Review and meta-analysis of organic matter in cultivated soils in southern Africa

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dc.contributor.author Swanepoel, C.M.
dc.contributor.author Van der Laan, Michael
dc.contributor.author Weepener, H.L.
dc.contributor.author Du Preez, C.C.
dc.contributor.author Annandale, J.G. (John George), 1959-
dc.date.accessioned 2016-02-25T07:25:26Z
dc.date.issued 2016-01
dc.description.abstract Soil organic matter (SOM) is tightly linked to soil quality, but cultivation generally causes a decline in SOM, reducing soil quality and releasing carbon dioxide into the atmosphere. Internationally, countries are expected to reduce their greenhouse gas (GHG) emissions, and compile and update GHG inventories. Many developing countries, such as those in southern Africa, do not have reliable information regarding SOM levels in cultivated soils, changes over time and best management practices to maintain or even restore SOM. A review was conducted to collate published research on SOM [or its indicator elements, carbon (C) and nitrogen (N)] in cultivated fields in southern Africa. A total of 84 publications were assessed, and information such as date, location, SOM/soil organic carbon (SOC) and clay content and key findings were recorded. Most of the publications (90 %) were published post-1990. The spatial distribution of these studies is very non-uniform. A decline of 25–53 % in SOC due to cultivation was evident for cultivated fields in different precipitation zones in southern Africa, with SOC ranging from 0.7 to 2.5 %. These values correlate relatively well with existing SOC maps. A strong correlation between SOC and clay content in natural soil is weakened following cultivation. Carbon sequestration and GHG emission dynamics under various management systems and for different climatic regions, as well as how field crop production can play a role in mitigating climate change, are poorly understood. Intensified monitoring by multi-institutional collaboration is recommended to address this issue. en_ZA
dc.description.embargo 2017-01-29
dc.description.librarian hb2015 en_ZA
dc.description.sponsorship ARC and the Water Research Commission (Project K5/2501). en_ZA
dc.description.uri http://link.springer.com/journal/10705 en_ZA
dc.identifier.citation Swanepoel, CM, Van der Laan, M, Weepener, HL, Du Preez, CC, Annandale, JG 2016, 'Review and meta-analysis of organic matter in cultivated soils in southern Africa', Nutrient Cycling in Agroecosystems, NYP. en_ZA
dc.identifier.issn 1385-1314 (print)
dc.identifier.issn 1573-0867 (online)
dc.identifier.other 10.1007/s10705-016-9763-4
dc.identifier.uri http://hdl.handle.net/2263/51545
dc.language.iso en en_ZA
dc.publisher Springer en_ZA
dc.rights © Springer Science+Business Media Dordrecht 2016. The original publication is available at : http://link.springer.comjournal/10705. en_ZA
dc.subject Agriculture en_ZA
dc.subject Carbon sequestration en_ZA
dc.subject Clay en_ZA
dc.subject Greenhouse gas (GHG) en_ZA
dc.subject Nitrogen en_ZA
dc.subject Nitrous oxide en_ZA
dc.subject Soil organic matter (SOM) en_ZA
dc.title Review and meta-analysis of organic matter in cultivated soils in southern Africa en_ZA
dc.type Postprint Article en_ZA


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