Niko E. C. Verhoest

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In the past decades, many studies on soil moisture retrieval from SAR demonstrated a poor correlation between the top layer soil moisture content and observed backscatter coefficients, which mainly has been attributed to difficulties involved in the parameterization of surface roughness. The present paper describes a theoretical study, performed on(More)
Radar-based surface soil moisture retrieval has been subject of intense research during the last decades. However, several difficulties hamper the operational estimation of soil moisture based on currently available spaceborne sensors. The main difficulty experienced so far results from the strong influence of other surface characteristics, mainly(More)
Remote sensing offers a cost efficient means for identifying and monitoring wetlands over a large area and at different moments in time. In this study, we aim at providing ecologically relevant information on characteristics of temporary and permanent isolated open water wetlands, obtained by standard techniques and relatively cheap imagery. The number,(More)
The objective of this study was to apply phospholipid fatty acid (PLFA)-based stable isotope probing to assess the temporal variation of active microorganisms associated with rhizosphere-C flow in a natural wetland. We applied 13CO2 pulse labeling at three different times throughout the vegetation period: spring (April), early summer (June), and early(More)
Radar remote sensing has shown its potential for retrieving soil moisture from bare soil surfaces. Since the backscattering process is also determined by the soil roughness , the characterisation of the roughness is crucial for an accurate soil moisture retrieval. However, several field experiments have shown a large variability of the roughness parameters.(More)