caa a22 4500 475751302 CHVBK 20180406123524.0 cr unu---uuuuu 170329e20000201xx s 000 0 eng 10.1023/A:1009863201751 doi (NATIONALLICENCE)springer-10.1023/A:1009863201751 Gas exchange and water relations of two Rocky Mountain shrub species exposed to a climate change manipulation [Elektronische Daten] [M. Shaw, Michael Loik, John Harte] Gas exchange and water relations responses to warming were compared for two shrub species, Artemisia tridentata spp. vaseyana (Asteraceae), a widely distributed evergreen species of the Great Basin and the western slope of the Rocky Mountains, and Pentaphylloides floribunda (Rosaceae), a deciduous shrub limited in distribution to moist, high-elevation meadows. Plants were exposed to an in situ infrared (IR) climate change manipulation at the Rocky Mountain Biological Laboratory, near Crested Butte, CO. Measurements of gas exchange and water relations were made on the two species in July and August, 1993 from plants growing in situ in infrared-heated and control plots. Carbon dioxide uptake, water loss, leaf temperature, water use efficiency, and water potential were compared to test the hypothesis that leaf and soil responses to IR will cause leaf level changes in photosynthesis. Photosynthetic CO2 uptake and water use efficiency increased for A.tridentata (2.9 vs. 1.9μmolm−2s−1 and 1.2 vs. 0.7mmol C/mol H2O) in the heated plots compared to the controls, while water potential was significantly lower in the heated plots (−1.1 vs. −0.5MPa). The heating treatment decreased rates of photosynthesis for P.floribunda, but not significantly so. For A.tridentata, the results are consistent with the community-level changes observed with heating. Taken together, the evidence suggests that global warming is likely to result in increasing dominance of A.tridentata in subalpine meadow habitat now dominated by forbs. Kluwer Academic Publishers, 2000 Artemisia nationallicence Climate change nationallicence Pentaphylloides nationallicence Photosynthesis nationallicence Rocky Mountains nationallicence Subalpine nationallicence Transpiration nationallicence Water potential nationallicence Water use efficiency nationallicence Shaw M. Department of Plant Biology, Carnegie Institution of Washington, 260 Panama Street, 94305, Stanford, CA, USA aut Loik Michael Department of Biology, California State University, 92407-2397, San Bernardino, CA, USA aut Harte John Energy and Resources Group, University of California, 94720, Berkeley, CA, USA aut Plant Ecology Kluwer Academic Publishers 146/2(2000-02-01), 195-204 1385-0237 146:2<195 2000 146 11258 https://doi.org/10.1023/A:1009863201751 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1009863201751 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shaw M. Department of Plant Biology, Carnegie Institution of Washington, 260 Panama Street, 94305, Stanford, CA, USA aut NATIONALLICENCE 700 1- Loik Michael Department of Biology, California State University, 92407-2397, San Bernardino, CA, USA aut NATIONALLICENCE 700 1- Harte John Energy and Resources Group, University of California, 94720, Berkeley, CA, USA aut NATIONALLICENCE 773 0- Plant Ecology Kluwer Academic Publishers 146/2(2000-02-01), 195-204 1385-0237 146:2<195 2000 146 11258 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer