The East China belongs to the area of the high value (over (3t/hm~2)) and the agropastural ecotone in North China has the low value of carbon density which is less than (1t/hm~2).

• 农田C密度高值区主要分布在我国东部地区且多>3t/hm2；低值区主要分布在我国北方农牧交错带地区且普遍<1t/hm2。