142M471B3J 3 Carbon Dioxide 3 Journal Article 3 gross ecosystem productivity ecosystem respiration 2 7440-44-0 1 Carbon 1 mehr ... N-P imbalance 1 N762921K75 1 Nitrogen 1 Old Black Spruce 1 Research Support, Non-U.S. Gov't 1 Soil 1 carbon (C) cycle 1 carbon use efficiency 1 climate change 1 complex terrain 1 drainage flows 1 drought 1 light use efficiency 1 long-term trends 1 microclimate 1 net ecosystem carbon exchange 1 net ecosystem exchange 1 net ecosystem productivity 1 nitrogen addition 1 nitrogen:phosphorous (N:P) ratio 1 southern boreal forest 1 water use efficiency 1 weniger ...