Land use effects on soil microbial carbon and nitrogen in riparian zones of Northeast Missouri

dc.contributor.author Haake, Danelle
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2020-08-05T18:36:51.000
dc.date.accessioned 2021-02-26T08:42:44Z
dc.date.available 2021-02-26T08:42:44Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 2003
dc.date.issued 2003-01-01
dc.description.abstract <p>In the agricultural centers of the world, soil quality is a widely studied topic. This study focuses on two microbial aspects of soil quality within the riparian zone as affected by land use: soil microbial biomass (SMB) and the mineralization/immobilization of nitrogen. The soils in question were collected on six different dates over a two-year period from riparian forests, pastures, and crop fields along three streams in the Mark Twain Reservoir watershed in northeastern Missouri (Monroe County). SMB was determined in soils up to 110 cm depth using chloroform fumigation-extraction. Surface soil (0-15 cm) under pasture and forest contained 35% and 28% more SMB, respectively, than was found under crop. SMB carbon was at its lowest during the summer, most likely due to a combination of climatic variables. Depth had a highly significant effect (P<0.001), with 50-75% of the total SMB at a site found in the top 35 cm of soil. Aerobic soil incubations were used to determine changes in soil inorganic nitrogen over two-week periods. Land use had little effect on levels of inorganic nitrogen in the soil or on rates of N mineralization. As soil depth increased, soil N concentrations and mineralization rates dropped. Mineralization rates in surface soil were approximately 1.8 mg N wk−1 kg−1 dry soil while about 0.2 mg N wk−1 kg−1 dry soil was immobilized in the deepest depth sampled (65-80 cm). Additions of labile C or N during the incubations seem to show that N immobilization is limited by lack of C for these soils, particularly in the surface soils.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/19983/
dc.identifier.articleid 20982
dc.identifier.contextkey 18780122
dc.identifier.doi https://doi.org/10.31274/rtd-20200803-205
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/19983
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/97350
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/19983/Haake_ISU_2003_H32.pdf|||Fri Jan 14 22:01:32 UTC 2022
dc.subject.keywords Natural resource ecology and management
dc.subject.keywords Water resources
dc.title Land use effects on soil microbial carbon and nitrogen in riparian zones of Northeast Missouri
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
thesis.degree.discipline Water Resources
thesis.degree.level thesis
thesis.degree.name Master of Science
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