Based on the statistic data of crop yield and farmland produce investment in the period from 1990 to 2009
carbon emission
carbon absorption and carbon footprint of the farmland ecosystems were estimated in China.Conclusions were reached as follows:Carbon emission amount and intensity
carbon absorption amount
and carbon footprint on the increase
carbon absorption intensity was stable
with the large number of agricultural use of fossil energy
carbon footprint per unit area of 0.08 hm2/hm2 rose from 1990 to 20...