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Synthetic Aperture Radar has shown its large potential for retrieving soil moisture maps at regional scales. However, since the backscattered signal is determined by several surface characteristics, the retrieval of soil moisture is an ill-posed problem when using single configuration imagery. Unless accurate surface roughness parameter values are(More)
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)
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-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)
The aim of this study was to monitor long-term temporal and spatial groundwater NO(3) (-) removal efficiencies in different riparian zones via a limited number of sampling wells. Groundwater NO(3) (-) concentrations were measured fortnightly or monthly over a period of two years using transects of ground water sampling wells. Depending on the level of the(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)