%0 Journal Article %1 Mueller_2016 %A Mueller, K. E. %A Blumenthal, D. M. %A Pendall, E. %A Carrillo, Y. %A Dijkstra, F. A. %A Williams, D. G. %A Follett, R. F. %A Morgan, J. A. %D 2016 %E Penuelas, Josep %I Wiley %J Ecology Letters %K FACE PHACE %N 8 %P 956--966 %R 10.1111/ele.12634 %T Impacts of warming and elevated CO2 on a semi-arid grassland are non-additive, shift with precipitation, and reverse over time %U https://doi.org/10.1111%2Fele.12634 %V 19 %X It is unclear how elevated CO2 (eCO2) and the corresponding shifts in temperature and precipita- tion will interact to impact ecosystems over time. During a 7-year experiment in a semi-arid grass- land, the response of plant biomass to eCO2 and warming was largely regulated by interannual precipitation, while the response of plant community composition was more sensitive to experi- ment duration. The combined effects of eCO2 and warming on aboveground plant biomass were less positive in ‘wet’ growing seasons, but total plant biomass was consistently stimulated by ~ 25% due to unique, supra-additive responses of roots. Independent of precipitation, the com- bined effects of eCO2 and warming on C3 graminoids became increasingly positive and supra- additive over time, reversing an initial shift toward C4 grasses. Soil resources also responded dynamically and non-additively to eCO2 and warming, shaping the plant responses. Our results suggest grasslands are poised for drastic changes in function and highlight the need for long-term, factorial experiments.

@article{Mueller_2016, abstract = {It is unclear how elevated CO2 (eCO2) and the corresponding shifts in temperature and precipita- tion will interact to impact ecosystems over time. During a 7-year experiment in a semi-arid grass- land, the response of plant biomass to eCO2 and warming was largely regulated by interannual precipitation, while the response of plant community composition was more sensitive to experi- ment duration. The combined effects of eCO2 and warming on aboveground plant biomass were less positive in ‘wet’ growing seasons, but total plant biomass was consistently stimulated by ~ 25% due to unique, supra-additive responses of roots. Independent of precipitation, the com- bined effects of eCO2 and warming on C3 graminoids became increasingly positive and supra- additive over time, reversing an initial shift toward C4 grasses. Soil resources also responded dynamically and non-additively to eCO2 and warming, shaping the plant responses. Our results suggest grasslands are poised for drastic changes in function and highlight the need for long-term, factorial experiments. }, added-at = {2019-08-17T20:36:35.000+0200}, author = {Mueller, K. E. and Blumenthal, D. M. and Pendall, E. and Carrillo, Y. and Dijkstra, F. A. and Williams, D. G. and Follett, R. F. and Morgan, J. A.}, biburl = {https://www.bibsonomy.org/bibtex/23d8308cd9d5458b54a8d4a77db7063ab/karinawilliams}, doi = {10.1111/ele.12634}, editor = {Penuelas, Josep}, interhash = {ae9d40f2942c5caefee5cb65251b8b43}, intrahash = {3d8308cd9d5458b54a8d4a77db7063ab}, journal = {Ecology Letters}, keywords = {FACE PHACE}, month = jun, number = 8, pages = {956--966}, publisher = {Wiley}, timestamp = {2019-08-17T20:36:35.000+0200}, title = {Impacts of warming and elevated {CO}2 on a semi-arid grassland are non-additive, shift with precipitation, and reverse over time}, url = {https://doi.org/10.1111%2Fele.12634}, volume = 19, year = 2016 }