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Article

Monitoring Large-Scale Restoration Interventions from Land Preparation to Biomass Growth in the Sahel

Food and Agriculture Organization of the United Nations, Forestry Division, 00153 Rome, Italy
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Author to whom correspondence should be addressed.
Academic Editor: Keith T. Weber
Remote Sens. 2021, 13(18), 3767; https://doi.org/10.3390/rs13183767
Received: 27 July 2021 / Revised: 14 September 2021 / Accepted: 16 September 2021 / Published: 20 September 2021
In this work we demonstrate that restoration interventions in arid to semi-arid landscapes can be independently assessed by remote sensing methods throughout all phases. For early verification, we use Sentinel-1 radar imagery that is sensitive to changes in soil roughness and thus able to rapidly detect disturbances due to mechanised ploughing, including identification of the time of occurrence and the surface area prepared for planting. Subsequently, time series of the normalized difference vegetation index (NDVI) derived from high-resolution imagery enabled tracking and verifying of the increase in biomass and the long-term impact of restoration interventions. We assessed 111 plots within the Great Green Wall area in Burkina Faso, Niger, Nigeria and Senegal. For 58 plots, the interventions were successfully verified, corresponding to an area of more than 7000 ha of degraded land. Comparatively, these computerised data were matched with field data and high-resolution imagery, for which the NDVI was used as an indicator of subsequent biomass growth in the plots. The trends were polynomial and presented clear vegetation gains for the monthly aggregates over the last 2 years (2018–2020). The qualitative data on planted species also showed an increase in biodiversity as direct sown seeds of a minimum of 10 native Sahel species (six woody mixed with four fodder herbaceous species) were planted per hectare. This innovative and standardised monitoring method provides an objective and timely assessment of restoration interventions and will likely appeal more actors to confidently invest in restoration as a part of zero-net climate mitigation. View Full-Text
Keywords: restoration interventions; independent assessment; Great Green Wall; Sahel; remote sensing restoration interventions; independent assessment; Great Green Wall; Sahel; remote sensing
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MDPI and ACS Style

Sacande, M.; Martucci, A.; Vollrath, A. Monitoring Large-Scale Restoration Interventions from Land Preparation to Biomass Growth in the Sahel. Remote Sens. 2021, 13, 3767. https://doi.org/10.3390/rs13183767

AMA Style

Sacande M, Martucci A, Vollrath A. Monitoring Large-Scale Restoration Interventions from Land Preparation to Biomass Growth in the Sahel. Remote Sensing. 2021; 13(18):3767. https://doi.org/10.3390/rs13183767

Chicago/Turabian Style

Sacande, Moctar, Antonio Martucci, and Andreas Vollrath. 2021. "Monitoring Large-Scale Restoration Interventions from Land Preparation to Biomass Growth in the Sahel" Remote Sensing 13, no. 18: 3767. https://doi.org/10.3390/rs13183767

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