caa a22 4500 445383496 CHVBK 20180317143024.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10021-010-9401-y doi (NATIONALLICENCE)springer-10.1007/s10021-010-9401-y Plants Mediate the Sensitivity of Soil Respiration to Rainfall Variability [Elektronische Daten] [Zachary Aanderud, Donald Schoolmaster Jr., Jay Lennon] Soil respiration from grasslands plays a critical role in determining carbon dioxide (CO2) feedbacks between soils and the atmosphere. In these often mesic systems, soil moisture and temperature tend to co-regulate soil respiration. Increasing variance of rainfall patterns may alter aboveground-belowground interactions and have important implications for the sensitivity of soil respiration to fluctuations in moisture and temperature. We conducted a set of field experiments to evaluate the independent and interactive effects of rainfall variability and plant-soil processes on respiration dynamics. Plant removal had strong effects on grassland soils, which included altered CO2 flux owing to absence of root respiration; increased soil moisture and temperature; and reduced availability of dissolved organic carbon (DOC) for heterotrophic respiration by microorganisms. These plant-mediated effects interacted with our rainfall variability treatments to determine the sensitivity of soil respiration to both moisture and temperature. Using time-series multiple regression, we found that plants dampened the sensitivity of respiration to moisture under high variability rainfall treatments, which may reflect the relative stability of root contributions to total soil respiration. In contrast, plants increased the sensitivity of respiration to temperature under low variability rainfall treatment suggesting that the environmental controls on soil CO2 dynamics in mesic habitats may be context dependent. Our results provide insight into the aboveground-belowground mechanisms controlling respiration in grasslands under variable rainfall regimes, which may be important for predicting CO2 dynamics under current and future climate scenarios. Springer Science+Business Media, LLC, 2010 CO2 nationallicence heterotrophic respiration nationallicence pulse nationallicence root respiration nationallicence time-series nationallicence sensors nationallicence microbial nationallicence climate change nationallicence precipitation nationallicence Aanderud Zachary W. K. Kellogg Biological Station, Michigan State University, 3700 East Gull Lake Drive, 49060, Hickory Corners, Michigan, USA aut Schoolmaster Jr. Donald W. K. Kellogg Biological Station, Michigan State University, 3700 East Gull Lake Drive, 49060, Hickory Corners, Michigan, USA aut Lennon Jay W. K. Kellogg Biological Station, Michigan State University, 3700 East Gull Lake Drive, 49060, Hickory Corners, Michigan, USA aut Ecosystems Springer-Verlag 14/1(2011-01-01), 156-167 1432-9840 14:1<156 2011 14 10021 https://doi.org/10.1007/s10021-010-9401-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-010-9401-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Aanderud Zachary W. K. Kellogg Biological Station, Michigan State University, 3700 East Gull Lake Drive, 49060, Hickory Corners, Michigan, USA aut NATIONALLICENCE 700 1- Schoolmaster Jr Donald W. K. Kellogg Biological Station, Michigan State University, 3700 East Gull Lake Drive, 49060, Hickory Corners, Michigan, USA aut NATIONALLICENCE 700 1- Lennon Jay W. K. Kellogg Biological Station, Michigan State University, 3700 East Gull Lake Drive, 49060, Hickory Corners, Michigan, USA aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag 14/1(2011-01-01), 156-167 1432-9840 14:1<156 2011 14 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer