dc.contributor.advisor | Ghadiri, Hossein | |
dc.contributor.advisor | Chen, Chengrong | |
dc.contributor.author | Rezaei Rashti, Mehran | |
dc.date.accessioned | 2018-01-23T02:19:38Z | |
dc.date.available | 2018-01-23T02:19:38Z | |
dc.date.issued | 2015 | |
dc.identifier.doi | 10.25904/1912/2902 | |
dc.identifier.uri | http://hdl.handle.net/10072/365552 | |
dc.description.abstract | Agricultural manipulation of the soil nitrogen (N) cycle has caused a significant increase in nitrous oxide (N2O) emissions during the past five decades. Nitrous oxide is one of the major greenhouse gases with potent and long-lasting global warming effects [298 times higher than carbon dioxide (CO2) over a time period of 100 years]. The major biogenic processes responsible for N2O production in agricultural soils are identified as nitrification which is the oxidation of ammonium (NH4+) to nitrite (NO2-) and nitrate (NO3-) and denitrification that is the anaerobic reduction of NO2- and NO3- to gaseous nitric oxide (NO), N2O or N2. Although the current concentration of N2O in the atmosphere is relatively lower than other greenhouse gases, it is annually increasing at a rate of 0.25%. Vegetable cropping systems, a major agricultural activity worldwide, generally comprise intensive cultivation and high rates of N application. However, the N recovery from intensively cultivated vegetable fields is reported to be only 20 - 50% of the applied N fertiliser, suggesting large amounts of N loss from these fields. In Australia, horticulture represents less than 1% of land used for agriculture, but accounts for 6-12% of N fertiliser use in agriculture and its contribution to national N2O emissions is significant. | |
dc.language | English | |
dc.publisher | Griffith University | |
dc.publisher.place | Brisbane | |
dc.rights.copyright | The author owns the copyright in this thesis, unless stated otherwise. | |
dc.subject.keywords | N2O emissions | |
dc.subject.keywords | Nitrous oxide | |
dc.subject.keywords | Agricultural soils | |
dc.subject.keywords | Vegetable cropping systems | |
dc.title | Nitrous Oxide Emissions from Vegetable Cropping Systems | |
dc.type | Griffith thesis | |
gro.faculty | Science, Environment, Engineering and Technology | |
gro.rights.copyright | The author owns the copyright in this thesis, unless stated otherwise. | |
gro.hasfulltext | Full Text | |
dc.contributor.otheradvisor | Wang, Weijin | |
dc.contributor.otheradvisor | Moody, Philip | |
dc.rights.accessRights | Public | |
gro.identifier.gurtID | gu1444699816416 | |
gro.source.ADTshelfno | ADT0 | |
gro.source.GURTshelfno | GURT | |
gro.thesis.degreelevel | Thesis (PhD Doctorate) | |
gro.thesis.degreeprogram | Doctor of Philosophy (PhD) | |
gro.department | Griffith School of Environment | |
gro.griffith.author | Rezaei Rashti, Mehran | |