Abstract :
[en] The assessment of rangeland productivity in semi-extensively grazed arid rangelands is a prerequisite for livestock
management in relation to sustainable use of pastoral resources. The objective of this study was to assess
rangeland productivity based on normalised difference vegetation index (NDVI) images. Data on phytomass were
measured on 61 field samples in arid rangelands of Morocco, covering various rangeland categories during autumn
(November) and spring (April), i.e. when phytomass is at low and high levels, respectively, for two consecutive
years (2008 and 2009). Dekadal EROS Moderate Resolution Imaging Spectroradiometer (eMODIS) NDVI data
were linearly regressed to field measurements for these four periods. Results show that phytomass values were
correlated with NDVI during spring, with R 2 and RMSE values of 0.82 and 0.3 t ha−1, respectively. This study
indicates there is a high potential for operational use of remotely sensed data to estimate rangeland phytomass of
semi-extensively grazed rangelands.
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