The influence of trees, shrubs, and grasses on microclimate, soil carbon, nitrogen, and CO2 efflux: Potential implications of shrub encroachment for Kalahari rangelands.
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Thomas_et_al-2017-Land_Degrada ...
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Authors
Thomas, Andrew David
Elliott, David R.

Dougill, Andrew John

Stringer, Lindsay Carman

Hoon, Stephen Robert
Sen, Robin

Affiliation
Aberystwyth UniversityUniversity of Derby
University of Leeds
Manchester Metropolitan University
Issue Date
2018-02-24
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Shrub 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.Citation
Thomas, 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.2918Publisher
WileyJournal
Land Degradation & DevelopmentDOI
10.1002/ldr.2918Additional Links
http://doi.wiley.com/10.1002/ldr.2918Type
ArticleLanguage
enISSN
10853278ae974a485f413a2113503eed53cd6c53
10.1002/ldr.2918
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