hao Li , Baoshuo Fan , Houyuan Lu

Accurately estimating the net primary productivity (NPP) accumulated by vegetation during the geological periods and explore its relationship to climatic factors is crucial for assessing terrestrial ecosystem function and global carbon cycle. As the vital component of the terrestrial ecosystem, the Tibetan Plateau (TP) stores substantial NPP and is sensitive to climate changes. However, the current NPP records over the TP are generally limited to recent decades due to lack of effective proxy of paleo-NPP, and mainly focus on its response to temperature change. Here, we present a paleo-NPP record quantitatively reconstructed from fossil pollen assemblages in the northern TP during the past two millennia and discussed its response to precipitation. The results revealed the dynamics of paleo-NPP closely related to the content of Artemisia and Chenopodiaceae, showed positive correlation with Artemisia and negative correlation with Chenopodiaceae. Additionally, the paleo-NPP showed a closely relationship with the precipitation during the rainy season, which are coincide with the growth season of the alpine plants. This study suggested the significant effects of seasonal precipitation on the terrestrial NPP during the past two millennia and provide a new perspective for understanding terrestrial ecosystem carbon cycle.

准确估算地质时期植被积累的净初级生产力（NPP）并探讨其与气候因子的关系，对于评估陆地生态系统功能和全球碳循环具有重要意义。然而，由于缺乏古NPP的有效替代指标，目前青藏高原的NPP记录一般局限于近几十年，主要集中在其对温度变化的响应上。本文通过对青藏高原北部近2000年的花粉化石组合进行定量重建，并讨论了其对降水的响应。结果表明，古npp动态与蒿属和藜科植物含量密切相关，与蒿属植物呈正相关，与藜科植物呈负相关。此外，古npp与雨季降水密切相关，雨季降水与高山植物生长季节一致。本研究揭示了近两千年来季节性降水对陆地NPP的显著影响，为认识陆地生态系统碳循环提供了新的视角。

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Sublagenicula echinata sp. nov., a new sigillarian in situ megaspore from the Early Permian of Inner Mongolia, China 内蒙古早二叠世原位大孢子一新种——刺棘亚种（subblagenicula echinata）

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology

Pub Date : 2026-03-01 Epub Date: 2025-12-10 DOI: 10.1016/j.revpalbo.2025.105493

Muhammad Imran Asghar , Jiři Bek , Josef Pšenička , Jun Wang

A new sigillarian megaspores species Sublagenicula echinata sp. nov., preserved in situ within a volcanic ash bed from the Early Permian (Asselian) Taiyuan Formation, Wuda Coalfield, Inner Mongolia is proposed. The species is distinguished by a circular to subtriangular amb, prominent trilete rays and a pyramidal subgula. The proximal-distal body bears a unique combination of laevigate, granulate, and echinate sculpture, with the echinate processes being mamillate at base and apically constricted. Analysis of the in situ megaspore population reveals a consistent range of intraspecific morphological variation, which is independent of developmental context of spores and found across the strobili. This discovery represents the first and youngest in-situ record of Sublagenicula, confirming its biological link to Sigillaria and significantly expanding the known paleogeographic distribution and diversity of this genus in the Permian of Cathaysia.

在内蒙古乌达煤田早二叠世（阿塞利世）太原组的火山灰床中，发现了一种新的大孢子虫亚种（subblagenicula echinata sp. nov.）。该物种的特点是圆形到近三角形的脚，突出的三边形射线和金字塔状的下腭。近端至远端体具有独特的锯齿状、颗粒状和刺状雕刻的组合，刺状突起在基部呈乳状，顶端狭窄。对原位大孢子种群的分析揭示了种内形态变异的一致范围，这种变异与孢子的发育环境无关，并在整个球果中发现。这一发现是第一次也是最年轻的现场记录，证实了其与Sigillaria的生物学联系，并显著扩大了该属在华夏二叠纪的已知古地理分布和多样性。

引用次数: 0