http://ir.isl.ac.cn:80/handle/363002/4 2026-07-01T10:29:00Z 2026-07-01T10:29:00Z Song, Yougui Li, Yue Li, Yun An, Zhisheng Cheng, Liangqing Sun, Huanyu Orozbaev, Rustam http://ir.isl.ac.cn:80/handle/363002/34513 2022-03-29T08:15:26Z 2022-03-29T08:15:26Z

题名: North Atlantic Abrupt Climate Signals during the Last Glacial Period in Central Asia Evidences from Aeolian Loess Sediments 作者: Song, Yougui; Li, Yue; Li, Yun; An, Zhisheng; Cheng, Liangqing; Sun, Huanyu; Orozbaev, Rustam

2022-03-29T08:15:26Z 彭章旷, 李海军, 柴小丽, 肖应凯, 张艳灵, 杨 剑, 马云麒 http://ir.isl.ac.cn:80/handle/363002/34511 2022-03-29T08:15:23Z 2022-03-29T08:15:23Z

题名: 石盐中硼含量及其同位素的准确测定 作者: 彭章旷, 李海军, 柴小丽, 肖应凯, 张艳灵, 杨 剑, 马云麒 摘要: 基于Cs2BO+2的正热电离质谱法测定样品中硼同位素时，硼含量的准确测定直接制约着硼同位素测定的成败。目前，使用电感耦合等离子体原子发射光谱仪(ICP-OES)测定高盐样品的硼含量仍然存在很大问题，主要体现在两个方面： 高盐的基体干扰和仪器检出限制约，而仅仅依靠简单的稀释无法很好的解决这些困难。因此对样品进行硼元素的预富集以及基体离子的去除是十分必要的。在使用硼特效树脂进行硼元素的吸附时发现部分钠离子也会被同时吸附，故采用3 mol·L-1的氨水可以洗脱大部分吸附的钠离子而不造成硼的损失，达到了去除基体的目的。随后使用10 mL 75 ℃的0.1 mol·L-1盐酸将硼特效树脂吸附的硼洗脱实现了样品中硼的富集。ICP-OES测定硼含量时，选择波长为208.900 nm，样品的加标回收率在106.00%～108.40%之间，检出限为0.006 mg·L-1，定量下限为0.02 mg·L-1。通过不同盐度下的12次重复实验，其相对标准偏差小于5%，在1.94%～3.37%之间，因此该方法是可行的，并不存在偶然误差。联合此方法和Cs2BO+2离子的正热电离质谱法，成功测定了8个地质石盐样品的硼含量及硼同位素组成。

2022-03-29T08:15:23Z Zeng, Fangming Xiang, Shuyuan http://ir.isl.ac.cn:80/handle/363002/34512 2022-03-29T08:15:23Z 2022-03-29T08:15:23Z

题名: Geochronology and Mineral Composition of the Pleistocene Sediments in Xitaijinair Salt Lake Region, Qaidam Basin Preliminary Results 作者: Zeng, Fangming; Xiang, Shuyuan 摘要: Xitaijinair (XT) Salt Lake, located in the western Qaidam Basin, is significant for reconstructing the evolution of inland drying climate. However, the chronological and mineralogical records from this lake are rare. This study investigated the chronology (accelerator mass spectrometry (AMS) C-14 ages and optically stimulated luminescence (OSL) ages) and mineral compositions of sediment in the 240-cm-deep XT Section of the Xitaijinair Salt Lake region. The conclusions are drawn as follows: (1) Nine AMS C-14 ages, ranging between 33 and 40 cal ka BP, are obviously younger than the two OSL ages (57.9 and 69.1 ka). The C-14 ages probably reflect contamination with modern carbon. (2) Both C-14 and OSL ages indicate that the surface of Xitaijinair Salt Lake region has suffered erosion. (3) The sediments of XT Section are composed of silicates (quartz, muscovite, clinochlore and albite), carbonates (calcite, dolomite, and ankertie), halite and gypsum.

2022-03-29T08:15:23Z Zeng, Fangming Liu, Xiangjun Li, Xiangzhong E, Chongyi http://ir.isl.ac.cn:80/handle/363002/34510 2022-03-29T08:15:20Z 2022-03-29T08:15:20Z

题名: Aquatic Species Dominate Organic Matter in Qinghai Lake during the Holocene Evidence from Eolian Deposits around the Lake 作者: Zeng, Fangming; Liu, Xiangjun; Li, Xiangzhong; E, Chongyi 摘要: Total organic carbon (TOC) in lake sediments and its stable carbon isotope (delta C-13(org)) are widely applied to investigate paleoenvironmental changes even though their implications are complicated and multi -explanatory. Organic geochemistry studies of lake sediments from Qinghai Lake have been investigated, but some interpretations are controversial. In this study, TOC of one Holocene eolian section and delta C-13(org) of three eolian sections were studied around Qinghai Lake. Results indicate that the TOC content in eolian deposits was low during the Early Holocene, and gradually increased to high values during the Middle and Late Holocene. The variation in TOC content of eolian deposits is different from that in the lacustrine sequence from Qinghai Lake during the Holocene. The delta C-13(org) values in the eolian sections were relatively stable, with oscillation amplitudes of similar to 4 parts per thousand (ranging from -25.8 parts per thousand to -22.1 parts per thousand), in contrast to similar to 10 parts per thousand variations in delta C-13(org) values (varying from -30 parts per thousand to -20 parts per thousand) in lacustrine sediments. Through comparison of TOC and delta C-13(org) values between eolian deposits and lacustrine sediments, we can confirm indications that the organic matter in Qinghai Lake sediments during the Holocene was primarily a contribution of the aquatic species in the lake. This is significant for understanding the origin of organic matter in lake sediments on the northeastern Qinghai -Tibetan Plateau and for paleoenvironmental inferences using such proxies.

2022-03-29T08:15:20Z Yuan, Qin Vajda, Vivi Li, Qing-Kuan Fan, Qi-Shun Wei, Hai-Cheng Qin, Zhan-Jie Zhang, Xiang-Ru Shan, Fa-Shou http://ir.isl.ac.cn:80/handle/363002/34509 2022-03-29T08:15:19Z 2022-03-29T08:15:19Z

题名: A late Eocene palynological record from the Nangqian Basin, Tibetan Plateau Implications for stratigraphy and paleoclimate 作者: Yuan, Qin; Vajda, Vivi; Li, Qing-Kuan; Fan, Qi-Shun; Wei, Hai-Cheng; Qin, Zhan-Jie; Zhang, Xiang-Ru; Shan, Fa-Shou 摘要: With the uplifting, large-scale thrusting and striking of the Tibetan Plateau, several Paleogene intracontinental basins formed within the northern Tibetan Plateau (TP). Stratigraphical and paleoenvironmental studies of the sedimentary successions within these basins are critical for understanding Paleogene climatological changes in Eurasia. The Nangqian Basin, one of such basins, formed in the Yushu area of the northeastern Tibetan Plateau. A set of lacustrine sediments, dominated by red clasolite, marlite, and gypsum, developed in the Yang Ala section in this basin. Paleontological records from the Nangqian Basin remain poorly known. Here, we investigate the palynological assemblages of one sedimentary succession at the Yang Ala section that belongs to the Gongjue Formation, and their implications regarding the geological age and paleoclimate are discussed. The results reveal that the assemblages are dominated mainly by angiosperm pollen (tricolpates and tricolporate), including Nitrariadites (Pokrovskaja), Quercoidites, and Labitricolpites, followed by gymnosperm pollen taxa, such as Ephedripites and Taxodiaceaepollenites, and sparse pteridophyte-spores produced by ferns. A late Eocene age is inferred based on palynostratigraphy and comparison with other pollen assemblages in the TP. A relatively dry climate with brief humid periods is indicated by the high abundance of xerophytic pollen taxa, such as Ephedripites and Nitrariadites, which are associated with broadleaved deciduous and evergreen plants. The characteristics of the pollen assemblages from the studied Yang Ala section are consistent with other Cenozoic palynofloras from the Mahalagou Formation in the Xining Basin and with those of the Yaxicuo Group in the Hoh Xil Basin. These results provide an improved stratigraphical scheme for parts of the Cenozoic and enrich the current knowledge of the vegetation history of the northeastern Tibetan Plateau. (C) 2016 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. All rights reserved.

2022-03-29T08:15:19Z Jin, Qiang Lu, Jian Wu, Jun Luo, Yongming http://ir.isl.ac.cn:80/handle/363002/34508 2022-03-29T08:15:18Z 2022-03-29T08:15:18Z

题名: Simultaneous removal of organic carbon and nitrogen pollutants in the Yangtze estuarine sediment The role of heterotrophic nitrifiers 作者: Jin, Qiang; Lu, Jian; Wu, Jun; Luo, Yongming 摘要: The Yangtze Estuary is one of the most eutrophic coastal areas in the world. The engagement of heterotrophic nitrification bacteria in the simultaneous removal of organic carbon and ammonium in the Yangtze estuarine sediment was investigated. The specific nitrification rate in the selective autotrophic nitrification inhibition treatment was about 25% of that in the control without autotrophic nitrification inhibition, suggesting that heterotrophic nitrification, in addition to autotrophic nitrification, was an important nitrification process in the sediment. The increase of heterotrophic nitrification can offset the decrease in autotrophic nitrification, which subsequently leads to the high tolerance of nitrification to the organic carbon. The number of heterotrophic nitrification bacteria was 7.1 x 10(7) MPN g(-1) in sediment collected from Site 1 while that of autotrophic nitrification bacteria was 4.2 x 10(8) MPN g(-1). The isolation of heterotrophic nitrification bacteria provides direct evidence of the engagement of heterotrophs in the nitrification of the Yangtze estuarine sediment. The results show that nitrification is catalyzed by both the autotrophs and the heterotrophs, indicating functional redundancy of nitrification in sediment. Since organic carbon usually coexists with ammonium, these findings indicate an alternative bioprocess for the simultaneous removal of organic carbon and ammonium in Yangtze estuarine sediment. (C) 2017 Elsevier Ltd. All rights reserved.

2022-03-29T08:15:18Z Lu, Jian Wu, Jun Zhang, Cui Zhang, Yuxuan Lin, Yichen Luo, Yongming http://ir.isl.ac.cn:80/handle/363002/34428 2022-03-29T07:16:13Z 2022-03-29T07:16:13Z

题名: Occurrence, distribution, and ecological-health risks of selected antibiotics in coastal waters along the coastline of China 作者: Lu, Jian; Wu, Jun; Zhang, Cui; Zhang, Yuxuan; Lin, Yichen; Luo, Yongming 摘要: Information on ecological and health risks posed by antibiotics in coastal waters at continental or national scale is limited although antibiotics have continuously entered the natural environments due to extensive usage for human beings and animals. This study collected coastal water samples along nearly 18,000 km of coastline of China to investigate the distribution, possible sources, and potential ecological-health risks of antibiotics. Only 7 out of 13 target antibiotics were detected in coastal water samples. Total concentrations of antibiotics ranged from 389 to 3302.3 ng/L. Norfloxacin (NFC), roxithromycin (RTM), and ciprofloxacin (CFC) were the most frequently detected antibiotics, with the maximal concentrations of 1990, 1230, and 109 ng/L, respectively. Antibiotics in coastal waters might be affected by three possible factors including veterinary-drug sources, anthropogenic sources, and mixed sources. Detected NFC and sulfamethoxazole (SMX) exerted high ecological risks in the short and long terms. CFC posed moderate short-term risks but insignificant long-term risks for aquatic organisms. RTM exerted low short-term risks while it posed moderate risks in the long term. Antibiotics exerted very low cancer risks and negligible non-cancer risks for both adults and children at all sampling sites. Health risks for children posed by antibiotics were generally higher than those for adults. Antibiotics in coastal waters of China still need effective control due to potential ecological-health risks they pose. (C) 2018 Elsevier B.V. All rights reserved.

2022-03-29T07:16:13Z ChongYi, E. Sun, YongJuan Liu, XiangJun Hou, Guangliang Lv, ShunChang Yuan, Jie Sun, Manping http://ir.isl.ac.cn:80/handle/363002/34427 2022-03-29T07:16:12Z 2022-03-29T07:16:12Z

题名: A comparative study of radiocarbon dating on terrestrial organisms and fish from Qinghai Lake in the northeastern Tibetan Plateau, China 作者: ChongYi, E.; Sun, YongJuan; Liu, XiangJun; Hou, Guangliang; Lv, ShunChang; Yuan, Jie; Sun, Manping 摘要: Qinghai Lake is the largest lake on the Tibetan Plateau (TP) and in China and has been a focus of paleoenvironmental and climatic research for decades. However, limited understanding of lake C-14 reservoir effects (LRE) has led to inconsistent interpretations among proxies of different sediment cores. As such, the onset of LRE variability during the Holocene is still unclear. C-14 dating of archeological samples from four locations (Gangcha, Shaliuheqiaoxi, and Shinaihai sites, and Niaodao section) including naked carp (Gymnocypris przewalskii, Kessler) fish bones, animal bones and teeth, and charcoal was employed to estimate variations in LRE over the last few thousand years. LRE offsets calculated as the difference between LRE of animal bones and fish bones are more reliable than that of charcoal and fish bones due to the 'old wood' effect in charcoal. LRE offsets recorded in fish bones were 0.5, 0.6, and 0.7 ka during the periods of 3.0-3.4 cal ka BP, 0.58-0.60 cal ka BP, and modern lake times, respectively, which may indicate a temporal minimum LRE offset. Unlike the wide spatial variations of LRE ages obtained from surface total organic carbon (TOC) samples of the modern Qinghai Lake, LRE offsets from the three contemporaneous locations in Qinghai Lake were all 0.5 ka, suggesting efficient carbon mixing occurred in naked carp. However, the late-Holocene (3.1 ka BP) LRE increased slightly with increasing salinity and decreasing lake level.

2022-03-29T07:16:12Z Wang, Jian-Hua Lu, Jian Zhang, Yu-Xuan Wu, Jun Zhang, Cui Yu, Xiaobin Zhang, Zhenhua Liu, Hao Wang, Wen-Hao http://ir.isl.ac.cn:80/handle/363002/34426 2022-03-29T07:16:12Z 2022-03-29T07:16:12Z

题名: High-throughput sequencing analysis of the microbial community in coastal intensive mariculture systems 作者: Wang, Jian-Hua; Lu, Jian; Zhang, Yu-Xuan; Wu, Jun; Zhang, Cui; Yu, Xiaobin; Zhang, Zhenhua; Liu, Hao; Wang, Wen-Hao 摘要: The conventional and recirculating mariculture systems are two typical intensive mariculture systems in the coastal zone. This study used high-throughput sequencing method to investigate the structural profiles of microbial communities in conventional and recirculating mariculture farms. The results showed that 13,842 OTUs (operational taxonomic units) were detected at a similarity level of 97%. Conventional and recirculating systems exhibited significant difference in microbialcommunity based on the results of the taxonomy and relative abundance of bacteria. Among the top 10 genera in coastal intensive mariculture systems, the predominant bacteria in the conventional intensive mariculture system were Pseudofulvibacter, Polaribacter, Glaciecola, Crocinitomix, Colwellia, Oleispira, and Balneola, while those in the recirculating systems were Vibrio, Alteromonas, and Pseudoalteromonas. Bacterial communities of different fish ponds suggested that the bacterial groups exhibited fish-specific or water treatment stage-specific features. Potential pathogens such as Vibrio, Arcobacter, Pseudoalteromonas, and Shewanella were readily accumulated as dominant bacteria in the recirculating mariculture system. The detection of similar potential pathogens in both the mariculture systems and the adjacent coastal water indicate that the mariculture farms without recirculating system could be the hotspots of pathogens and have great influences on the surrounding coastal environment. The wastewater treatment units used in recirculating farm could remove bacteria effectively, suggesting that the recirculating mariculture system may be more environmentally friendly than the conventional mariculture system.

2022-03-29T07:16:12Z An, FuYuan Liu, XiangJun Zhang, QiXing Wang, YiXuan Chen, TianYuan Yu, LuPeng Lu, BaoLiang Chang, QiuFang http://ir.isl.ac.cn:80/handle/363002/34425 2022-03-29T07:16:11Z 2022-03-29T07:16:11Z

题名: Drainage geomorphic evolution in response to paleoclimatic changes since 12.8 ka in the eastern Kunlun Mountains, NE Qinghai-Tibetan Plateau 作者: An, FuYuan; Liu, XiangJun; Zhang, QiXing; Wang, YiXuan; Chen, TianYuan; Yu, LuPeng; Lu, BaoLiang; Chang, QiuFang 摘要: Investigation of the geomorphologic evolution of drainage basins can provide insight into the response of mountain-basin systems to paleoclimate fluctuations. This study investigates the evolution of geomorphic units and their connectivity, from upstream piedmont to downstream salt lake, since the late Quaternary in the Golmud River catchment of the eastern Kunlun Mountains (KLM). The study aims to elucidate the debate over linkages between: (1) landform evolution and paleoclimatic change and (2) dynamic geomorphic processes and lake evolution in the lower basin. Based on geomorphic and sedimentological observations and an optically stimulated luminescence (OSL) chronology, we show three main phases of geomorphic processes: (1) upstream piedmont alluvial fans and an alluvial delta fan at the salt lake margin have surface sediment OSL ages of 12.8-11.4 ka, suggesting a valley aggradation stage in which mass periglacial detritus were eroded and redeposited in the drainage basin; (2) incision terraces in alluvial valley fills provide ages between 11.4 and 8.8, 8.1-6.2, and 4.9-3.9 ka. Incision is ascribed to the reduction in supply of detritus owing to glacial recession and enhanced precipitation in the early to middle Holocene; and (3) widely distributed swamp sediments in the distal delta fan date to 32-1.8 ka, suggesting a wetter stage within the late Holocene climatic deterioration. Loess, indicative of aridity, was deposited intermittently during the middle to late Holocene. We reconstructed a wetness index, based on wetness scores of drainage geomorphic units, which is consistent with published moisture proxies. This association implies that (1) landform processes in KLM responded well to precipitation fluctuations in Indian summer monsoon (ISM) dominant regions, indicating their climatic forcing and (2) precipitation variations in the eastern KLM have been mainly controlled by ISM intensity since 12.8 ka. Linking the geomorphologic evolution of mountain-basin systems to downstream arid basin evolution shows that the periods of fluvial terrace incision (early to middle Holocene) were probably important sources of lake salt mineral enrichment. The landscape evolution patterns of mountain-basin systems in the eastern KLM offer a model for assessing the linkages between geomorphic processes, paleoclimatic changes, and lake evolution in other arid regions. (C) 2018 Elsevier B.V. All rights reserved.

2022-03-29T07:16:11Z