Effect of management on rangeland phytomass, cover and condition in two biomes in South Africa

Oomen, Roelof; Linstädter, Anja; Ruppert, Jan C.; Brüser, Katharina; Schellberg, Jürgen; Ewert, Frank

doi:10.2989/10220119.2016.1218368

Cited by 5 publications

(1 citation statement)

References 54 publications

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“…Thus, understanding how variable environmental conditions drive forage provision is a critical step towards designing sustainable land-use practices. Main drivers causing variation in space are abiotic factors such as topoedaphic conditions or climate, and biotic factors such as grazing pressure (Guuroh et al, 2018;Oomen et al, 2016). Variation in time is generally caused by the vegetation's phenological development, by variable weather conditions, and by management decisions (Berger et al, 2019;Brüser et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Towards Forage Resource Monitoring in subtropical Savanna Grasslands: going multispectral or hyperspectral?

Ferner

Linstädter

Rogaß

et al. 2021

European Journal of Remote Sensing

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Forage supply of savanna grasslands plays a crucial role for local food security and consequently, a reliable monitoring system could help to better manage vital forage resources. To help installing such a monitoring system, we investigated whether in-situ hyperspectral data could be resampled to match the spectral resolution of multi-and hyperspectral satellites; if the type of sensor affected model transfer; and if spatio-temporal patterns of forage characteristics could be related to environmental drivers. We established models for forage quantity (green biomass) and five forage quality proxies (metabolisable energy, acid/neutral detergent fibre, ash, phosphorus). Hyperspectral resolution of the Hyperion satellite mostly resulted in higher accuracies (i.e. higher R 2 , lower RMSE). When applied to satellite data, though, the greater quality of the multispectral Sentinel-2 satellite data leads to more realistic forage maps. By analysing a three-year time series, we found plant phenology and cumulated precipitation to be the most important environmental drivers of forage supply. We conclude that none of the investigated satellites provide optimal conditions for monitoring purposes. Future hyperspectral satellite missions like EnMAP, combining the high information level of Hyperion with the good data quality and resolution of Sentinel-2, will provide the prerequisites for installing a regular monitoring service.

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