<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Melack, J. M.</style></author><author><style face="normal" font="default" size="100%">Finzi, A. C.</style></author><author><style face="normal" font="default" size="100%">Siegal, D.</style></author><author><style face="normal" font="default" size="100%">MacIntyre, S.</style></author><author><style face="normal" font="default" size="100%">Nelson, C. E.</style></author><author><style face="normal" font="default" size="100%">Aufdenkampe, A. K.</style></author><author><style face="normal" font="default" size="100%">Pace, M. L.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Improving biogeochemical knowledge through technical innovation.</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">MCR</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2011</style></year></dates><volume><style face="normal" font="default" size="100%">9</style></volume><pages><style face="normal" font="default" size="100%">37-43</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The understanding of biogeochemical cycles has benefited from technological advances facilitating new kinds of measurements and observations. Satellite-borne ocean-color sensors that assess the physiological status of phytoplankton have led to improved estimates of oceanic productivity, as have micrometeorological approaches measuring terrestrial photosynthesis and respiration. The advent of satellites fitted with synthetic aperture radar (a specialized sensor used to determine inundation extent and vegetation types in wetlands)has revealed large fluxes of carbon dioxide and methane from these areas. Advances in the measurement of chemical constituents and turbulence have allowed the detection of high-resolution coupling between physical and biogeochemical processes. Genomics and proteomics - the study of genes and of an organism's complement of proteins, respectively - have revolutionized our understanding of the types of cells present in the environment and their ability to transform elements by allowing direct assessment of gene and protein sequences.</style></abstract><issue><style face="normal" font="default" size="100%">1</style></issue><accession-num><style face="normal" font="default" size="100%">LTER.2011-86098</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Collins, Scott L.</style></author><author><style face="normal" font="default" size="100%">Kaye, J.P.</style></author><author><style face="normal" font="default" size="100%">A.K. Knapp</style></author><author><style face="normal" font="default" size="100%">Kofinas, G.P.</style></author><author><style face="normal" font="default" size="100%">Magnuson, J.J.</style></author><author><style face="normal" font="default" size="100%">McDowell, W.H.</style></author><author><style face="normal" font="default" size="100%">Melack, J. M.</style></author><author><style face="normal" font="default" size="100%">Ogden, L.A.</style></author><author><style face="normal" font="default" size="100%">Robertson, G.P.</style></author><author><style face="normal" font="default" size="100%">Smith, M.D.</style></author><author><style face="normal" font="default" size="100%">Whitmer, A.C.</style></author><author><style face="normal" font="default" size="100%">Carpenter, S.R.</style></author><author><style face="normal" font="default" size="100%">Swinton, S.M.</style></author><author><style face="normal" font="default" size="100%">Orenstein, D.E.</style></author><author><style face="normal" font="default" size="100%">Childers, D.L.</style></author><author><style face="normal" font="default" size="100%">Gragson, T.L.</style></author><author><style face="normal" font="default" size="100%">Grimm, N.B.</style></author><author><style face="normal" font="default" size="100%">Grove, J.M.</style></author><author><style face="normal" font="default" size="100%">Harlan, S.L.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">An integrated conceptual framework for long-term social-ecological research</style></title><secondary-title><style face="normal" font="default" size="100%">Frontiers in Ecology and the Environment</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">BNZ</style></keyword><keyword><style  face="normal" font="default" size="100%">FCE</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2010</style></year></dates><language><style face="normal" font="default" size="100%">eng</style></language><accession-num><style face="normal" font="default" size="100%">LTER.2010-86584</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Claessens, L.</style></author><author><style face="normal" font="default" size="100%">Tague, C. L.</style></author><author><style face="normal" font="default" size="100%">Groffman, P.M.</style></author><author><style face="normal" font="default" size="100%">Melack, J. M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Longitudinal and seasonal variation of stream N uptake in an urbanizing watershed: effect of organic matter, stream size, transient storage and debris dams</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">BES</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2010</style></year></dates><edition><style face="normal" font="default" size="100%">6 October 2009</style></edition><volume><style face="normal" font="default" size="100%">98</style></volume><pages><style face="normal" font="default" size="100%">45-62</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">We examined seasonal and spatial linkages between N cycling and organic matter for a suburban stream in Maryland and addressed the question: How do longitudinal NH4+ uptake patterns vary seasonally and what is the effect of organic matter, stream size, transient storage and debris dams? We applied a longitudinal (stream channel corridor) approach in a forested stream section and conducted short-term nutrient addition experiments (adapted to account for the effect of nutrient saturation) covering 14–16 reaches, and compared two distinct seasons (late fall 2003 and late summer 2004). Longitudinal NH4+ uptake rate patterns had a distinct seasonal reversal; fall had the highest uptake rates in the upper reaches, while summer had the highest uptake rates in the lower reaches. This seasonal reversal was attributed to organic matter and evidenced by DON patterns. Transient storage did not have an expected effect on uptake rates in fall because it was confounded by leaf litter; litter produced higher uptakes, but also may have reduced transient storage. In summer however, uptake rates had a positive correlation with transient storage. Debris dams had no distinct effect on uptake in fall because of their recent formation. In summer however, the debris dam effect was significant; although the debris dams were hydraulically inactive then, the upstream reaches had 2–5 fold higher uptake rates. The seasonal and longitudinal differences in NH4+ uptake reflect interactions between flow conditions and the role of organic matter. Urbanization can alter both of these characteristics, hence affect stream N processing.</style></abstract><accession-num><style face="normal" font="default" size="100%">LTER.2010-85685</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Claessens, L.</style></author><author><style face="normal" font="default" size="100%">Tague, C. L.</style></author><author><style face="normal" font="default" size="100%">Groffman, P.M.</style></author><author><style face="normal" font="default" size="100%">Melack, J. M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Longitudinal assessment of the effect of concentration on stream N uptake rates in an urbanizing watershed</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">BES</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2010</style></year></dates><edition><style face="normal" font="default" size="100%">06 October 2009</style></edition><volume><style face="normal" font="default" size="100%">98</style></volume><pages><style face="normal" font="default" size="100%">63-74</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">We examined the effect of concentration on nitrogen uptake patterns for a suburban stream in Maryland and addressed the question: How does NO3- uptake change as a function of concentration and how do uptake patterns compare with those found for NH4+?  We applied a longitudinal (stream channel corridor) approach in a forested stream section and conducted short-term nutrient addition experiments in late summer 2004.  In the downstream direction, NO3- concentrations decreased because of residential development in headwaters and downstream dilution; NH4+ concentrations slightly increased.  The uptake patterns forNO3- were very different from NH4+. While NH4+ had a typical negative relationship between first-order uptake rate constant (Kc) and stream size, NO3- had a reverse pattern.  We found differences for other metrics, including uptake velocity (Vf) and areal uptake rate (U).  We attributed these differences to a stream size effect, a concentration effect and a biological uptake capacity effect. For NO3- these combined effects produced a downstream increase in Kc, Vf and U; for NH4+ they produced a downstream decrease in Kc and Vf, and a not well defined pattern for U.  We attributed a downstream increase in NO3- uptake capacity to an increase in hyporheic exchange and a likely increase in carbon availability.  We also found that Kc and Vf were indirectly related with concentration.  Similar evidence of ‘nutrient saturation’ has been reported in other recent studies.  Our results suggest that higher-order uptake models might be warranted when scaling NO3- uptake across watersheds that are subject to increased nitrogen loading.</style></abstract><accession-num><style face="normal" font="default" size="100%">LTER.2010-85684</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>5</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">MacIntyre, S.</style></author><author><style face="normal" font="default" size="100%">Melack, J. M.</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">Likens, G.</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Lakes across climate zones</style></title><secondary-title><style face="normal" font="default" size="100%">Encyclopedia of Inland Waters</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">ARC</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2009</style></year></dates><publisher><style face="normal" font="default" size="100%">Elsevier</style></publisher><language><style face="normal" font="default" size="100%">eng</style></language><accession-num><style face="normal" font="default" size="100%">LTER.2009-83743</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">MacKay, M. D.</style></author><author><style face="normal" font="default" size="100%">Litchman, E.</style></author><author><style face="normal" font="default" size="100%">MacIntyre, S.</style></author><author><style face="normal" font="default" size="100%">Marsh, P.</style></author><author><style face="normal" font="default" size="100%">Melack, J. M.</style></author><author><style face="normal" font="default" size="100%">Mooij, W. M.</style></author><author><style face="normal" font="default" size="100%">Peeters, F.</style></author><author><style face="normal" font="default" size="100%">Quesada, A.</style></author><author><style face="normal" font="default" size="100%">Schladow, S. G.</style></author><author><style face="normal" font="default" size="100%">Schmid, M.</style></author><author><style face="normal" font="default" size="100%">Spence, C.</style></author><author><style face="normal" font="default" size="100%">Neale, P. J.</style></author><author><style face="normal" font="default" size="100%">Stefan, H. G.</style></author><author><style face="normal" font="default" size="100%">Stokes, S. L.</style></author><author><style face="normal" font="default" size="100%">Arp, C. D.</style></author><author><style face="normal" font="default" size="100%">De Senerpont Domis, L. N.</style></author><author><style face="normal" font="default" size="100%">Fang, X.</style></author><author><style face="normal" font="default" size="100%">Gal, G.</style></author><author><style face="normal" font="default" size="100%">Jöhnk, K.</style></author><author><style face="normal" font="default" size="100%">Kirillin, G.</style></author><author><style face="normal" font="default" size="100%">Lenters, J. D.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Modeling lakes and reservoirs in the climate system</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">ARC</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2009</style></year></dates><volume><style face="normal" font="default" size="100%">54(6, )</style></volume><pages><style face="normal" font="default" size="100%">2315-2329</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><issue><style face="normal" font="default" size="100%">2</style></issue><accession-num><style face="normal" font="default" size="100%">LTER.2009-83744</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Turk, J.T.</style></author><author><style face="normal" font="default" size="100%">Taylor, H.E.</style></author><author><style face="normal" font="default" size="100%">Ingersoll, G.P.</style></author><author><style face="normal" font="default" size="100%">Tonnessen, K.A.</style></author><author><style face="normal" font="default" size="100%">Clow, D. W.</style></author><author><style face="normal" font="default" size="100%">Mast, M.A.</style></author><author><style face="normal" font="default" size="100%">Cambell, D.H.</style></author><author><style face="normal" font="default" size="100%">Melack, J. M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Major-ion chemistry of the Rocky Mountain snowpack, USA</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">NWT</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2001</style></year></dates><volume><style face="normal" font="default" size="100%">35</style></volume><pages><style face="normal" font="default" size="100%">3957-3966</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><accession-num><style face="normal" font="default" size="100%">LTER.2001-66159</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Williams, M. W.</style></author><author><style face="normal" font="default" size="100%">Bales, R.C.</style></author><author><style face="normal" font="default" size="100%">Brown, A.D.</style></author><author><style face="normal" font="default" size="100%">Melack, J. M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Fluxes and transformations of nitrogen in a high-elevation catchment, Sierra Nevada</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">NWT</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1995</style></year></dates><volume><style face="normal" font="default" size="100%">28</style></volume><pages><style face="normal" font="default" size="100%">1-31</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><accession-num><style face="normal" font="default" size="100%">LTER.1995-65969</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Meyer, J.L.</style></author><author><style face="normal" font="default" size="100%">McDowell, W.H.</style></author><author><style face="normal" font="default" size="100%">Bott, T. L.</style></author><author><style face="normal" font="default" size="100%">Elwood, J. W.</style></author><author><style face="normal" font="default" size="100%">Ishizaki, C.</style></author><author><style face="normal" font="default" size="100%">Melack, J. M.</style></author><author><style face="normal" font="default" size="100%">Peckarsky, B. L.</style></author><author><style face="normal" font="default" size="100%">Peterson, B.J.</style></author><author><style face="normal" font="default" size="100%">Rublee, P.A.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Elemental dynamics in streams</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">ARC</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1988</style></year></dates><pages><style face="normal" font="default" size="100%">410-432</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><accession-num><style face="normal" font="default" size="100%">LTER.1988-70885</style></accession-num></record></records></xml>