caa a22 4500 475751418 CHVBK 20180406123524.0 cr unu---uuuuu 170329e20001001xx s 000 0 eng 10.1023/A:1026578403956 doi (NATIONALLICENCE)springer-10.1023/A:1026578403956 Long-term dynamics of water and carbon in semi-arid ecosystems: a gradient analysis in the Patagonian steppe [Elektronische Daten] [Jose Paruelo, Osvaldo Sala, Adriana Beltrán] We used a soil water simulation model and remotely sensed data to study the long-term dynamics of transpiration, evaporation, drainage and net primary production across a precipitation gradient in Northwestern Patagonia (Argentina). The proportion of precipitation transpired, the precipitation use efficiency and the transpiration use efficiency were constant across the gradient that covered a range of 150 to 600mm. The proportion of water evaporated was higher than the proportion drained at the driest extreme of the gradient. The opposite relationship was observed at the wet extreme. Two important characteristics of arid-semiarid systems dominated by winter precipitation emerged from our analyses: the importance of drainage losses and the asynchrony between evaporation and transpiration fluxes. These characteristics of the water dynamics influence the relative abundance of plant functional types and are crucial to generate heterogeneity at the landscape level. The coefficient of variation (CV) of transpiration, evaporation and ANPP was, in general, lower than the CV of annual precipitation. This pattern suggests a buffering capacity of the ecosystem. The ecosystem would be able to damp at the functional level inter-annual changes in the availability of resources. Kluwer Academic Publishers, 2000 NOAA/AVHRR nationallicence Normalized difference vegetation index nationallicence Primary production nationallicence Simulation models nationallicence Paruelo Jose Depto. Ecología and IFE, Universidad de Buenos Aires, Av., San Martín 4453, 1417, Buenos Aires, VA, Facultad de Agronomía, Argentina aut Sala Osvaldo Depto. Ecología and IFE, Universidad de Buenos Aires, Av., San Martín 4453, 1417, Buenos Aires, VA, Facultad de Agronomía, Argentina aut Beltrán Adriana aut Plant Ecology Kluwer Academic Publishers 150/1-2(2000-10-01), 133-143 1385-0237 150:1-2<133 2000 150 11258 https://doi.org/10.1023/A:1026578403956 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1026578403956 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Paruelo Jose Depto. Ecología and IFE, Universidad de Buenos Aires, Av., San Martín 4453, 1417, Buenos Aires, VA, Facultad de Agronomía, Argentina aut NATIONALLICENCE 700 1- Sala Osvaldo Depto. Ecología and IFE, Universidad de Buenos Aires, Av., San Martín 4453, 1417, Buenos Aires, VA, Facultad de Agronomía, Argentina aut NATIONALLICENCE 700 1- Beltrán Adriana aut NATIONALLICENCE 773 0- Plant Ecology Kluwer Academic Publishers 150/1-2(2000-10-01), 133-143 1385-0237 150:1-2<133 2000 150 11258 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer