Journal Article Research Support, Non-U.S. Gov't Tibetan Plateau 059QF0KO0R 1406-65-1 66974FR9Q1 Anti-Bacterial Agents Catalase Chloramphenicol Chlorophyll Chlorophyll A EC 1.11.1.6 EC 1.15.1.1 Reactive Oxygen Species Superoxide Dismutase Water YF5Q9EJC8Y alpine ecosystems alpine vegetation asymmetric warming climate change climate warming coupled air temperature and precipitation controls elevational shift grassland green-up date herbaceous plant phenology plant phenology preseason snowfall process-based modeling