Show simple item record

dc.contributor.authorLee, Juhwan
dc.contributor.authorGarland, G.
dc.contributor.authorViscarra Rossel, Raphael
dc.date.accessioned2019-05-28T02:51:06Z
dc.date.available2019-05-28T02:51:06Z
dc.date.issued2018
dc.identifier.citationLee, J. and Garland, G.M. and Viscarra Rossel, R.A. 2018. Continental soil drivers of ammonium and nitrate in Australia. SOIL. 4 (3): pp. 213-224.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/75588
dc.identifier.doi10.5194/soil-4-213-2018
dc.description.abstract

Soil N is an essential element for plant growth, but its mineral forms are subject to loss from the environment by leaching and gaseous emissions. Despite its importance for the soil-plant system, factors controlling soil mineral N contents over large spatial scales are not well understood. We used and contents (0–30 cm depth) from 469 sites across Australia and determined soil controls on their regional variation. Soil mineral N varied regionally but depended on the different land uses. In the agricultural region of Australia, tended to be similar (median 4.0 vs. 3.5 mg N kg−1) and was significantly enriched (3.0 vs. 1.0 mg N kg−1), compared to the non-agricultural region. The importance of soil controls on mineral N in the agricultural region, identified by the model trees algorithm Cubist, showed that was affected by total N, cation exchange capacity (CEC) and pH. In the non-agricultural region, was affected not only by CEC and pH, but also by organic C and total P. In each of the regions, was primarily affected by CEC, with more complex biophysical controls. In both regions, correlations between mineral N and soil C : N : P stoichiometry suggest that more was found in P-depleted soil relative to total C and total N. However, our results showed that only in the non-agricultural region was sensitive to the state of C and its interaction with N and P. The models helped to explain 36 %–68 % of regional variation in mineral N. Although soil controls on high N contents were highly uncertain, we found that region-specific interactions of soil properties control mineral N contents. It is therefore essential to understand how they alter soil mechanisms and N cycling at large scales.

dc.languageEnglish
dc.publisherCOPERNICUS GESELLSCHAFT MBH
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectScience & Technology
dc.subjectLife Sciences & Biomedicine
dc.subjectSoil Science
dc.subjectAgriculture
dc.subjectMINERAL NITROGEN
dc.subjectORGANIC-MATTER
dc.subjectCARBON
dc.subjectECOSYSTEMS
dc.subjectMANAGEMENT
dc.subjectNUTRITION
dc.subjectRESPONSES
dc.subjectECOLOGY
dc.subjectCYCLE
dc.subjectN2O
dc.titleContinental soil drivers of ammonium and nitrate in Australia
dc.typeJournal Article
dcterms.source.volume4
dcterms.source.number3
dcterms.source.startPage213
dcterms.source.endPage224
dcterms.source.issn2199-3971
dcterms.source.titleSOIL
dc.date.updated2019-05-28T02:51:04Z
curtin.departmentSchool of Molecular and Life Sciences (MLS)
curtin.accessStatusOpen access
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidViscarra Rossel, Raphael [0000-0003-1540-4748]
curtin.contributor.orcidLee, Juhwan [0000-0002-7967-2955]
dcterms.source.eissn2199-398X
curtin.contributor.scopusauthoridViscarra Rossel, Raphael [55900800400]
curtin.contributor.scopusauthoridLee, Juhwan [13411067500]


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record

http://creativecommons.org/licenses/by/4.0/
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by/4.0/