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高緯度苔原和針葉林、中緯度闊葉林和草原、高山和 高原地區普遍存在季節性、晝夜性甚至持續數小時的凍融循環。北半球近55%的陸地面積經歷季節性凍融,土壤凍融循環持續時間從幾天到150天不等。頻繁的凍融循環改變了土壤微生物群落結構和代謝,加速土壤有機質的分解,并以溫室氣體(如CO2、CH4和N2O)或溶解有機碳(DOC)的形式排放。這些過程已成為生態學、凍土學和生物地球化學研究的重點。凍融循環對地表土壤CO2和CH4通量的影響備受關注。一項研究發現,積雪對冬季土壤呼吸的影響是短暫的,厚度變化對CO2通量影響小。了解活動層過程對多年凍土區土壤CO2和CH4動態的響應和反饋至關重要。凍融循環頻率和持續時間對高寒地區土壤碳通量具有重要調控作用。不同生態系統在融化期具有較高的CO2和CH4通量,研究表明,在近地表土壤凍結期間CO2通量達到峰值,隨后顯著下降。春季融化期(20-30天)的甲烷通量占全年總量的11%。本研究在內蒙古自治區大興安嶺生態系統國家野外觀測研究站(NFORS-DXAE)進行。該地區具有典型的大陸性季風半干旱氣候,多年平均氣溫為-4.4°C,年蒸發潛力800-1200毫米,年降水量450-550毫米,其中60%集中在7月和8月,降雪期為9月至次年5月,平均降雪厚度約30厘米。實驗地塊位于海拔820米的北坡落葉松林,主要喬木為興安落葉松和白樺,平均胸高10 cm,平均樹高10±4.90 m。主要灌木為杜香,平均株高0.31±0.07 m,平均植被蓋度39±8%。土壤為棕色針葉林土,土層厚度30-40 cm(包括10 cm的腐殖質層),有機質含量42.74±0.92 g·kg?1。根據2009-2011年地溫數據,活動層厚度為0.5至2.0 m。圖1. 內蒙古自治區大興安嶺生態系統國家野外科學觀測研究站研...
發布時間: 2024 - 10 - 21
瀏覽次數:3
Rapid, Online Quantification of H2S in JP-8 Fuel Reformate Using Near-Infrared Cavity-Enhanced Laser Absorption Spectroscopy應用LGR激光痕量氣體分析儀快速在線量化JP-8(特級航空材料)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...
發布時間: 2015 - 10 - 10
瀏覽次數:78
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...
發布時間: 2015 - 09 - 15
瀏覽次數:43
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...
發布時間: 2015 - 08 - 11
瀏覽次數:47
DETECTION OF SUGARCANE AFRICAN STALK BORER ELDANASACCHARINA WALKER (LEPIDOPTERA: PYRALIDAE) USINGHYPERSPECTRAL REMOTE SENSING (SPECTRORADIOMETRY)應用ASD地物光譜儀檢測蛀蟲ELDANA SACCHARINA(鱗翅目:螟蛾科)對非洲甘蔗莖部的危害程度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...
發布時間: 2015 - 08 - 06
瀏覽次數:64
LGR氧化亞氮同位素分析儀測量水中硝酸鹽成功案例:Analytical Chemistry 文章:Combining Denitrifying Bacteria and Laser Spectroscopy for Isotopic Analyses (δ15N, δ18O) of Dissolved Nitrate通過反硝化細菌和激光同位素分析儀測定溶解硝酸鹽中的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 ...
發布時間: 2015 - 07 - 21
瀏覽次數:59
Nature 發表文章:In-situ unsaturated zone stable water isotope (2H and 18O) measurements in semi-arid environments using tunable o-axis integrated cavity output spectroscopy科學家應用LGR液態水同位素分析儀在半干旱環境下原位測量不飽和帶水中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...
發布時間: 2015 - 07 - 07
瀏覽次數:44
Inter- and intraindividual correlations of background abundances of 2H, 18O and 17O in human urine and implications for DLW measurements科學家應用LGR同位素分析儀測定人體尿液中的2H,18O和17O豐度間的相互作用對DLW測量方法的影響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...
發布時間: 2015 - 07 - 01
瀏覽次數:35
科學家應用Campbell CPEC200閉路渦動相關系統測量森林碳封存Canada: Forest Carbon SequestrationCampbell Scientific CPEC200 monitors eddy-covariance fluxes in British Columbia forest 文章下載地址:79canada-vancouver-island--CPEC200.pdf4da92e4cbee3e5c7273825cef11d6136.pdf (2.84 MB)
發布時間: 2015 - 05 - 19
瀏覽次數:49
Field Spectroscopy in the VNIR-SWIR Region to Discriminate between Mediterranean Native Plants and Exotic-Invasive Shrubs Based on Leaf Tannin Content      基于可見光近紅外(VNIR)和短波紅外(SWIR),科學家應用ASD地物光譜儀測量葉片單寧的含量,從而區分地中海附近海岸的本土植物和外來入侵灌木。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...
發布時間: 2015 - 05 - 12
瀏覽次數:123
科學家應用LGR氨氣分析儀快速原位機載測量空氣中氨氣的含量Fast in situ Airborne Measurement of AmmoniaUsing a Mid-Infrared Off-Axis ICOS Spectrometer科學家應用LGR氨氣分析儀快速原位機載測量空氣中氨氣的含量,這可以幫助我們更好的分析大氣的成分和氣溶膠的組成,具有深遠的意義。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...
發布時間: 2015 - 03 - 17
瀏覽次數:47
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