Acclimation Acclimation ↑Photosynthesis ↑Respiration Nutrient availability Diminishing ↑Decomposition ◆Length of growing seasons ↑Drought 个Varming-or nutrient- I prone species t个Stress--toleran species Negative feedback Neutral Positive feedback LuoY.2007. Annu.Rev.Ecol.Evol.Syst.38:683-712