Warming and increase of nitrogen (N) deposition have caused serious ecological-environmental issues. However, the uncertainty about how aboveground net primary production (ANPP) will respond to shifts of plant functional group (PFG) composition and change of soil N availability still limits us to predict global carbon (C) sequestration how to vary with future climate change. Although interactions between species composition and nutrient availabilities control long-term change in tundra productivity, the information on which process is a dominant factor controlling for ANPP is still lacking, especially in alpine meadow ecosystems, in the future climate change. We first determined the propose that PFG (i.e., grasses, forbs and legumes) composition, not N availability, determine the response of ANPP to warming using combined a controlled warming with grazing experiment for three years and with N fertilization experiment for two years in the alpine meadow.
Results/Conclusions A free-air temperature enhancement system (FATE) using infrared heaters and grazing significantly increased soil temperatures (average 0.5-1.6oC) from 0-40-cm depth for the 3-year. Neither warming nor grazing affected soil moisture except early in the growing seasons at 30-cm soil depth in 2006 and 2007, whereas warming in 2008 significantly decreased soil moisture at