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dc.contributor.authorThomas, Andrew David
dc.contributor.authorElliott, David R.
dc.contributor.authorDougill, Andrew John
dc.contributor.authorStringer, Lindsay Carman
dc.contributor.authorHoon, Stephen Robert
dc.contributor.authorSen, Robin
dc.date.accessioned2018-05-22T10:30:13Z
dc.date.available2018-05-22T10:30:13Z
dc.date.issued2018-02-24
dc.identifier.citationThomas, A. D. et al (2018) 'The influence of trees, shrubs, and grasses on microclimate, soil carbon, nitrogen, and CO2 efflux: Potential implications of shrub encroachment for Kalahari rangelands', Land Degradation & Developmentm DOI: 10.1002/ldr.2918en
dc.identifier.issn10853278
dc.identifier.doi10.1002/ldr.2918
dc.identifier.urihttp://hdl.handle.net/10545/622722
dc.description.abstractShrub encroachment is a well‐documented phenomenon affecting many of the world's drylands. The alteration of vegetation structure and species composition can lead to changes in local microclimate and soil properties which in turn affect carbon cycling. The objectives of this paper were to quantify differences in air temperatures, soil carbon, nitrogen, and CO2 efflux under trees (Vachellia erioloba), shrubs (Grewia flava), and annual and perennial grasses (Schmidtia kalahariensis and Eragrostis lehmanniana) collected over three seasons at a site in Kgalagadi District, Botswana, in order to determine the vegetation‐soil feedback mechanism affecting the carbon cycle. Air temperatures were logged continuously, and soil CO2 efflux was determined throughout the day and evening using closed respiration chambers and an infrared gas analyser. There were significant differences in soil carbon, total nitrogen, CO2 efflux, light, and temperatures beneath the canopies of trees, shrubs, and grasses. Daytime air temperatures beneath shrubs and trees were cooler compared with grass sites, particularly in summer months. Night‐time air temperatures under shrubs and trees were, however, warmer than at the grass sites. There was also significantly more soil carbon, nitrogen, and CO2 efflux under shrubs and trees compared with grasses. Although the differences observed in soils and microclimate may reinforce the competitive dominance of shrubs and present challenges to strategies designed to manage encroachment, they should not be viewed as entirely negative. Our findings highlight some of the dichotomies and challenges to be addressed before interventions aiming to bring about more sustainable land management can be implemented.
dc.description.sponsorshipResearch was funded by a Leverhulme Trust standard grant and a NERC facilities grant and conducted under Government of Botswana permit EWT8/36/4 VIII(4). Stringer was supported by the Wolfson Foundation and Royal Society in her position as a Royal Society Wolfson Research Merit Award holder.en
dc.language.isoenen
dc.publisherWileyen
dc.relation.urlhttp://doi.wiley.com/10.1002/ldr.2918en
dc.rightsArchived with thanks to Land Degradation & Developmenten
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectDrylanden
dc.subjectMicroclimateen
dc.subjectShrubsen
dc.subjectSoil‐vegetation feedbacksen
dc.subjectVegetationen
dc.subjectCarbon cycleen
dc.titleThe influence of trees, shrubs, and grasses on microclimate, soil carbon, nitrogen, and CO2 efflux: Potential implications of shrub encroachment for Kalahari rangelands.en
dc.typeArticleen
dc.contributor.departmentAberystwyth Universityen
dc.contributor.departmentUniversity of Derbyen
dc.contributor.departmentUniversity of Leedsen
dc.contributor.departmentManchester Metropolitan Universityen
dc.identifier.journalLand Degradation & Developmenten
dc.contributor.institutionDepartment of Geography and Earth Sciences; Aberystwyth University; Aberystwyth SY23 3DB UK
dc.contributor.institutionEnvironmental Sustainability Research Centre; University of Derby; Derby DE22 1GB UK
dc.contributor.institutionSchool of Earth and Environment; University of Leeds; Leeds LS2 9JT UK
dc.contributor.institutionSchool of Earth and Environment; University of Leeds; Leeds LS2 9JT UK
dc.contributor.institutionSchool of Science and the Environment; Manchester Metropolitan University; Manchester M1 5GD UK
dc.contributor.institutionSchool of Science and the Environment; Manchester Metropolitan University; Manchester M1 5GD UK
dcterms.dateAccepted2018-02-15
refterms.dateFOA2019-02-28T17:07:14Z
html.description.abstractShrub encroachment is a well‐documented phenomenon affecting many of the world's drylands. The alteration of vegetation structure and species composition can lead to changes in local microclimate and soil properties which in turn affect carbon cycling. The objectives of this paper were to quantify differences in air temperatures, soil carbon, nitrogen, and CO2 efflux under trees (Vachellia erioloba), shrubs (Grewia flava), and annual and perennial grasses (Schmidtia kalahariensis and Eragrostis lehmanniana) collected over three seasons at a site in Kgalagadi District, Botswana, in order to determine the vegetation‐soil feedback mechanism affecting the carbon cycle. Air temperatures were logged continuously, and soil CO2 efflux was determined throughout the day and evening using closed respiration chambers and an infrared gas analyser. There were significant differences in soil carbon, total nitrogen, CO2 efflux, light, and temperatures beneath the canopies of trees, shrubs, and grasses. Daytime air temperatures beneath shrubs and trees were cooler compared with grass sites, particularly in summer months. Night‐time air temperatures under shrubs and trees were, however, warmer than at the grass sites. There was also significantly more soil carbon, nitrogen, and CO2 efflux under shrubs and trees compared with grasses. Although the differences observed in soils and microclimate may reinforce the competitive dominance of shrubs and present challenges to strategies designed to manage encroachment, they should not be viewed as entirely negative. Our findings highlight some of the dichotomies and challenges to be addressed before interventions aiming to bring about more sustainable land management can be implemented.


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