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Browsing by Subject "Phenology"

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Investigating the relationship between tree species diversity and landsat-8 spectral heterogeneity across multiple phenological stages

Author: Madonsela, Sabelo ; Cho, Moses A ; Ramoelo, Abel ; Mutanga, O Date: Jun 2021 The emergence of the spectral variation hypothesis (SVH) has gained widespread attention in the remote sensing community as a method for deriving biodiversity information from remotely sensed data. SVH states that spectral heterogeneity on ... Read more
Long-term phenology and variability of Southern Africa

Author: Steenkamp, Karen C ; Wessels, Konrad J ; Archibald, S ; Von Maltitz, Graham P Date: Nov 2008 Satellite-derived phenology allows monitoring of terrestrial vegetation on a global scale and provides an integrative view at the landscape level. Understanding these seasonal phenological patterns is essential to (i) the characterisation and ... Read more
Long-term trends in vegetation phenology and productivity over Namaqualand using the GIMMS AVHRR NDVI3g data from 1982 to 2011

Author: Davis, CL ; Hoffman, MT ; Roberts, W Date: Jul 2017 Vegetation monitoring of arid and semi-arid environments using remotely sensed vegetation indices over long periods of time is essential to improve the understanding of the processes related to change. In this paper, 30 years of biweekly AVHRR ... Read more
Multi-phenology WorldView-2 imagery improves remote sensing of savannah tree species

Author: Madonsela, Sabelo ; Cho, Moses A ; Mathieu, Renaud SA ; Mutanga, O ; Ramoelo, Abel ; Kaszta, Z ; Van De Kerchove, R ; Wolff, E Date: Jun 2017 Biodiversity mapping in African savannah is important for monitoring changes and ensuring sustainable use of ecosystem resources. Biodiversity mapping can benefit from multi-spectral instruments such as WorldView-2 with very high spatial ... Read more
Nutrient and secondary metabolite concentrations in a savanna are independently affected by large herbivores and shoot growth rate

Author: Scogings, PF ; Hjalten, J ; Skarpe, C ; Hattas, D ; Zobolo, A ; Dziba, L ; Rooke, T Date: Jan 2014 Carbon-based secondary metabolites (CBSMs) such as tannins are assumed to function as plant defences against herbivores. CBSMs are thought to be inversely related to growth rate and nutrient concentrations because a physiological trade-off ... Read more
Phenology and environmental control of phytoplankton blooms in the Kong Håkon VII Hav in the Southern Ocean

Author: Kauko, HM ; Hattermann, T ; Ryan-Keogh, Thomas J ; Singh, Asmita ; De Steur, L ; Fransson, A ; Chierici, M ; Falkenhaug, T ; Hallfredsson, EH ; Bratbak, G Date: Mar 2021 Knowing the magnitude and timing of pelagic primary production is important for ecosystem and carbon sequestration studies, in addition to providing basic understanding of phytoplankton functioning. In this study we use data from an ecosystem ... Read more
Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean

Author: Kauko, HM ; Hattermann, T ; Ryan-Keogh, Thomas J ; Singh, Asmita ; De Steur, L ; Fransson, A ; Chierici, M ; Falkenhaug, T ; Hallfredsson, EH ; Bratbak, G Date: Mar 2021 Knowing the magnitude and timing of pelagic primary production is important for ecosystem and carbon sequestration studies, in addition to providing basic understanding of phytoplankton functioning. In this study we use data from an ecosystem ... Read more
Remotely sensed phenology for mapping biomes and vegetation functional types

Author: Wessels, Konrad J ; Steenkamp, Karen C ; Von Maltitz, Graham P ; Archibald, S ; Scholes, RJ ; Miteff, S ; Bachoo, A Date: Jul 2009 This study used remotely-sensed phenology data derived from Advanced Very High Resolution Radiometer (AVHRR), in a fully supervised decision-tree classification based on the new biome map of South Africa. The objectives were: (i) to investigate ... Read more
Remotely sensed vegetation phenology for describing and predicting the biomes of South Africa

Author: Wessels, Konrad J ; Steenkamp, Karen C ; Von Maltitz, Graham P ; Archibald, S Date: Feb 2011 What are the patterns of remotely sensed vegetation phenology, including their inter-annual variability, across South Africa? What are the phenological attributes that contribute most to distinguishing the different biomes? How well can the ... Read more
Seasonal variations in nutrients and secondary metabolites in semi-arid savannas depend on year and species

Author: Scogings, PF ; Hattas, D ; Skarpe, C ; Hjältén, J ; Dziba, L ; Zobolo, A ; Rooke, T Date: Mar 2015 Semi-arid savannas are characterised by alternating wet and dry seasons and large inter-annual rainfall fluctuations that affect plant growth. Carbon-based secondary metabolites (CBSMs) vary inversely with growth and nutrients because of the ... Read more
Spectral variability within species and its effects on savanna tree species discrimination

Author: Cho, Moses A ; Debba, Pravesh ; Mathieu, Renaud SA ; Van Aardt, J ; Asner, G ; Naidoo, Laven ; Main, Russell S Date: Jul 2009 Differences in within-species phenology and structure driven by factors including topography, edaphic properties, and climatic variables present important challenges for species differentiation with remote sensing in the Kruger National Park, ... Read more

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Browsing by Subject "Phenology"

Browsing by Subject "Phenology"

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