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  • Morel, Alexandra C.University of Oxford,Zoological Society of London (författare)

Carbon dynamics, net primary productivity and human-appropriated net primary productivity across a forest–cocoa farm landscape in West Africa

  • Artikel/kapitelEngelska2019

Förlag, utgivningsår, omfång ...

  • 2019-06-06
  • Wiley,2019

Nummerbeteckningar

  • LIBRIS-ID:oai:lup.lub.lu.se:b45a2e6b-9a9f-439c-ace9-6a6ec77a3f43
  • https://lup.lub.lu.se/record/b45a2e6b-9a9f-439c-ace9-6a6ec77a3f43URI
  • https://doi.org/10.1111/gcb.14661DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:art swepub-publicationtype
  • Ämneskategori:ref swepub-contenttype

Anmärkningar

  • Terrestrial net primary productivity (NPP) is an important metric of ecosystem functioning; however, there are little empirical data on the NPP of human-modified ecosystems, particularly smallholder, perennial crops like cocoa (Theobroma cacao), which are extensive across the tropics. Human-appropriated NPP (HANPP) is a measure of the proportion of a natural system's NPP that has either been reduced through land-use change or harvested directly and, previously, has been calculated to estimate the scale of the human impact on the biosphere. Additionally, human modification can create shifts in NPP allocation and decomposition, with concomitant impacts on the carbon cycle. This study presents the results of 3 years of intensive monitoring of forest and smallholder cocoa farms across disturbance, management intensity, distance from forest and farm age gradients. We measured among the highest reported NPP values in tropical forest, 17.57 ± 2.1 and 17.7 ± 1.6 Mg C ha−1 year−1 for intact and logged forest, respectively; however, the average NPP of cocoa farms was still higher, 18.8 ± 2.5 Mg C ha−1 year−1, which we found was driven by cocoa pod production. We found a dramatic shift in litterfall residence times, where cocoa leaves decomposed more slowly than forest leaves and shade tree litterfall decomposed considerably faster, indicating significant changes in rates of nutrient cycling. The average HANPP value for all cocoa farms was 2.1 ± 1.1 Mg C ha−1 year−1; however, depending on the density of shade trees, it ranged from −4.6 to 5.2 Mg C ha−1 year−1. Therefore, rather than being related to cocoa yield, HANPP was reduced by maintaining higher shade levels. Across our monitored farms, 18.9% of farm NPP was harvested (i.e., whole cocoa pods) and only 1.1% (i.e., cocoa beans) was removed from the system, suggesting that the scale of HANPP in smallholder cocoa agroforestry systems is relatively small.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Adu Sasu, MichaelNature Conservation Research Centre (NCRC Ghana) (författare)
  • Adu-Bredu, StephenForestry Research Institute of Ghana (FORIG) (författare)
  • Quaye, MarvinNature Conservation Research Centre (NCRC Ghana) (författare)
  • Moore, ChristineUniversity of Oxford (författare)
  • Ashley Asare, RebeccaNature Conservation Research Centre (NCRC Ghana) (författare)
  • Mason, JohnNature Conservation Research Centre (NCRC Ghana) (författare)
  • Hirons, MarkUniversity of Oxford (författare)
  • McDermott, Constance L.University of Oxford (författare)
  • Robinson, Elizabeth J.Z.University of Reading (författare)
  • Boyd, EmilyLund University,Lunds universitet,LUCSUS,Samhällsvetenskapliga institutioner och centrumbildningar,Samhällsvetenskapliga fakulteten,LUCSUS (Lund University Centre for Sustainability Studies),Departments of Administrative, Economic and Social Sciences,Faculty of Social Sciences(Swepub:lu)em6237bo (författare)
  • Norris, KenZoological Society of London (författare)
  • Malhi, YadvinderUniversity of Oxford (författare)
  • University of OxfordZoological Society of London (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Global Change Biology: Wiley25:8, s. 2661-26771354-10131365-2486

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