Sammanfattning

Recent estimates show that one third of the world's land and water resources are highly or moderately degraded. Global economic losses from land degradation (LD) are as high as USD $10.6 trillion annually. These trends catalyzed a call for avoiding future LD, reducing ongoing LD, and reversing past LD, which has culminated in the adoption of Sustainable Development Goal (SDG) Target 15.3 which aims to achieve global land degradation neutrality (LDN) by 2030. The political momentum and increased body of scientific literature have led to calls for a 'new science of LDN' and highlighted the practical challenges of implementing LDN. The aim of the present study was to derive LDN soil organic carbon (SOC) stock baseline maps by comparing different digital soil mapping (DSM) methods and sampling densities in a case study (Otjozondjupa, Namibia) and evaluate each approach with respect to complexity, cost, and map accuracy. The mean absolute error (MAE) leveled off after 100 samples were included in the DSM models resulting in a cost tradeoff for additional soil sample collection. If capacity is sufficient, the random forest DSM method out-performed other methods, but the improvement from using this more complex method compared to interpolating the soil sample data by ordinary kriging was minimal. The lessons learned while developing the Otjozondjupa LDN SOC baseline provide valuable insights for others who are responsible for developing LDN baselines elsewhere.

Nyckelord

land degradation neutrality; sampling density; map accuracy; method complexity; soil organic carbon; Namibia

Publicerad i

Sustainability
2018, Volym: 10, nummer: 5, artikelnummer: 1610
Utgivare: MDPI

SLU författare

• Persson, Kristin

  • Institutionen för mark och miljö, Sveriges lantbruksuniversitet
    
  • Centro Internacional de Agricultura Tropical (CIAT)

• Söderström, Mats

  • Institutionen för mark och miljö, Sveriges lantbruksuniversitet
    
  • Centro Internacional de Agricultura Tropical

Globala målen

SDG15 Skydda, återställa och främja ett hållbart nyttjande av landbaserade ekosystem, hållbart bruka skogar, bekämpa ökenspridning, hejda och vrida tillbaka markförstöringen samt hejda förlusten av biologisk mångfald
SDG16 Främja fredliga och inkluderande samhällen för hållbar utveckling, tillhandahålla tillgång till rättvisa för alla samt bygga upp effektiva, och inkluderande institutioner med ansvarsutkrävande på alla nivåer


UKÄ forskningsämne

Markvetenskap


Publikationens identifierare

DOI: https://doi.org/10.3390/su10051610

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/95893