A large carbon sink induced by the implementation of the largest afforestation program on Earth

Ecological Processes

Table 2 The soil carbon density differences between shelterbelts and farmland

Age	Shelterbelts (kg m⁻²)	0.5 H (kg m⁻²)	1 H (kg m⁻²)	2 H (kg m⁻²)	Farmland center (kg m⁻²)
≤ 10	12.75^a*	11.97^a	10.70^b	10.77^b	9.54^b
10–20	19.10^a	19.00^a	18.41^a	11.11^b	10.30^b
≥ 20	19.25^a	20.59^a	18.98^a	11.07^b	10.60^b

H: the hight of shelterbelts
^*: different letters represent significant differences at P = 0.05 level (age ≤ 10: F = 3.76, P = 0.0187 < 0.05; age 10–20: F = 3.19, P = 0.014 < 0.05; age ≥ 20: F = 7.09, P = 0.0083 < 0.05)