Journal Article Research Support, Non-U.S. Gov't 7440-44-0 Carbon 059QF0KO0R 9005-25-8 Carbohydrates GPP capacity PhenObs phenological network Starch Water botanical gardens carbon ages and transit times carbon allocation first flowering day growing season length leaf traits modeling neutral lipids nitrogen deposition non-structural carbohydrates (NSC) nonstructural carbohydrates nutrient imbalance phenology phylogeny random forest semi-arid starch structure and physiology tree carbon dynamics