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研究背景生物多样性如何影响入侵,是生态学的核心议题。经典理论认为物种丰富的群落更能抵御外来入侵,但这一认知几乎全部建立在生长季活体植物的研究之上,对植物衰老后凋落物产生的持续影响关注较少。凋落物分解既能释放氮、磷等养分,促进入侵植物生长,也可能携带真菌病原菌,对入侵植物形成生物抑制。这两种相反作用如何共同影响植物入侵,以及本地植物与入侵植物之间的系统发育亲缘关系是否会改变其作用方向,仍有待深入研究。基于此,兰州大学吴纪华老师团队研究以3种入侵菊科植物和12种本土植物凋落物为对象,通过设置不同凋落物多样性、亲缘关系及杀菌处理开展温室实验。结果表明,近缘凋落物主要通过病原菌溢出抑制入侵植物,远缘凋落物则通过养分富集促进其生长,为揭示植物亲缘关系调控多样性—可入侵性关系提供了数据支撑。成果发表于《New Phytologist》。图1.概念图展示了凋落物多样性与入侵性之间潜在机制的关系。研究方法研究对象:选取3种入侵菊科植物(豚草、黄顶菊、鬼针草)为测试物种,12种中国本土植物(6种菊科近亲、6种非菊科远亲)为凋落物供体;实验设计:设置3个凋落物多样性水平(1种、2种、6种)× 2个物种池(菊科 vs. 非菊科)× 2个病原菌处理(杀菌剂抑制 vs. 未抑制对照)× 3种入侵植物,共计360个实验盆;测定指标:培养104天后,测定入侵植物的地上生物量、病害程度、黄酮和总酚含量、土壤有效磷(AP)和铵态氮(NH₄-N);值得一提的是,团队采用SmartChem 450全自动间断化学分析仪测定土壤铵态氮(NH₄⁺-N),提高了批量样品的检测效率与数据稳定性,为分析凋落物养分富集效应提供了可靠支撑;数据分析:采用广义线性混合效应模型分析各处理及其交互作用,并通过Fisher’s Z值评估总体效应;图2.非度量多维尺度分析 (NMDS) 和置换多元方差分析 ...
发布时间: 2026 - 08 - 17
浏览次数:11
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:208
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:236
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:247
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:244
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:221
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:213
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:299
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:228
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,1 Jeffrey McDonnell1,2 and Chris Soulsby11 Northern Rivers Institute, School of Geosciences, University of Aberdeen, Scotland, UK2 Global Institute for Water Security, National Hydrology Research Centre, University of Saskatchewan, Saskatoon, Canada Abstract:Soil water storage and stable isotopes dynamics were investigated in dominant soil–vegetation assemblages of a wet nor...
发布时间: 2015 - 02 - 26
浏览次数:191
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) bioreduction in 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. Banfieldg a Lawrence Berkeley National Laboratory, Ber...
发布时间: 2015 - 02 - 04
浏览次数:220
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