Journal Article 3 stem CO2 efflux 142M471B3J 2 Carbon Dioxide 2 13C labeling 1 7440-44-0 1 Carbon 1 mehr ... Picea abies 1 Research Support, Non-U.S. Gov't 1 Research Support, U.S. Gov't, Non-P.H.S. 1 climate change 1 drought 1 forest ecosystem 1 gross primary production 1 growth respiration 1 leaf area index 1 maintenance respiration 1 phloem 1 photosynthesis 1 recovery 1 respiration 1 root CO2 efflux 1 soil CO2 efflux 1 tropical rainforests 1 watering 1 woody tissue respiration 1 weniger ...