caa a22 4500 477111947 CHVBK 20180405111611.0 cr unu---uuuuu 170330e19960501xx s 000 0 eng 10.1007/BF00011002 doi (NATIONALLICENCE)springer-10.1007/BF00011002 The effect of nitrogen fertilization on the phenology of roots in a barrier island sand dune community [Elektronische Daten] [Everett Weber, Frank Day] Little work has been done on the phenology of root growth and senescence largely due to methodological difficulties. The application of minirhizotron technology has enabled the tracking of individual roots through an entire growing season. As a result, direct measures of mortality, root growth, and an analysis of cohorts can be obtained. This study examined the belowground response of vegetation in a nutrient limited system to nitrogen addition. Small plots on a 36 year old dune on Hog Island, a barrier island in the Virginia Coast Reserve Long Term Ecological Research Site, were fertilized with nitrogen. Minirhizotron tubes were installed in each fertilized and control plot. Each tube was sampled monthly for nine months, March through October of 1992. Root length density increased throughout the growing season with the greatest root length density in the top 20 cm of the soil profile. The fertilized plots had greater root length densities (14.1 mm cm-2) than the unfertilized plots (2.9 mm cm-2). There was no significant depth × treatment interaction. Root mortality did not significantly change with fertilization. The largest loss of roots for a cohort occurred within the first month. The dune grassland community did not respond to fertilization with large changes in root distribution or increases in mortality in this study. Kluwer Academic Publishers, 1996 fine roots nationallicence minirhizotron nationallicence mortality nationallicence nitrogen fertilization nationallicence phenology nationallicence root cohorts nationallicence Weber Everett Department of Biological Sciences, Old Dominion University, 23529, Norfolk, VA, USA aut Day Frank Department of Biological Sciences, Old Dominion University, 23529, Norfolk, VA, USA aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 182/1(1996-05-01), 139-148 0032-079X 182:1<139 1996 182 11104 https://doi.org/10.1007/BF00011002 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00011002 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Weber Everett Department of Biological Sciences, Old Dominion University, 23529, Norfolk, VA, USA aut NATIONALLICENCE 700 1- Day Frank Department of Biological Sciences, Old Dominion University, 23529, Norfolk, VA, USA aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 182/1(1996-05-01), 139-148 0032-079X 182:1<139 1996 182 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer