Influence of climate warming on serious low temperature and cold damage and cultivation pattern of spring maize in Northeast China Impacts of experimental atmospheric warming on soil microbial community structure in a tallgrass prairie The impacts of global climatic change on chilling damage distributions of maize in Northeast China Adjustment of Forest Ecosystem Root Respiration as Temperature Warms Photosynthetic and Respiratory Acclimation to Experimental Warming for Four Species in a Tallgrass Prairie Ecosystem