dc.contributor.author | Abraha, Michael | |
dc.contributor.author | Hamilton, Stephen K | |
dc.contributor.author | Chen, Jiquan | |
dc.contributor.author | Robertson, G Philip | |
dc.date.accessioned | 2019-06-19T13:05:11Z | |
dc.date.available | 2019-06-19T13:05:11Z | |
dc.date.issued | 2018 | |
dc.identifier.issn | 0168-1923 | |
dc.identifier.doi | 10.1016/j.agrformet.2018.02.016 | |
dc.identifier.uri | http://hdl.handle.net/10072/384943 | |
dc.description.abstract | Land use changes into and out of agricultural production may substantially influence ecosystem carbon (C) balance for many years. We examined ecosystem C balances for eight years after the conversion of 22 year-old Conservation Reserve Program (CRP) grasslands and formerly tilled agricultural fields (AGR) to annual (continuous no-till corn) and perennial (switchgrass and restored prairie) cropland. An unconverted CRP field (CRP-Ref) was maintained as a historical reference. Ecosystem C balance was assessed using adjusted net ecosystem carbon exchange (NEEadj) calculated by adding C removed in harvested biomass to NEE measured using eddy covariance method. The cumulative NEEadj of the corn and perennial systems on former CRP fields showed that these systems were a net C source to the atmosphere over the 8-year period while on former AGR fields, the perennial systems were net C sinks and the corn system near-neutral. The CRP-Ref was near neutral until a drought year when it became a net source. The corn system on the CRP field will likely reach a new lower soil C equilibrium at least 14 years after conversion but will never regain the C lost upon conversion under current no-till management with residue partially removed. On the other hand, the perennial systems could fully regain in ∼14 years the C lost following conversion. The cumulative NEEadj of the corn systems exhibited a higher C emission than did the perennial systems within the same land use histories, reflecting the dominant role of crop type and management in agricultural ecosystem C balance. Results suggest that converting croplands to grasslands results in immediate C gains whereas converting grasslands to croplands results in permanent (no-till corn with partial residue removal) or temporary (perennial herbaceous crops) net C loss to the atmosphere. This has a significant implications for global climate change mitigation where biomass production from annual and perennial crops is promoted to avoid fossil-fuel C emissions (biofuel) or to remove CO2 from the atmosphere (bioenergy C capture and storage). | |
dc.description.peerreviewed | Yes | |
dc.language | English | |
dc.language.iso | eng | |
dc.publisher | Elsevier Science | |
dc.relation.ispartofpagefrom | 151 | |
dc.relation.ispartofpageto | 160 | |
dc.relation.ispartofjournal | AGRICULTURAL AND FOREST METEOROLOGY | |
dc.relation.ispartofvolume | 253 | |
dc.subject.fieldofresearch | Earth sciences | |
dc.subject.fieldofresearch | Biological sciences | |
dc.subject.fieldofresearch | Agricultural, veterinary and food sciences | |
dc.subject.fieldofresearchcode | 37 | |
dc.subject.fieldofresearchcode | 31 | |
dc.subject.fieldofresearchcode | 30 | |
dc.title | Ecosystem carbon exchange on conversion of Conservation Reserve Program grasslands to annual and perennial cropping systems | |
dc.type | Journal article | |
dc.type.description | C1 - Articles | |
dc.type.code | C - Journal Articles | |
dcterms.license | https://creativecommons.org/licenses/by-nc-nd/4.0/ | |
dc.description.version | Version of Record (VoR) | |
gro.rights.copyright | © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license. This is an open access article distributed under the CC BY-NC-ND license, which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited. | |
gro.hasfulltext | Full Text | |
gro.griffith.author | Hamilton, Stephen K. | |