Table 3.

Characteristic comparisons between federal lands and nonfederal lands

Land use/land cover
Time	Unit	Agriculture*	Forests	Grassland/shrubland	Other	Wetlands	Total/mean
Federal lands
2005	Land area, km2	33,150	689,363	955,113	131,444	43,331	1,852,400
2050		43,227	684,188	946,592	135,013	43,381	1,852,400
2005	Areal % of the total	1.8	37.2	51.6	7.1	2.3	100
2005	Ecosystem C stock, Tg	108	8,796	1,993	60	656	11,613
2050		177	10,598	2,153	62	876	13,865
Change from 2005	Tg	69	1,802	160	2	220	2,252
Contribution to change, %		3.1	80.0	7.1	0.1	9.8	100
2005	C density, Mg C⋅ha−1	33	128	21	5	151	63
2050		40	129	30	11	138	64
Sequestration rate	kg C⋅ha−1⋅y−1	185	607	42	0	1,124	270
Nonfederal lands†
2005	Land area, km2	1,999,561	1,634,439	1,701,953	424,468	268,265	6,028,685
2050		2,207,092	1,527,454	1,477,775	551,224	266,183	6,028,700
2005	Areal % of the total	33.2	27.1	28.2	7.0	4.4	100
2005	Ecosystem C stock, Tg	7,956	21,013	5,144	483	3,714	38,310
2050		10,669	29,354	6,374	753	5,473	52,622
Change from 2005	Tg	2,713	8,341	1,229	270	1,759	14,313
Contribution to change, %		19.0	58.3	8.6	1.9	12.3	100
2005	C density, Mg C⋅ha−1	41	155	23	5	202	75
2050		48	192	43	14	206	87
Sequestration rate	kg C⋅ha−1⋅y−1	190	1,414	287	51	1,493	528

^*Includes both croplands and pasture/hay classes.

^†Synthesized from Zhu and Reed (18, 19).