Abstract: Long-term forest biomass and meteorological data were used to study temperature gradient and
forest biomass distribution characteristics, with weighted biomass and geographical meteorological correlation
methods Total biomass and underground biomass along the temperature gradient showed similar distribution
characteristics Biomass increased with increasing temperature until a certain temperature value, after which the
forest biomass continued to increase with increasing temperature before biomass declined; this was followed by
 another sequence of increase-then-decrease above ground biomass showed little changes along the temperature
gradient; direct decline was observed with increasing temperature. This was followed by a sequence of increase then-decrease with further increasing temperatures The response mechanisms of above ground and below ground
plant growth to temperature gradient were found to be different, significant hysteresis was observed. For total
forest biomass, above ground biomass contributed more than underground biomass, stem biomass contributed
more than shoot biomass. These works indicate that there are clear rules correlating temperature change with
forest biomass variations in China. The effect of temperature changes on forest productivity is very significant.