ISSN:
1432-0789
Keywords:
Key words Global carbon cycle
;
Agroecosystems
;
Crop residue
;
Soil carbon
;
Sequestration
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract The carbon balance is ill defined for agricultural lands so that their role in global C balance cannot be accurately estimated. Changes in agriculture in the last 50 years have resulted in a general increase in grain yields, total net annual production (TNAP), and C input to the soil. Amounts of C returned annually with crop residues on Sanborn Field, one of the oldest experimental fields in the United States, increased after 1950, and this was accompanied by C accumulation in soils. Under wheat monocrop (with mineral fertilizer), C accumulated at a rate of 50 g m–2 year–1. A 3-year rotation (corn/wheat/clover) with manure and nitrogen applications sequestered 150 g m–2 year–1 of C. Total C balance for the wheat and corn production area in the United States, approximated on the basis of these rates, indicates that at least 32 Tg C was sequestered annually during the last 40–50 years.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s003740050427
Permalink
