caa a22 4500 467885915 CHVBK 20180406152734.0 cr unu---uuuuu 170328e20060801xx s 000 0 eng 10.1007/s10021-006-0159-1 doi (NATIONALLICENCE)springer-10.1007/s10021-006-0159-1 Plasticity in Resource Allocation and Nitrogen-use Efficiency in Riparian Vegetation: Implications for Nitrogen Retention [Elektronische Daten] [John Schade, David Lewis] In this work, we summarize our current understanding of the function of riparian zones and describe an investigation of changes in the production per unit nitrogen (N) taken up, or nitrogen-use efficiency (NUE) and resource allocation of a riparian shrub in response to changes in N availability. Empirical work included measuring leaf %N and root-to-shoot ratios (R:S) of individual riparian shrubs (Baccharis salicifolia, or seepwillow) growing at a range of N availabilities in the field and growing in fertilized and unfertilized plots in a field fertilization experiment. In both observational and experimental work, N availability was related positively to %N of plant tissues and negatively to R:S. We used a simulation model to investigate feedbacks between seepwillow responses to and effects on N availability. In the model, plasticity in resource allocation and NUE in response to changes in N led to lower productivity at low N supply and higher productivity and lower retention at high N supply than was observed in plants constrained to a constant %N and R:S. Furthermore, uptake became relatively more important as a retention mechanism when plants responded to high N supply. These feedbacks could have significant effects on N retention by riparian zones in watersheds receiving large fertilizer inputs of N or on ecosystems exposed to high rates of atmospheric N deposition. Springer Science+Business Media, Inc., 2006 riparian vegetation nationallicence nitrogen retention nationallicence denitrification nationallicence resource allocation nationallicence nitrogen use efficiency nationallicence plasticity nationallicence Schade John School of Life Sciences, Arizona State University, 85287-4501, Tempe, Arizona, USA aut Lewis David School of Life Sciences, Arizona State University, 85287-4501, Tempe, Arizona, USA aut Ecosystems Springer-Verlag; www.springer-ny.com 9/5(2006-08-01), 740-755 1432-9840 9:5<740 2006 9 10021 https://doi.org/10.1007/s10021-006-0159-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-006-0159-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schade John School of Life Sciences, Arizona State University, 85287-4501, Tempe, Arizona, USA aut NATIONALLICENCE 700 1- Lewis David School of Life Sciences, Arizona State University, 85287-4501, Tempe, Arizona, USA aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag; www.springer-ny.com 9/5(2006-08-01), 740-755 1432-9840 9:5<740 2006 9 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer