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Why lowland riparian trees are difficult to use for streamflow reconstruction

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Journal of Forestry Research 2024年第3期35卷 219-230页

作者： Xiaomei Peng Shengchun Xiao bao yang Quanyan Tian Vladimir V.Shishov Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000People's Republic of China School of Geography and Ocean Science Nanjing UniversityNanjing 210023People's Republic of China Institute of Fundamental Biology and Biotechnology Siberian Federal UniversityKrasnoyarskRussia 660041

Existing streamflow reconstructions based on tree-ring analysis mostly rely on species from upland,mainly montane areas,while lowland species(generally plain)areas are rarely *** limits the understanding of streamflow change history in the lowlands,which is an important basis for water resource *** study focused on Populus euphratica stands located along the main stream,eastern and western tributaries in the lower reaches of the Heihe River basin(HRb),in arid northwestern *** investigated how streamflow regulation interferes with ripar-ian trees in lowlands when they used for streamflow ***-ring width chronologies were developed and analyzed in conjunction with meteorological and hydrologic observation *** results show streamflow regulation leads in sharp fluctuations in the streamflow allocation between the eastern tributaries and western *** resulted in instability of the correlation between streamflow at the two tributaries and at the Zhengyixia hydrologic station,with corresponding fluctuations in radial growth of poplar trees on the banks of the two tributaries and at the *** regulation altered the natural patterns of seasonal streamflow below the station,changing the time window of poplar *** study provides useful insight into tree-ring width based streamflow reconstruction in the lowlands.

关键词： Tree-ring width-Dendrochronology Populus euphratica The Ejina Oasis Streamflow

The influence of proxy selection on global annual mean temperature reconstructions during the Common Era

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Science China Earth Sciences 2024年第8期67卷 2522-2534页

作者： bao yang Xia LI Minhui HE Feng WANG Yesi ZHAO Peng ZHANG Jianglin WANG Frontiers Science Center for Critical Earth Material Cycling School of Geography and Ocean ScienceNanjing UniversityNanjing 210023China Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Centre Eau Terre Environnement Institut National de la Recherche ScientifiqueQuébecQCG1K 9A9Canada GEOTOP Research Centre in the Dynamics of the Earth System MontréalQC H2X 3Y7Canada

The reconstruction of global annual mean temperatures made by the PAGES 2k Consortium in 2019 represents one of the most influential sequences of global climate variability over the Common ***,it is still not clear how the reconstruction can be influenced by the selection of reconstruction methods and the selection of proxy records with different temporal resolutions over different *** adopt a widely used Composite-Plus-Scale method to elucidate the effects of the selection of the proxy records on temperature *** ensure the uniformity of data,different types of proxy records spanning the past~2000 years from the PAGES 2k proxy network were used to investigate the potential effects of proxy selection in hemispheric and global temperature reconstructions during the past two *** long-term trends,spectral characteristics,and volcanic responses of the annual temperatures were studied based on the *** results reveal a significant cooling trend in the global annual mean temperature using both tree-ring and non-tree-ring records during the 1–1850CE period,and show that the cooling exhibits a stronger trend in the Southern Hemisphere(SH)than that in the Northern Hemisphere(NH).Yet,the long-term trends vary according to different combinations of proxy *** reconstructions based on different types of proxies also exhibit different features in terms of volcanic responses and spectral ***-ring-based temperature reconstructions show stronger cooling responses to tropical volcanic eruptions,while non-tree-ring-based reconstructions suggest less robust volcanic responses,which may be related to dating uncertainties and low temporal resolution of the ***-ring width records tend to preserve a substantial proportion of high-frequency(200 years)*** are needed to reduce uncertainti

关键词： Millennial cooling trend Global climate change Proxy records Volcanic eruptions Spectral properties Common Era

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Structure,bioavailability and physicochemical properties of icariin-soymilk nanoparticle

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Food Science and Human Wellness 2024年第2期13卷 972-981页

作者： Jinping Wang Lingrong Wen Yueming Jiang Hong Zhu Weizheng Sun Guangyi Dai bao yang Guangdong Provincial Key Laboratory of Applied Botany Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic ImprovementSouth China Botanical GardenChinese Academy of SciencesGuangzhou 510650China South China National Botanical Garden Guangzhou 510650China College of Food Science and Engineering Jilin Agricultural UniversityChangchun 130118China University of Chinese Academy of Sciences Beijing 100049China School of Food Sciences and Engineering South China University of TechnologyGuangzhou 510640China

Soymilk is a natural ***,the performance of flavonoid-soymilk nano-complex remains *** this work,icariin-soymilk nano-complexes(ISNCs)were successfully fabricated and *** effects of high-pressure homogenization(HPH)treatment on structure and physicochemical properties of soymilk and nano-complexes were *** treatment could significantly improve the surface hydrophobicity and interfacial activity of *** soymilk with HPH treatment could significantly improve the water solubility(20 folds),thermal stability and bioavailability of *** highest encapsulation efficiency(93.28%),loading capacity(39.09μg/mg),ζ-potentia(absolute value,31.20 mV)and bioavailability(72.14%)were observed in HSI-200(200 bar of homogenization pressure).While HSI-500(500 bar of homogenization pressure)showed the smallest particle size(183.73 nm).ISNCs showed a rougher surface and an irregular lamellar structure with large amount of fine particles by using Cryo-SEM,suggesting that icariin was encapsulated in *** data supplied a novel strategy to improve the performance of icariin in functional foods.

关键词： Encapsulation efficiency Flavonoid High pressure homogenization Loading capacity Nano-complex

A comparison study on structure-function relationship of polysaccharides obtained from sea buckthorn berries using different methods:antioxidant and bile acid-binding capacity

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Food Science and Human Wellness 2024年第1期13卷 494-505页

作者： Qiaoyun Li Zuman Dou Qingfei Duan Chun Chen Ruihai Liu Yueming Jiang bao yang Xiong Fu SCUT-Zhuhai Institute of Modern Industrial Innovation School of Food Science and EngineeringSouth China University of Technology381 Wushan RoadGuangzhou 510640China Guangzhou Institute of Modern Industrial Technology Nansha 511458China Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety Guangzhou 510640China Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health(111 Center) Guangzhou 510640China Department of Food Science Stocking HallCornell UniversityIthaca 14853USA South China Botanical Garden Chinese Academy of SciencesGuangzhou 510650China

In this study,the structural characters,antioxidant activities and bile acid-binding ability of sea buckthorn polysaccharides(HRPs)obtained by the commonly used hot water(HRP-W),pressurized hot water(HRP-H),ultrasonic(HRP-U),acid(HRP-C)and alkali(HRP-A)assisted extraction methods were *** results demonstrated that extraction methods had significant effects on extraction yield,monosaccharide composition,molecular weight,particle size,triple-helical structure,and surface morphology of HRPs except for the major linkage *** analysis showed that HRP-U with filamentous reticular microstructure exhibited better thermal *** HRP-A with the lowest molecular weight and highest arabinose content possessed the best antioxidant ***,the rheological analysis indicated that HRPs with higher galacturonic acid content and molecular weight showed higher viscosity and stronger crosslinking network(HRP-C,HRP-W and HRP-U),which exhibited stronger bile acid binding *** present findings provide scientific evidence in the preparation technology of sea buckthorn polysaccharides with good antioxidant and bile acid binding capacity which are related to the structure affected by the extraction methods.

关键词： Sea buckthorn Extraction method Structure Rheological properties Antioxidant activity Bile acid binding capacity

Wood anatomy chronologies of Scots pine in the foothills of the Western Sayan(Siberia)

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Journal of Forestry Research 2024年第3期35卷 13-27页

作者： Elena A.Babushkina Dmitry R.Dergunov Mikhail S.Zharkov Liliana V.Belokopytova Dina F.Zhirnova bao yang Jingjing Liu Xiaomei Peng Eugene A.Vaganov Khakass Technical Institute Siberian Federal UniversityAbakan 655017Russia Institute of Ecology and Geography Siberian Federal UniversityKrasnoyarsk 660036Russia Mathematical Methods and IT Department Siberian Federal UniversityKrasnoyarsk 660036Russia Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000People's Republic of China School of Geographic and Oceanographic Sciences Nanjing UniversityNanjing 210093People's Republic of China Department of Dendroecology V.N.Sukachev Institute of ForestSiberian Branch of the Russian Academy of ScienceKrasnoyarsk 660036Russia

Recent methodological advances in quantitative wood anatomy have provided new insights into the climatic responses of radial growth at the scale of cell structure of tree rings. This study considered long-term chronologies of tracheid measurements, indexed by a novel approach to separate their specific climatic responses from signal recorded in cell production(closely reflected in tree-ring width). To fill gaps in understanding the impact of climate on conifer xylem structure, Scots pine(Pinus sylvestris L.)trees > 200 years old were selected within the forest-steppe zone in southern Siberia. Such habitats undergo mild moisture deficits and the resulting climatic regulation of growth processes. Mean and maximum values of cell radial diameter and cell wall thickness were recorded for each tree *** a low level of climatogenic stress, components of cell chronologies independent of cambial activity were separated to obtain significant climatic signals revealing the timing of the specific stages of tracheid differentiation. Cell expansion lasted from mid-April to July and was impacted similarly to tree-ring width(stimulated by precipitation and stressed by heat), maximum cell size formed late June. A switch in the climatic responses of mean anatomical traits indicated transition to latewood in mid-July. Secondary wall deposition lasted until mid-September, suppressed by end of season temperatures. Generally, anatomical climatic responses were modulated by a less dry May and September compared with summer months.

关键词： Quantitative wood anatomy Cell radial size Cell wall thickness Pinus sylvestris Climatic response

Licorice-saponin A3 is a broad-spectrum inhibitor for COVID-19 by targeting viral spike and anti-inflammation

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Journal of Pharmaceutical Analysis 2024年第1期14卷 115-127页

作者： yang Yi Wenzhe Li Kefang Liu Heng Xue Rong Yu Meng Zhang yang-Oujie bao Xinyuan Lai Jingjing Fan Yuxi Huang Jing Wang Xiaomeng Shi Junhua Li Hongping Wei Kuanhui Xiang Linjie Li Rong Zhang Xin Zhao Xue Qiao Hang yang Min Ye State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing100191China Yunnan Baiyao International Medical Research Center Peking UniversityBeijing100191China CAS Key Laboratory of Pathogen Microbiology and Immunology Institute of MicrobiologyChinese Academy of SciencesBeijing100101China CAS Key Laboratory of Special Pathogens and Biosafety Center for Biosafety Mega-ScienceWuhan Institute of VirologyChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Department of Microbiology and Infectious Disease Center School of Basic Medical SciencesPeking University Health Science CenterPeking UniversityBeijing100191China Hubei Jiangxia Laboratory Wuhan430000China Shenzhen Children's Hospital ShenzhenGuangdong518036China

Currently,human health due to corona virus disease 2019(COVID-19)pandemic has been seriously *** coronavirus severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)spike(S)protein plays a crucial role in virus transmission and several S-based therapeutic approaches have been approved for the treatment of ***,the efficacy is compromised by the SARS-CoV-2 evolvement and *** we report the SARS-CoV-2 S protein receptor-binding domain(RBD)inhibitor licorice-saponin A3(A3)could widely inhibit RBD of SARS-CoV-2 variants,including Beta,Delta,and Omicron BA.1,XBB and ***,A3 could potently inhibit SARS-CoV-2 Omicron virus in Vero E6 cells,with EC50 of 1.016μ*** mechanism was related to binding with Y453 of RBD determined by hydrogen-deuterium exchange mass spectrometry(HDX-MS)analysis combined with quantum mechanics/molecular mechanics(QM/MM)***,phosphoproteomics analysis and multi fluorescent immunohistochemistry(mIHC)respectively indicated that A3 also inhibits host inflammation by directly modulating the JNK and p38 mitogen-activated protein kinase(MAPK)pathways and rebalancing the corresponding immune *** work supports A3 as a promising broad-spectrum small molecule drug candidate for COVID-19.

关键词： COVID-19 Inflammation Licorice-saponin A3 Receptor-binding domain(RBD) SARS-CoV-2

Atomistic understanding of capacity loss in LiNiO_(2)for high-nickel Li-ion batteries:First-principles study

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Chinese Physics B 2024年第5期33卷 625-629页

作者：彭率陈丽娟何长春杨小宝 School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510000China Center of Excellence for Advanced Materials Dongguan 523808China

Combining the first-principles calculations and structural enumeration with recognition,the delithiation process of LiNiO_(2)is investigated,where various supercell shapes are considered in order to obtain the formation energy of Li_(x)NiO_(2).Meanwhile,the voltage profile is simulated and the ordered phases of lithium vacancies corresponding to concentrations of 1/4,2/5,3/7,1/2,2/3,3/4,5/6,and 6/7 are *** understand the capacity decay in the experiment during the charge/discharge cycles,deoxygenation and Li/Ni antisite defects are calculated,revealing that the chains of oxygen vacancies will be energetically *** can be inferred that in the absence of oxygen atom in high delithiate state,the diffusion of Ni atoms is facilitated and the formation of Li/Ni antisite is induced.

关键词： Li-ion battery ground state formation energy oxygen vacancy Li/Ni antisite

祁连山及周边地区气温与降水的动力降尺度模拟

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中国沙漠 2024年第1期44卷 61-74页

作者：李霞杨保中国科学院西北生态环境资源研究院、沙漠与沙漠化重点实验室甘肃兰州730000 中国科学院大学北京100049

祁连山及其周边地区是季风-西风交互作用的敏感区,气候变化机制复杂。在研究区域进行了为期一年的参数化方案组合敏感性试验,从5组方案组合中选出模拟效果最佳的参数化方案组合,利用偏差校正过的CMIP6数据驱动最佳参数化方案组合设置下... 详细信息

祁连山及其周边地区是季风-西风交互作用的敏感区,气候变化机制复杂。在研究区域进行了为期一年的参数化方案组合敏感性试验,从5组方案组合中选出模拟效果最佳的参数化方案组合,利用偏差校正过的CMIP6数据驱动最佳参数化方案组合设置下的区域气候模式WRF,对祁连山及周边地区开展了2005—2014年间为期10 a的动力降尺度模拟。结果显示:(1)WRF模式对气温的模拟普遍较好,不同的参数化方案组合对气温的模拟影响不大。WRF模式对降水的模拟受参数化方案组合影响较大,模拟精度整体较气温差。参数化方案组合的敏感性试验结果显示:Thompson云微物理方案、Grell-D积云对流方案、RRTM-Dudhia辐射物理方案和Noah陆面过程方案的参数化方案组合最适用于祁连山及周边地区。地形资料敏感性试验结果显示高分辨率地形数据集对气温与降水的模拟未见明显改善。(2)模拟气温与降水的空间分布特征基本能够再现真实观测数据的空间分布特征。气温与降水的空间分布受海拔影响很大,在高海拔地区气温比周围低海拔地区偏低,降水量则是偏高,模拟气温与观测气温之间的相关性好于对降水的模拟。模拟偏差主要表现在对气温的模拟普遍存在低估,对降水量的模拟存在高估。在站点尺度上,模拟温度和降水与观测温度和降水都有着几乎一致的正态分布,各站点上的温度模拟偏差主要出现在冬季,降水模拟偏差则出现在夏季。

关键词： WRF 祁连山参数化方案评估动力降尺度

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树轮稳定碳同位素研究进展

第四纪研究 2024年第4期44卷 1044-1061页

作者：廖昌蕊杨保南京大学地理与海洋科学学院江苏南京210023

近年来,树轮稳定碳(C)同位素的实验、分析方法渐趋成熟,被广泛应用于树轮气候学、树木生理学和森林生态学等领域。本文基于文献统计的方法回顾了树轮稳定C同位素的发展历程,并对未来研究动向进行展望。结果发现:1)基于树轮稳定C同位素... 详细信息

近年来,树轮稳定碳(C)同位素的实验、分析方法渐趋成熟,被广泛应用于树轮气候学、树木生理学和森林生态学等领域。本文基于文献统计的方法回顾了树轮稳定C同位素的发展历程,并对未来研究动向进行展望。结果发现:1)基于树轮稳定C同位素的研究主要分布在北半球中纬度地区,多集中于气候学和生理学领域,生态学方面的研究较少;2)树轮稳定C同位素能够重建过去百年至千年的温度、降水、相对湿度、云量等气候要素的变化;3)树轮稳定C同位素能够指示树木内在水分利用效率,用于研究树木应对气候或环境事件(如干旱、大气污染等)的生理响应;4)树轮稳定C同位素数据还能够提高动态植被模型、树木生长过程模型模拟的精度,进而反演及预测气候和环境变化。综上,树轮稳定C同位素从用于重建气候因子变化,发展为探究树木响应气候环境的生理过程,并通过嵌入动态植被模型和地球系统模型进行模拟和预测。未来仍需加强对光合作用后稳定C同位素分馏机制的研究,挖掘树轮稳定C同位素在重建古气候的潜力,并结合树木生长过程模型、动态植被模型等模拟并预测气候和环境变化。

关键词：综述树轮气候学树木生理学生态学