Journal Article climate change Research Support, U.S. Gov't, Non-P.H.S. precipitation 7440-44-0 Carbon Research Support, Non-U.S. Gov't Soil aboveground net primary production aboveground net primary productivity belowground net primary productivity biomass allocation carbon cycling drought grassland dynamics grassland productivity grasslands interannual variability legacy effect legacy effects meta-analysis nonlinear response root biomass soil fauna soil water spatiotemporal scales