Now showing items 12-31 of 299

    • Bacterioplankton community shifts in an Arctic lake correlate with seasonal changes in organic matter source 

      Crump, Byron C.; Kling, George W.; Bahr, Michele; Hobbie, John E. (American Society for Microbiology, 2003-04)
      Seasonal shifts in bacterioplankton community composition in Toolik Lake, a tundra lake on the North Slope of Alaska, were related to shifts in the source (terrestrial versus phytoplankton) and lability of dissolved organic ...
    • Barnegat Bay-Little Egg Harbor Estuary : case study of a highly eutrophic coastal bay system 

      Kennish, Michael J.; Bricker, Suzanne B.; Dennison, William C.; Glibert, Patricia M.; Livingston, Robert J.; Moore, Kenneth A.; Noble, Rachel T.; Paerl, Hans W.; Ramstack, Joy M.; Seitzinger, Sybil P.; Tomasko, David A.; Valiela, Ivan (2006-09-26)
      The Barnegat Bay-Little Egg Harbor Estuary is classified here as a highly eutrophic estuary based on application of NOAA’s National Estuarine Eutrophication Assessment model. Because it is shallow, poorly flushed, and ...
    • Benthic community metabolism in deep and shallow Arctic lakes during 13 years of whole–lake fertilization 

      Daniels, William C.; Kling, George W.; Giblin, Anne E. (2015-05)
      Benthic primary production and oxygen consumption are important components of lake biogeochemical cycling. We performed whole-lake nutrient manipulations in arctic Alaska to assess the controls of lake morphometry, ...
    • Better to light a candle than curse the darkness : illuminating spatial localization and temporal dynamics of rapid microbial growth in the rhizosphere 

      Herron, Patrick M.; Gage, Daniel J.; Pinedo, Catalina Arango; Haider, Zane K.; Cardon, Zoe G. (Frontiers Media, 2013-09-02)
      The rhizosphere is a hotbed of microbial activity in ecosystems, fueled by carbon compounds from plant roots. Basic questions about the location and dynamics of plant-spurred microbial growth in the rhizosphere are difficult ...
    • Beyond leaf color : comparing camera-based phenological metrics with leaf biochemical, biophysical, and spectral properties throughout the growing season of a temperate deciduous forest 

      Yang, Xi; Tang, Jianwu; Mustard, John F. (John Wiley & Sons, 2014-03-31)
      Plant phenology, a sensitive indicator of climate change, influences vegetation-atmosphere interactions by changing the carbon and water cycles from local to global scales. Camera-based phenological observations of the ...
    • Biogeography of bacterioplankton in lakes and streams of an arctic tundra catchment 

      Crump, Byron C.; Adams, Heather E.; Hobbie, John E.; Kling, George W. (Ecological Society of America, 2007-06)
      Bacterioplankton community composition was compared across 10 lakes and 14 streams within the catchment of Toolik Lake, a tundra lake in Arctic Alaska, during seven surveys conducted over three years using denaturing ...
    • Biomass and toxicity responses of poison ivy (Toxicodendron radicans) to elevated atmospheric CO2 : reply 

      Mohan, Jacqueline E.; Ziska, Lewis H.; Thomas, Richard B.; Sicher, Richard C.; George, Kate; Clark, James S.; Schlesinger, William H. (Ecological Society of America, 2008-02)
    • Biomass offsets little or none of permafrost carbon release from soils, streams, and wildfire : an expert assessment 

      Abbott, Benjamin W.; Jones, Jeremy B.; Schuur, Edward A. G.; Chapin, F. Stuart; Bowden, William B.; Bret-Harte, M. Syndonia; Epstein, Howard E.; Flannigan, Michael; Harms, Tamara K.; Hollingsworth, Teresa N.; Mack, Michelle C.; McGuire, A. David; Natali, Susan M.; Rocha, Adrian V.; Tank, Suzanne E.; Turetsky, Merritt R.; Vonk, Jorien E.; Wickland, Kimberly; Aiken, George R.; Alexander, Heather D.; Amon, Rainer M. W.; Benscoter, Brian; Bergeron, Yves; Bishop, Kevin; Blarquez, Olivier; Bond-Lamberty, Benjamin; Breen, Amy L.; Buffam, Ishi; Cai, Yihua; Carcaillet, Christopher; Carey, Sean K.; Chen, Jing M.; Chen, Han Y. H.; Christensen, Torben R.; Cooper, Lee W.; Cornelissen, J. Hans C.; de Groot, William J.; DeLuca, Thomas Henry; Dorrepaal, Ellen; Fetcher, Ned; Finlay, Jacques C.; Forbes, Bruce C.; French, Nancy H. F.; Gauthier, Sylvie; Girardin, Martin; Goetz, Scott J.; Goldammer, Johann G.; Gough, Laura; Grogan, Paul; Guo, Laodong; Higuera, Philip E.; Hinzman, Larry; Hu, Feng Sheng; Hugelius, Gustaf; JAFAROV, ELCHIN; Jandt, Randi; Johnstone, Jill F.; Karlsson, Jan; Kasischke, Eric S.; Kattner, Gerhard; Kelly, Ryan; Keuper, Frida; Kling, George W.; Kortelainen, Pirkko; Kouki, Jari; Kuhry, Peter; Laudon, Hjalmar; Laurion, Isabelle; Macdonald, Robie W.; Mann, Paul J.; Martikainen, Pertti; McClelland, James W.; Molau, Ulf; Oberbauer, Steven F; Olefeldt, David; Paré, David; Parisien, Marc-André; Payette, Serge; Peng, Changhui; Pokrovsky, Oleg; Rastetter, Edward B.; Raymond, Peter A.; Raynolds, Martha K.; Rein, Guillermo; Reynolds, James F.; Robards, Martin; Rogers, Brendan; Schädel, Christina; Schaefer, Kevin; Schmidt, Inger K.; Shvidenko, Anatoly; Sky, Jasper; Spencer, Robert G. M.; Starr, Gregory; Striegl, Robert; Teisserenc, Roman; Tranvik, Lars J.; Virtanen, Tarmo; Welker, Jeffrey M.; Zimov, Sergey (IOPScience, 2016-03-07)
      As the permafrost region warms, its large organic carbon pool will be increasingly vulnerable to decomposition, combustion, and hydrologic export. Models predict that some portion of this release will be offset by increased ...
    • Biomass transfer subsidizes nitrogen to offshore food webs 

      Nelson, James A.; Stallings, Christopher D.; Landing, William M.; Chanton, Jeffrey P. (2013-03-17)
      We evaluated the potential contribution of allochthonous biomass subsidies to the upper trophic levels of offshore food webs in the northeastern Gulf of Mexico (GOM). We made this evaluation considering nitrogen, an essential ...
    • Burn severity influences postfire CO2 exchange in Arctic tundra 

      Rocha, Adrian V.; Shaver, Gaius R. (Ecological Society of America, 2011-03)
      Burned landscapes present several challenges to quantifying landscape carbon balance. Fire scars are composed of a mosaic of patches that differ in burn severity, which may influence postfire carbon budgets through damage ...
    • Calcification and growth processes in planktonic foraminifera complicate the use of B/Ca and U/Ca as carbonate chemistry proxies 

      Salmon, Kate H.; Anand, Pallavi; Sexton, Philip F.; Conte, Maureen (Elsevier, 2016-06-08)
      Although boron and uranium to calcium ratios (B/Ca, U/Ca) in planktonic foraminifera have recently received much attention as potential proxies for ocean carbonate chemistry, the extent of a carbonate chemistry control on ...
    • Carbon turnover in Alaskan tundra soils : effects of organic matter quality, temperature, moisture and fertilizer 

      Shaver, Gaius R.; Giblin, Anne E.; Nadelhoffer, Knute J.; Thieler, K. K.; Downs, M. R.; Laundre, James A.; Rastetter, Edward B. (2006-02-15)
      Soils of tundra and boreal ecosystems contain large organic matter stocks, typically as a layer of peat that blankets the underlying mineral soil. Despite the low productivity of northern vegetation, organic matter accumulates ...
    • Carbon, water, and energy fluxes in a semiarid cold desert grassland during and following multiyear drought 

      Bowling, D. R.; Bethers-Marchetti, S.; Lunch, Claire K.; Grote, E. E.; Belnap, J. (American Geophysical Union, 2010-11-18)
      The net exchanges of carbon dioxide, water vapor, and energy were examined in a perennial Colorado Plateau grassland for 5 years. The study began within a multiyear drought and continued as the drought ended. The grassland ...
    • The changing landscape : ecosystem responses to urbanization and pollution across climatic and societal gradients 

      Grimm, Nancy B.; Foster, David R.; Groffman, Peter M.; Grove, J. Morgan; Hopkinson, Charles S.; Nadelhoffer, Knute J.; Pataki, Diane E.; Peters, Debra P. C. (Ecological Society of America, 2008-06)
      Urbanization, an important driver of climate change and pollution, alters both biotic and abiotic ecosystem properties within, surrounding, and even at great distances from urban areas. As a result, research challenges and ...
    • China's changing landscape during the 1990s : large-scale land transformations estimated with satellite data 

      Liu, Jiyuan; Tian, Hanqin; Liu, Mingliang; Zhuang, Dafang; Melillo, Jerry M.; Zhang, Zengxiang (American Geophysical Union, 2005-01-27)
      Land-cover changes in China are being powered by demand for food for its growing population and by the nation's transition from a largely rural society to one in which more than half of its people are expected to live in ...
    • China's terrestrial carbon balance : contributions from multiple global change factors 

      Tian, Hanqin; Melillo, Jerry M.; Lu, Chaoqun; Kicklighter, David W.; Liu, Mingliang; Ren, Wei; Xu, Xiaofeng; Chen, Guangsheng; Zhang, Chi; Pan, Shufen; Liu, Jiyuan; Running, Steven W. (American Geophysical Union, 2011-03-31)
      The magnitude, spatial, and temporal patterns of the terrestrial carbon sink and the underlying mechanisms remain uncertain and need to be investigated. China is important in determining the global carbon balance in terms ...
    • Climate and species affect fine root production with long-term fertilization in acidic tussock tundra near Toolik Lake, Alaska 

      Sullivan, Patrick F.; Sommerkorn, Martin; Rueth, Heather M.; Nadelhoffer, Knute J.; Shaver, Gaius R.; Welker, Jeffrey M. (2007-04-12)
      Long-term fertilization of acidic tussock tundra has led to changes in plant species composition, increases in aboveground production and biomass and substantial losses of soil organic carbon (SOC). Root litter is an ...
    • Climate change decreases nitrogen pools and mineralization rates in northern hardwood forests 

      Durán, Jorge; Morse, Jennifer L.; Groffman, Peter M.; Campbell, John L.; Christenson, Lynn M.; Driscoll, Charles T.; Fahey, Timothy J.; Fisk, Melany C.; Likens, Gene E.; Melillo, Jerry M.; Mitchell, Myron J.; Templer, Pamela H.; Vadeboncoeur, Matthew A. (John Wiley & Sons, 2016-03-22)
      Nitrogen (N) supply often limits the productivity of temperate forests and is regulated by a complex mix of biological and climatic drivers. In excess, N is linked to a variety of soil, water, and air pollution issues. ...
    • Climate impacts of a large-scale biofuels expansion 

      Hallgren, Willow; Schlosser, C. Adam; Monier, Erwan; Kicklighter, David W.; Sokolov, Andrei P.; Melillo, Jerry M. (John Wiley & Sons, 2013-04-28)
      A global biofuels program will potentially lead to intense pressures on land supply and cause widespread transformations in land use. These transformations can alter the Earth climate system by increasing greenhouse gas ...
    • CO2 and CH4 exchanges between land ecosystems and the atmosphere in northern high latitudes over the 21st century 

      Zhuang, Qianlai; Melillo, Jerry M.; Sarofim, Marcus C.; Kicklighter, David W.; McGuire, A. David; Felzer, Benjamin S.; Sokolov, Andrei P.; Prinn, Ronald G.; Steudler, Paul A.; Hu, Shaomin (American Geophysical Union, 2006-09-15)
      Terrestrial ecosystems of the northern high latitudes (above 50oN) exchange large amounts of CO2 and CH4 with the atmosphere each year. Here we use a process-based model to estimate the budget of CO2 and CH4 of the region ...