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Long-term glacier variations and the response to climate fluctuation in Qilian Mountains,China

Journal of Geographical Sciences 2024年第10期34卷 1904-1924页

作者： WANG Sheng WANG Jianwen ZHU Meilin YAO Tandong PU Jianchen WANG Jinfeng College of Geography Science Shanxi Normal UniversityTaiyuan 030000China center for the pan-third pole environment Lanzhou UniversityLanzhou 730000China Key Laboratory of Tibetan environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchCASBeijing 100101China State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-environment and ResourcesCASLanzhou 730000China

Glaciers are considered to be‘climate-sensitive indicators'and‘solid reservoirs',and their changes significantly impact regional water *** mass balance(MB)from 2011 to 2020 of the Qiyi Glacier in the northeast Tibetan Plateau is presented based on field *** glacier showed a persistent negative balance over 9 years of in-situ observations,with a mean MB of-0.51 m ***^(-1).The distributed energy-mass balance model was used for glacier MB reconstruction from 1980 to *** daily meteorological data used in the model were from HAR v2 reanalysis data,with automatic weather stations located in the middle and upper parts of the glacier used for deviation *** average MB over the past 40 years of the Qiyi Glacier was -0.36 m ***^(-1)with the mass losses since the beginning of the 21st century,being greater than those in the *** glacier runoff shows a significant increasing trend,contributing~81% of the downstream river *** albedo disparity indicates that the net shortwave radiation is much higher in the ablation zone than in the accumulation zone,accelerating ablation-area expansion and glacier mass *** MB of the Qiyi Glacier is more sensitive to temperature and incoming shortwave radiation variation than *** MB presented a non-linear reaction to the temperature and incoming shortwave *** future climate warming,the Qiyi Glacier will be increasingly likely to deviate from the equilibrium state,thereby exacerbating regional water balance *** is found that the mass losses of eastern glaciers are higher than those of western glaciers,indicating significant spatial heterogeneity that may be attributable to the lower altitude and smaller area distribution of the eastern glaciers.

关键词： glacier mass balance energy-mass balance model hydrology Qilian Mountains

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Endophytic bacteria in the periglacial plant Potentilla fruticosa *** are influenced by habitat type

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Ecological Processes 2023年第1期12卷 791-805页

作者： Wangchen Sonam Yongqin Liu Liangdong Guo State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China center for the pan-third pole environment Lanzhou UniversityLanzhou 730000China State Key Laboratory of Mycology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Background Microbial communities in different plant compartments are relatively independent ***,the influence of environmental factors on the microbial community in different compartments of periglacial plants remains *** this study,we quantified the bacterial communities in the rhizosphere soil,as well as root and leaf endosphere compartments of a periglacial plant,Potentilla fruticosa ***,using high-throughput DNA ***,we evaluated the impacts of habitat types(glacier terminus zone,moraine ridge,and alpine meadow)on the bacterial community in different plant compartments of Potentilla fruticosa *** Our results showed that habitat type had a significant effect on the alpha diversity(Chao1 richness)of endophytic bacteria,but not on the rhizospheric *** community composition of rhizospheric and endophytic bacteria was significantly different across the three habitats,and habitat type had a greater effect on the endophytic bacteria than on rhizospheric *** contribution of rhizosphere soil to the root and leaf endophytes decreased with the transformation of habitats from glacier terminus zone to alpine *** contrast,host selection pressure sequentially increased from the glacier terminus zone to the moraine ridge to the alpine ***,we found that the bacterial co-occurrence network in the alpine meadow was more modular but had lower complexity and connectedness than that in the glacier terminus *** bacterial community was governed primarily by stochastic processes regardless of habitat *** This study reveals that the diversity and composition of endophytic bacteria associated with Potentilla fruticosa *** are more affected by habitat types than that of rhizospheric *** study also demonstrates that the assembly patterns and co-occurrence patterns of bacterial communities associated with Potentilla fruticosa *** vary by habitat type

关键词： Bacterial community Endophytic bacteria Periglacial plant Potentilla fruticosa var.albicans

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Human activity over natural inputs determines the bacterial community in an ice core from the Muztag ata glacier

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Science China Earth Sciences 2024年第5期67卷 1489-1499页

作者： Yongqin LIU Nianzhi JIAO Mukan JI Keshao LIU Baiqing XU Bixi GUO Tandong YAO State Key Laboratory of Tibetan Plateau Earth System Resources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China center for pan-third pole environment Lanzhou UniversityLanzhou 730013China University of Chinese Academy of Sciences Beijing 100101China State Key Laboratory for Marine environmental Science Xiamen UniversityXiamen 361102China

Ice core provides a valuable vertical timeline of past climates and anthropogenic *** proxies have been widely used in these studies,but there are few biological indicators *** address this gap,we investigated the bacterial community from a 74 m ice core of Muztag ata glacier on the Tibetan Plateau to link biological indicators with past climate and anthropogenic *** analyzing the portion of the ice core with environmental proxies available(corresponding to 1907 to 1991),we observed an increase in bacterial richness throughout the ice core,which was associated with higher NH_(4)^(+),an indicator of agricultural *** bacterial community was jointly determined by human activity,natural input,and air temperature,with a strong human influence after the ***,the relative abundance of animal gut-associated bacteria,including Aerococcaceae,Nocardiaceae,Muribaculaceae,and Lachnospiraceae,was associated with livestock number changes in the Central Asian *** with other bacterial lineages,they jointly explained 59.8%of the livestock number *** study provides quantitative evidence of the associations between bacterial indicators and past climate and human activities,highlighting the potential of using bacterial proxies for ice core studies.

关键词： Ice core of Muztag ata glacier Climate change and anthropogenic activity Biological indicator Gut-associated bacteria livestock number in the Central Asian region

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Microorganisms and Metabolically Biogeochemical Processes in Subglacial Ecosystems

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Journal of Earth Science 2024年

作者： Shuai Yuan Tao Wang Yongqin Liu center for pan-third pole environment， Lanzhou University Department of Ecology and environment of Gansu Province State Key Laboratory of Tibetan Plateau Earth System， environment and Resource (TPESER)， Institute of Tibetan Plateau Research， Chinese Academy of Sciences College of Resources and environment， University of Chinese Academy of Sciences

Subglacial ecosystems are important components in cryosphere， considering to be cold， dark， anoxic， oligotrophic habitats for cold-adapted microorganisms， which is important in global scale. The energy source for life survival is constrained in a subglacial environment. Thus， the metabolism processes， depending on chemical energy synthesis， are essential for the microbes， mainly chemolithoautotrophs， to survive in subglacial environments. The chemolithoautotrophs obtain energy from diverse minerals and dissolved ions stored in subglacial sediments and meltwater， which induce the chemical weathering of subglacial sediments and enhance the biogeochemical cycle. Unraveling the metabolism mechanisms of subglacial microbes helps to understand the biogeochemical processes and evaluate the influence on in situ and proglacial environments in global scale. Moreover， the study of subglacial microorganisms can guide the life exploration on ice-covered extraterrestial planets: Mars， Europa and Enceladus. This Review summarizes current knowledge of the environmental conditions， the microbial composition and the major biogeochemical cycle processes of subglacial environments. Furthermore， the review concludes the environment conditions on 3 ice-covered planets， which indicate the possibility of cold-adapted life existing on ice-covered extraterrestial planets.

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Glacial lakes under climate change: the imperative for comparative studies of microbial carbon metabolism in the Qinghai-Xizang Plateau and the Arctic

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Advances in Polar Science 2024年第3期35卷 324-326页

作者： LIU Keshao LIU Yongqin State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China center for the pan-third pole environment Lanzhou UniversityLanzhou 730000China

Glacial lakes,intimately linked to glacier termini,are crucial landscape features of the Qinghai-Xizang Plateau(QXP,Qinghai-Tibet Plateau)and the *** warming has accelerated glacier retreat and the rapid expansion of glacial lakes in both *** being typically considered harsh environments,these lakes serve as vital reservoirs for microbial biodiversity and carbon *** the face of climate change,glacial lake ecosystems over the QXP and the Arctic are undergoing *** highlights the significance of conducting research and establishing long-term monitoring programs focused on microbial carbon metabolism in these glacial lakes.

关键词： glacial lakes Qinghai-Xizang Plateau Arctic microbial carbon metabolism climate change glacier retreat

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Statistical models reveal the effects of atmospheric black carbon on glacial bacterial abundance on the Tibetan Plateau

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Journal of Earth Science 2024年

作者： Yongqin Liu Baiqing Xu Mukan Ji Zhongwei Huang Siyu Chen Jiming Li Guannan Mao Key Laboratory of Tibetan environment Changes and Land Surface Processes， Institute of Tibetan Plateau Research， Chinese Academy of Sciences center for the pan-third pole environment， Lanzhou University University of Chinese Academy of Sciences Key Laboratory for Semi-Arid Climate Change of the Ministry of Education， College of Atmospheric Sciences， Lanzhou University

Ice cores play an important role in the reconstruction of historical atmospheric information. The glacier of the Tibetan Plateau is influenced by the Indian monsoon and westerly winds， which divide the Tibetan Plateau into monsoon- and westly influenced regions. These atmospheric circulations bring distinct microbial communities to glaciers， with the microbial dispersal process being also influenced by atmospheric factors. However， the potential influence of between bacterial abundance and atmospheric factors is not well known. To reveal potential mechanisms controlling bacterial abundance between two regions， we obtained bacterial abundance and atmospheric records for the past 46 years from two ice cores located within these regions. Statistical regression models were constructed to fit the relationship between bacterial abundance and atmospheric factors. Generalized additive model (GAM) was superior in modeling bacterial abundance compared with linear models and showed that the key factors affecting bacterial abundance were different in the monsoon- and westerly-dominated regions. Specifically， atmospheric dust and black carbon were the key factors for the monsoon-dominated region， and westerly index was the key factor for the westerly-dominated region. The model outputs confirm that atmospheric black carbon plays an important role in affecting bacterial abundance for the glacier located within the monsoon-dominated region， particularly in recent decades. The model also predicted that bacterial abundance will increase by 27% with a doubled black carbon deposition. We quantify and model for the first time that relationship between bacterial abundance and atmospheric black carbon in Tibetan glaciers change over time based on GAM models.

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气候变暖加剧全球冰川失稳灾害过程

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Science Bulletin 2024年第1期69卷 30-33页

作者：张太刚王伟财申子恒安宝晟 State Key Laboratory of Tibetan Plateau Earth System Environment and ResourcesInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China College of Earth and environmental Sciences Lanzhou UniversityLanzhou 730000China center for the pan-third pole environment Lanzhou UniversityLanzhou 730000China School of Science Tibet UniversityLhasa 850011China

Glacier-related slope failures,including ice avalanches,ice-rock avalanches,glacier collapses,and rock avalanches on glaciers,are generally characterized by large collapse volumes,solid-liquid phase transition,and high mobility[1].They are one of the major types of geo-hazards in high mountain ***-related slope failures have cascading effects since they often evolve into glacial lake outburst floods(GLOFs),debris flows,and dammed lakes,which significantly prolong and amplify the impacts of the *** slope failures have cumulatively claimed more than tens of thousands of *** example,the 1962 and 1970 Huascaran events in the Peruvian Andes caused approximately 20,000 deaths[2],and the 2021 Chamoli ice-rock avalanche in the Indian Himalayas left more than 200 people dead or missing[3].

关键词： rock glacier floods

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Potential transformation of organic matter by microbes in cryoconite,Tibetan Plateau

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Science China Earth Sciences 2024年第6期67卷 1978-1989页

作者： Bixi GUO Yongqin LIU Kevin Xu ZHONG Quan SHI Chen HE Qiang ZHENG Ruanhong CAI State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China center for the pan-third pole environment Lanzhou UniversityLanzhou 730000China Department of Earth Oceanand Atmospheric SciencesUniversity of British ColumbiaVancouverBC V6T 1Z4Canada State Key Laboratory of Heavy Oil Processing Petroleum Molecules Engineering Center(PMEC)China University of PetroleumBeijing 102249China State Key Laboratory for Marine environmental Science Collage of Ocean and Earth SciencesXiamen UniversityXiamen 361102China Fujian Key Laboratory of Marine Carbon Sequestration Xiamen UniversityXiamen 361005China

Microorganisms play an essential role in the glacier carbon cycle;how they transform organic matter in mountain glacial cryoconite remains to be ***,we applied ultra-high resolution Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS)and deep sequencing of 16S rRNA gene,to investigate the temporal microbial transformation of dissolved organic matter(DOM)of the Tibetan Plateau *** the 60-day incubation,we found that DOM in cryoconite underwent a three-stage transformation,with decreasing bioavailability over *** microbial community did not change much in the first week while degrading DOM molecules that were associated with higher H/C_(wa)and lower O/C_(wa).During days 15-30,DOM composition remained stable while microbial diversity *** day 60,the DOM was microbially converted into a higher state of recalcitrance,with higher values of aromatic index,O/C_(wa),and lower H/C_(wa),which contained molecules containing more *** among various microbial taxa,like Cyanobacteria,Bacteroidota,Gammaproteobacteria,Firmicutes,and Actinobacteriota,drove the DOM transformation in *** study sheds light on the in-situ transformation of DOM composition meditated by microbial populations in cryoconite at a temporal scale,providing new insights into understanding the microbial roles in the glacier organic carbon transformation.

关键词： Cryoconite Dissolved organic matter Biodegradation Microbial community Temporal variation

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Influence of Interspecies interactions on bacterial community assembly in the active and permafrost layers on the Qinghai-Tibet Plateau

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Journal of Earth Science 2024年

作者： Hongfei Chi Xiufeng Yin Xuefeng Zhang Jingyi Zhu Lin Zhao Yongcui Deng Pengfei Liu Yongqin Liu College of Ecology， Lanzhou University center for the pan-third pole environment， Lanzhou University State Key Laboratory of Cryospheric Science， Northwest Institute of Eco-environment and Resources， Chinese Academy of Science State Key Laboratory of Tibetan Plateau Earth System， Resources and environment (TPESRE)， Institute of Tibetan Plateau Research， Chinese Academy of Sciences College of Resources and environment， University of Chinese Academy of Sciences School of Geographical Sciences， Nanjing University of Information Science and Technology School of Geography， Nanjing Normal University Jiangsu center for Collaborative Innovation in Geographical Information Resource Development and Application

Bacterial communities play a crucial role in permafrost biogeochemical cycling and ecosystem function maintenance. Bacterial interaction is one of the main factors in shaping soil bacterial communities. However， how would bacterial interaction influence the bacterial communities in permafrost of the Qinghai–Tibet Plateau (QTP) remains largely unknown. Here we collected paired soil samples from both the active and permafrost layers of two typical QTP permafrost regions in October 2020 for Tuotuohe River (TTH) and May 2022 for Aerjin (ARJ)， and investigated the bacterial communities and the role of interactions in structuring the bacterial community and its assembly process through amplicon sequencing of the 16S rRNA gene. Our study revealed distinct bacterial communities， with significant differences in the relative abundances of Proteobacteria (P<0.05)， Acidobacteriota (P<0.001)， Bacteroidota (P<0.05)， and Planctomycetota (P<0.001) between the active layer and the permafrost layer. More importantly， we found that interspecies interactions， including both positive and negative associations， were strongly correlated with bacterial alpha-diversity and played a significant role in community variation and assembly process. Our findings also showed that the community assembly in both the active and permafrost layers was primarily driven by homogeneous selection of deterministic processes， with interspecies interactions accounting for more than 58% and 63% of all assembly mechanisms， respectively. This is the first study to quantify the contribution of bacterial interactions in shaping the bacterial community and its assembly process in permafrost of QTP， highlighting the importance of considering interspecies interactions in future modeling efforts. Our work also emphasizes the necessity of including interspecies interactions in microbial process projections to reduce uncertainty.

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Removal of VOCs from Sudden Polluted Raw Water by Air Stripping

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Journal of Donghua University(English Edition) 2011年第5期28卷 456-459页

作者：林明利殷晓桃崔福义赵志伟姜琦 State Key Laboratory of Urban Water Resource and environment School of Municipal and Environmental EngineeringHarbin Institute of Technology pan-China Construction Group environmental Development center of Ministry environmental Protection

Volatile organic compounds （VOCs） are widely used in various industrial processes and generate water pollutions. VOCs removal from raw water is an important task for waterworks to guarantee drinking water security. The removal of VOCs such as chlorobenzene （CB） and ethylbenzene （EB） from raw water by air stripping was investigated under various conditions, inciuding the variation of temperature （5-30~C）, pH （3.5-10.5）, and air/water ratio （10-60）. The air stripping removal efficiency of VOCs decreased with VOCs concentration declining in water. And Henry＇s law constant was demonstrated as an indicator of the estimation of VOCs removal efficiency for air stripping. The effects of temperature and the ratio of air and water were found to play a great role in VOCs removal, but the effect of pH seemed to be negligible. This study demonstrates that air stripping provides a promising opportunity in removing VOCs in drinking water treatment, especially for the relatively high concentration of VOCs.

关键词： volatile organic compounds (VOCs) air stripping emergency water treatment Henry's law constant (H) removal

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