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研究背景在全球变化与人类活动共同作用下,地下水系统正面临越来越显著的压力。尤其在半干旱地区,降水时空分布不均、生态修复改变下垫面结构以及深厚包气带对水分下渗的阻滞,使得“地下水何时得到补给、以何种方式得到补给、补给量究竟有多大”成为关键科学问题。黄土高原丘陵沟壑区是我国典型的生态脆弱区,退耕还林和沟道土地整治等生态修复工程显著重塑了坡面—沟道水文过程,但其对地下水补给的影响仍缺乏长期、直接的实测证据。基于此,中国科学院地球环境研究所王云强老师团队以陕西省延安市顾屯流域为研究对象,开展了为期七年的连续野外观测实验,相关研究成果发表于《Ecological Engineering》。研究系统监测了降水、土壤水分、地下水水位及多水体稳定同位素等指标。其结果揭示了事件尺度与年尺度降水极值通过优先流路径和地下水位上升显著强化了生态修复集水区的地下水补给过程,为理解黄土高原厚层非饱和带中降水—土壤水—地下水之间的快速水力连通性提供了关键数据支撑,并对生态修复工程背景下的地下水可持续管理具有重要科学指导意义。 图1. 研究区域和采样点的位置。研究方法研究团队依托陕西黄土高原地球关键带国家野外科学观测研究站,在延安固屯流域开展了长达7年(2017–2023 年)的连续野外监测;监测体系:涵盖了气象站、表面水、土壤水及地下水水位监测;值得一提的是,研究团队采用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)提取样品中的土壤水,该设备采用超低压真空蒸馏冷冻的原理,不仅能高效(98%)获取土壤水,而且可严格控制提取过程、避免蒸发引发的同位素分馏,确保氢氧同位素分析结果的准确性; 图2.阳坡和阴坡4000 cm土壤剖面含水量的垂直分布。 图3.2021年7月至2022年3月4000 cm土壤剖面土壤水分月动态。 图4.降水事件期间地下水位的时间序列 (a),以及地下水位变化与各类因...
发布时间: 2026 - 05 - 11
浏览次数:3
Rapid, Online Quantification of H2S in JP-8 Fuel Reformate Using Near-Infrared Cavity-Enhanced Laser Absorption Spectroscopy应用LGR激光痕量气体分析仪快速在线量化JP-8(特级航空材料)中的H2SFeng Dong†, Christian Junaedi‡, Subir Roychoudhury‡, and Manish Gupta*†† Los Gatos Research, 67 East Evelyn Avenue, Suite 3, Mountain View, California 94041, United States‡ Precision Combustion, Inc., 410 Sackett Point Road, North Haven, Connecticut 06473, United StatesAnal. Chem., 2011, 83 (11), pp 4132–4136DOI: 10.1021/ac200300tPublication Date (Web): May 3, 2011Copyright © 2011 American Chemical SocietyAbstractOn...
发布时间: 2015 - 10 - 10
浏览次数:232
Ecosystem carbon (CO2 and CH4) fluxes of a Populus dettoides plantationin subtropical China during and post clear-cutting Shenghua Gao a, Jiquan Chen b, Yuxi Tang c, Jing Xie d, Rui Zhang e, Jie Tang c, Xudong Zhang a,*a State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, Chinab Center for Global Change and Earth Observations (CGCEO) and Department of Geography, Michigan State University, East Lansing, MI 48823, USAc Hunan Academy of Forestry, Chang...
发布时间: 2015 - 09 - 15
浏览次数:189
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:142
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 F1 and 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 i...
发布时间: 2015 - 08 - 06
浏览次数:177
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:195
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:156
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:153
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:155
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 oth...
发布时间: 2015 - 05 - 12
浏览次数:242
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:167
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