5fe15db04d8c1e58738c22375fa3a010  remsen_a2015v7p9122.pdf
ea17b0ed10df83d5f9cb1e71b9b7e0e135467ecb  remsen_a2015v7p9122.pdf
ef4bb53722d4451f6f6771f4c2dfe94fe9d60d7024918d80ef86b563b08f6a7c  remsen_a2015v7p9122.pdf

Title:          Fodder Biomass Monitoring in Sahelian Rangelands Using Phenological Metrics from FAPAR Time Series
Subject:        Timely monitoring of plant biomass is critical for the management of forage resources in Sahelian rangelands. The estimation of annual biomass production in the Sahel is based on a simple relationship between satellite annual Normalized Difference Vegetation Index (NDVI) and in situ biomass data. This study proposes a new methodology using multi-linear models between phenological metrics from the SPOT-VEGETATION time series of Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) and in situ biomass. A model with three variables—large seasonal integral (LINTG), length of growing season, and end of season decreasing rate—performed best (MAE = 605 kg·DM/ha; R2 = 0.68) across Sahelian ecosystems in Senegal (data for the period 1999–2013). A model with annual maximum (PEAK) and start date of season showed similar performances (MAE = 625 kg·DM/ha; R2 = 0.64), allowing a timely estimation of forage availability. The subdivision of the study area in ecoregions increased overall accuracy (MAE = 489.21 kg·DM/ha; R2 = 0.77), indicating that a relation between metrics and ecosystem properties exists. LINTG was the main explanatory variable for woody rangelands with high leaf biomass, whereas for areas dominated by herbaceous vegetation, it was the PEAK metric. The proposed approach outperformed the established biomass NDVI-based product (MAE = 818 kg·DM/ha and R2 = 0.51) and should improve the operational monitoring of forage resources in Sahelian rangelands.
Keywords:       fodder biomass; FAPAR; phenological metrics; ecoregion; food security; models; Sahel
Author:         Abdoul Aziz Diouf , Martin Brandt , Aleixandre Verger , Moussa El Jarroudi , Bakary Djaby , Rasmus Fensholt , Jacques André Ndione, Bernard Tychon
Creator:        Microsoft® Word 2013
Producer:       Microsoft® Word 2013
CreationDate:   Wed Jul 22 08:32:28 2015
ModDate:        Wed Feb 10 15:13:51 2016
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Pages:          27
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Page size:      595.32 x 841.92 pts (A4)
File size:      1578622 bytes
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Jhove (Rel. 1.6, 2011-01-04)
 Date: 2016-02-12 07:37:18 GMT+01:00
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