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背景草原生态系统是全球碳循环的重要组成部分,在土壤固碳、水源涵养和生物多样性维持中发挥着关键作用。然而,干旱半干旱草原对降雨波动和放牧干扰高度敏感。短时强降雨可迅速改变土壤水分,进而影响植物生长、微生物活动和生态系统碳交换;而放牧强度则通过调节植被结构和土壤保水能力,进一步改变这一响应过程。尽管已有研究关注了放牧或降雨对草地碳循环的影响,但二者如何协同调控土壤水分、植物群落及碳交换的短期动态机制,仍有待深入解析。针对这一研究空白,山东农业大学董智教授团队以内蒙古希拉穆仁典型荒漠草原为研究对象,结合不同放牧强度处理和2024年生长季5次典型降雨事件,系统观测土壤水分、植物群落与生态系统碳交换的短期响应。相关成果发表于 《Agriculture, Ecosystems and Environment》,为草地适度放牧管理提供了数据支撑。核心发现(1)放牧强度显著改变了土壤水分对降雨的响应,其中中度放牧增强表层土壤水分敏感性并维持水分稳定,而重度放牧削弱深层土壤水分响应和保水能力; 图1.土壤含水量和土壤温度对降雨刺激的响应。(a)、(b)和(c)分别代表 0–10 cm、10–20 cm 和 20–40 cm 土层中土壤含水量对降雨脉冲的响应。(d)代表 0–10 cm 土层温度对土壤含水量的响应。(e)代表降雨后不同放牧强度下土壤含水量的变化。(f)代表放牧强度对土壤含水量变异系数的影响。(2)降雨脉冲显著增强荒漠草原碳交换过程,而中度放牧有助于维持更稳定的碳吸收能力和碳汇功能;图2.NEE、ER和GEP受放牧强度和降雨过程的影响。(a)(b)(c)显示了不同放牧强度下NEE、ER和GEP对降雨脉冲的响应。(d)(e)(f)描述了不同放牧强度下NEE、ER和GEP对短期降雨事件及其后效应的响应。(g)展示了不同放牧强度下降雨事件期间NEE、ER和GEP的平均变化。(3)重度放...
发布时间: 2026 - 07 - 20
浏览次数:3
Measurement of extremely 2H-enriched water samples by laser spectrometry: application to batch electrolytic concentration of environmental tritium samples国际原子能机构(International Atomic Energy Agency -- IAEA)研究人员应用LGR水同位素分析仪测量高2H富集水样(备注:该文章是IAEA的研究人员独立发表的文章,具有权威性、客观性和独立性,亦可广泛使用。)IAEA的研究人员发表了一篇应用LGR水同位素分析仪(912-0032)测量高2H富集水样的文章,文章有2个目的:(1)论证基于OA-ICOS技术的水同位素分析仪可以快速获得高准确性和高精度的自然丰度水样和氘富集水样(delta_2H ~ +57,000‰)的δ2HVSMOW-SLAP   数值;(2)随后论证基于激光技术2H富集方法测量水样的效能,以促进进行批处理3H电解富集的环境氚水实验室的生产力。文章中还简要说明了应用CRDS分析仪测量高2H富集水样的情况(CRDS水同位素分析仪可测量数值约为750‰的δ2HVSMOW-SLAP样品,但两个样品之间需要大于20次以上的注射才可去除显著...
发布时间: 2016 - 01 - 18
浏览次数:279
UNSW researchers have used a new water-tracing technology in the Sydney Basin for the first time to determine how groundwater moves in the different layers of rock below the surface.新南威尔士大学(UNSW)研究人员在悉尼盆地首次应用新的水源示踪技术监测地表下不同岩层下的地下水运动 http://newsroom.unsw.edu.au/news/science-tech/new-water-tracing-technology-help-protect-sydney-basin-groundwater
发布时间: 2016 - 01 - 15
浏览次数:180
LGR的二氧化碳同位素分析仪帮助中国科学院的科学家监测“新鲜有机物的质量对土壤有机物的启动和微生物底物利用率模式的影响” Quality of fresh organic matter affects priming of soil organic matter and substrate utilization patterns of microbesHui Wang1, 2 , Thomas W. Boutton3 , Wenhua Xu1 , Guoqing Hu1, 2 , Ping Jiang1 , Edith Bai1 AbstractChanges in biogeochemical cycles and the climate system due to human activities are expected to change the quantity and quality of plant litter inputs to soils. How changing quality of fresh organic matter (FOM) might influence the priming effect (PE) o...
发布时间: 2015 - 10 - 16
浏览次数:261
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:281
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:260
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:192
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:226
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:236
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:220
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:205
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