研究目的
To analyze the time, polarization, and angle dependency of the vegetation optical depth (τ), the relationship between the radiometer-derived τ and several vegetation properties measured in situ over a full vegetation cycle, and the impact of the quality of the τ parameter on the soil moisture retrieval.
研究成果
The study demonstrated the importance of using a time, polarization, and angle dependent τ parameter for accurate soil moisture retrieval. It also showed the potential of using τ information for vegetation property monitoring.
研究不足
The study is limited to a specific type of vegetation (winter wheat and white mustard) and a specific location (Selhausen remote sensing field laboratory, Germany). The findings may not be directly applicable to other vegetation types or locations without further research.
1：Experimental Design and Method Selection:
Tower-based L-band radiometer observations were performed over the entire growing season of a winter wheat stand. Measurements were taken over two footprint types within the same crop stand (gridded plot: soil covered by a reflector with the vegetation growing through; and non-gridded plot: soil covered by the vegetation only) using different incidence angles.
2：Sample Selection and Data Sources:
The experiment was performed at the Selhausen remote sensing field laboratory (Germany), with an experimental plot of
3：05 ha. List of Experimental Equipment and Materials:
L-band passive microwave remote sensing measurements were performed with the ELBARA-II radiometer at a frequency of
4：4 GHz. In situ sensors were installed to monitor the soil relative dielectric permittivity, the soil temperature, and the vegetation canopy temperature. Experimental Procedures and Operational Workflow:
TB measurements were repeated twice a week at incidence angles ranging between 40° and 60° in increments of 5° above the non-gridded and gridded plots.
5：Data Analysis Methods:
The τ-ω radiative transfer model was used to invert the brightness temperature (TB) measured over the gridded plot to retrieve τ. The TB measurements over the non-gridded plot were inverted to retrieve the volumetric water content of the soil (SWC).
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LI-3000 C Area Meter
Area meter
Li-COR
Measuring leaf area index (LAI)
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ELBARA-II
L-band radiometer
Forschungszentrum Jülich GmbH
Performing L-band passive microwave remote sensing measurements
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5TM/TE
Capacitance sensors
Decagon Devices
Measuring soil relative dielectric permittivity and soil temperature
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ECH20 Em50
Data logger
Decagon Devices
Logging data from soil sensors
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TDR100
Time-domain reflectometry sensor
Campbell Scientific
Measuring soil relative dielectric permittivity
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CR1000
Data logger
Campbell Scientific
Logging data from TDR sensors
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Pt100
Temperature sensors
Measuring air temperature within the vegetation canopy
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DT85
Data logger
COSINUS Messtechnik GmbH
Logging data from temperature sensors
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