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研究背景地下水是高寒地区水循环的重要组成部分,其补给过程受到冻融循环的显著调控。随着气候变暖,青藏高原冻土退化、活动层加深,土壤水分的储存与迁移条件发生变化,进而影响降水、融雪水、土壤水与地下水之间的水文联系。然而,不同冻融阶段地下水补给来源的变化及其迁移路径仍缺乏系统认识。针对这一问题,北京师范大学李小雁老师团队以青海湖流域为研究区,结合氢氧稳定同位素示踪与MixSIAR贝叶斯混合模型,定量解析不同冻融阶段地下水的补给来源,揭示冻融过程对土壤水文连通性及地下水补给路径的影响。图1.(a) QLB在青藏高原(QTP)上的位置。(b) QLB内多年冻土的时空分布;其中灰色代表季节性冻土,橙色代表多年冻土。(c) QLB的位置及采样点分布。(d) 地下水采样。(e) 降水采样。(f) 在相邻地点每月采集土壤样品。研究方法研究设计:研究区位于青藏高原东北部青海湖流域。2025年5—10月,研究团队在流域内布设15个地下水采样点、17个土壤采样点和11个降水采样点,共采集481份样品,包括地下水90份、土壤306份和降水85份。土壤样品分别采集自0–30 cm、30–60 cm和60–90 cm土层;根据空气温度和土壤温度,将研究期划分为三个阶段:5—6月为融化期,7—9月为完全融化期,10月为冻结期;样品采集:团队在青海湖流域开展月度野外采样,共采集降水、地下水及不同深度土壤样品481份,并测定各类水样的δ²H和δ¹⁸O。其中,土壤水采用LI-2100全自动真空冷凝抽提系统(北京理加联合科技有限公司)进行提取。该系统基于低压真空蒸馏与冷冻原理,实现土壤水分提取,并通过控制提取过程降低蒸发及同位素分馏对分析结果的影响,为后续氢氧稳定同位素分析提供样品。此外,采用105 ℃烘干法测定土壤含水量(SWC),分析不同深度土层的水分变化特征;统计分析:采用单因素方差分析...
发布时间: 2026 - 11 - 09
浏览次数:24
HYPERSPECTRAL REMOTE SENSING FOR DETECTION OF RHIZOCTONIA CROWN AND ROOT ROT IN SUGARBEETGregory J. Reynolds1, Carol E. Windels2, Ian V. MacRae3, and Soizik Laguette4Graduate Student, Professor, Associate Professor, and Assistant Professor, respectively1University of Minnesota, Department of Plant Pathology, St. Paul2University of Minnesota, Department of Plant Pathology and Northwest Research & Outreach Center, Crookston3University of Minnesota, Department of Entomology and Northwest Research & Outreach Center, Crookston4University of North Dakota, Department of Earth System Science a...
发布时间: 2015 - 08 - 11
浏览次数:264
DETECTION OF SUGARCANE AFRICAN STALK BORER ELDANASACCHARINA WALKER (LEPIDOPTERA: PYRALIDAE) USINGHYPERSPECTRAL REMOTE SENSING (SPECTRORADIOMETRY)应用ASD地物光谱仪检测蛀虫ELDANA SACCHARINA(鳞翅目:螟蛾科)对非洲甘蔗茎部的危害程度MOKHELE TA1, AHMED F1and CONLONG DE2,31School of Environmental Sciences, University of KwaZulu-Natal, Durban, 4041, South Africa2South African Sugarcane Research Institute, Private Bag X02, Mount Edgecombe 4300, South Africa3School of Biological and Conservation Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, 3209, South AfricaAbstractThe South African sugar industry is one ...
发布时间: 2015 - 08 - 06
浏览次数:284
LGR氧化亚氮同位素分析仪测量水中硝酸盐成功案例:Analytical Chemistry 文章:Combining Denitrifying Bacteria and Laser Spectroscopy for Isotopic Analyses (δ15N, δ18O) of Dissolved Nitrate通过反硝化细菌和激光同位素分析仪测定溶解硝酸盐中的δ15N和δ18ODavid X. Soto *†, Geoff Koehler †, and Keith A. Hobson †† Environment Canada, 11 Innovation Boulevard, Saskatoon, Saskatchewan, Canada, S7N 3H5AbstractWe present a novel approach for nitrogen (δ15N) and oxygen (δ18O) isotopic analysis of nitrate in water based on the isotopic analysis of N2O produced from the conversion of NO3– by cultured denitrifying bacteria and off-axis integrated cavity output ...
发布时间: 2015 - 07 - 21
浏览次数:304
Nature 发表文章:In-situ unsaturated zone stable water isotope (2H and 18O) measurements in semi-arid environments using tunable o-axis integrated cavity output spectroscopy科学家应用LGR液态水同位素分析仪在半干旱环境下原位测量不饱和带水中2H和18O同位素比值M. Gaj1,2,  M. Beyer1,  P. Koeniger1,  H. Wanke3,  J. Hamutoko3,  and T. Himmelsbach11 Federal Institue for Geosciences and Natural Resources (BGR), Stilleweg 2, Hannover, Germany2 Chair of Hydrology, Faculty of Environment and Natural Resources, University of Freiburg, Fahnenbergplatz, 79098 Freiburg, Germany3Universit...
发布时间: 2015 - 07 - 07
浏览次数:335
Inter- and intraindividual correlations of background abundances of 2H, 18O and 17O in human urine and implications for DLW measurements科学家应用LGR同位素分析仪测定人体尿液中的2H,18O和17O丰度间的相互作用对DLW测量方法的影响E S F Berman, E L Melanson, T Swibas, S P Snaith and J R SpeakmanBackground/Objectives:The method of choice for measuring total energy expenditure in free-living individuals is the doubly labeled water (DLW) method. This experiment examined the behavior of natural background isotope abundance fluctuations within and between individuals over time to assess possible methods of accounting for varia...
发布时间: 2015 - 07 - 01
浏览次数:269
科学家应用Campbell CPEC200闭路涡动相关系统测量森林碳封存Canada: Forest Carbon SequestrationCampbell Scientific CPEC200 monitors eddy-covariance fluxes in British Columbia forest文章下载地址:79canada-vancouver-island--CPEC200.pdf4da92e4cbee3e5c7273825cef11d6136.pdf(2.84 MB)
发布时间: 2015 - 05 - 19
浏览次数:267
Field Spectroscopy in the VNIR-SWIR Region to Discriminate between Mediterranean Native Plants and Exotic-Invasive Shrubs Based on Leaf Tannin Content基于可见光近红外(VNIR)和短波红外(SWIR),科学家应用ASD地物光谱仪测量叶片单宁的含量,从而区分地中海附近海岸的本土植物和外来入侵灌木。Authors:Jan Rudolf Karl Lehmann, André Große-Stoltenberg, Meike Römer and Jens OldelandAbstract:The invasive shrub, Acacia longifolia, native to southeastern Australia, has a negative impact on vegetation and ecosystem functioning in Portuguese dune ecosystems. In order to spectrally discriminate A. longifoliafrom other non-native and native species,...
发布时间: 2015 - 05 - 12
浏览次数:344
科学家应用LGR氨气分析仪快速原位机载测量空气中氨气的含量Fast in situ Airborne Measurement of AmmoniaUsing a Mid-Infrared Off-Axis ICOS Spectrometer科学家应用LGR氨气分析仪快速原位机载测量空气中氨气的含量,这可以帮助我们更好的分析大气的成分和气溶胶的组成,具有深远的意义。J. Brian Leen,†,* Xiao-Ying Yu,‡,* Manish Gupta,† Douglas S. Baer,† John M. Hubbe,‡ Celine D.Kluzek, ‡ Jason M. Tomlinson,‡ and Mike R. Hubbell II‡†Los Gatos Research Inc., 67 E. Evelyn Ave, Suite 3, Mountain View, CA 94041‡Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA 99352ABSTRACT:A new ammonia (NH3) analyzer was developed based on off-axis integrated cavity output spectroscopy...
发布时间: 2015 - 03 - 17
浏览次数:275
The relative role of soil type and tree cover on water storageand transmission in northern headwater catchments科学家应用LGR液态水同位素分析仪在北部水源集中区域监测土壤类型与植被覆盖类型对水的存储和传输的影响Josie Geris,1*Doerthe Tetzlaff,1Jeffrey McDonnell1,2and Chris Soulsby11Northern Rivers Institute, School of Geosciences, University of Aberdeen, Scotland, UK2Global Institute for Water Security, National Hydrology Research Centre, University of Saskatchewan, Saskatoon, CanadaAbstract:Soil water storage and stable isotopes dynamics were investigated in dominant soil–vegetation assemblages of a wet northern headwater catchment (3.2 ...
发布时间: 2015 - 02 - 26
浏览次数:246
科学家应用LGR液态水同位素分析仪做同位素示踪研究,研究证明,重碳酸盐的修正可以提高被铀污染的含水层的生物还原修复能力。Bicarbonate impact on U(VI) bioreductionin a shallow alluvial aquiferPhilip E. Longa, Kenneth H. Williamsa, James A. Davisa, Patricia M. Foxa, Michael J. Wilkinsb,1,Steven B. Yabusakib, Yilin Fangb, Scott R. Waichlerb, Elena S.F. Bermanc, Manish Guptac, Darrell P. Chandlerd, Chris Murrayb, Aaron D. Peacocke, Ludovic Giloteauxf, Kim M. Handleyg,2, Derek R. Lovleyh,Jillian F. BanfieldgaLawrence Berkeley National Laboratory, Berkeley, CA 94720, USAbPacific Northwe...
发布时间: 2015 - 02 - 04
浏览次数:285
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