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- W95862637 abstract "Sand Fynbos in and around the City of Cape Town has beenreduced to fragments by urbanisation and agriculture. Furtherthreats include exotic plant species. Invasive Port Jackson(Acacia saligna) is a major threat and grasses, both indigenousand alien, appear to be an alternative state on some Sand Fynbossites. This study investigates if remote sensing can provideindicators for the rapid detection of vegetation state ofremaining vegetation fragments. Productivity of the vegetationin response to rainfall is determined with the EnhancedVegetation Index (EVI) at sites within or adjacent to the Cityof Cape Town which are of conservation interest. Terra MODISEVI data with a spatial resolution of 250 m and precipitationdata from 19 rainfall stations for the period 2000 – 2008 areanalysed. In January 2010, fieldwork was undertaken toinvestigate the state and composition of the local vegetation.EVI data are correlated with the rainfall data. Within the scopeof a flexible correlation, different lags of the reaction areanalysed. Residual trends (RESTREND), the difference be-tween observed EVI and the one predicted by precipitation, arecalculated. EVI response of Fynbos to rainfall is considerablylower than that of grasses or A. saligna, and grass response ishighly seasonal. A. saligna has a higher EVI than Fynbosvegetation and shows a higher rain-use efficiency. With thespecific characteristics of these indicators and the spectralsignature of A. saligna, i.e. its unique reflectance over thecourse of the year, its distribution can be estimated. Remotesensing shows promise as a suitable instrument to assess thestate of lowland fynbos fragments." @default.
- W95862637 created "2016-06-24" @default.
- W95862637 creator A5081160936 @default.
- W95862637 date "2011-01-01" @default.
- W95862637 modified "2023-09-26" @default.
- W95862637 title "Monitoring ecosystem health of Fynbos remnant vegetation in the City of Cape Town using remote sensing" @default.
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