| Attribute Name -- Attribute Label |
Unit |
Attribute definition |
Datetime
--
Date and Time
|
not mapped |
This is the date and time of the observation |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
HarvestTime |
|
Description
:
|
The Datetime is recorded as the harvest date and time (two times each year). |
|
|
BY_T_A1
--
Total Biomass in A1
|
Gram per square meter |
This attribute denotes the total biomass in Ring A1. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
BiomassYield |
|
Description
:
|
Weight of total aboveground dry biomass - 3d 105°C |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Drying Cabient, Type: ###
|
Vendor: Hereaus
|
|
|
|
BY_T_A2
--
Total Biomass in A2
|
Gram per square meter |
This attribute denotes the total biomass in Ring A2. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
BiomassYield |
|
Description
:
|
Weight of total aboveground dry biomass - 3d 105°C |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Drying Cabient, Type: ###
|
Vendor: Hereaus
|
|
|
|
BY_T_A3
--
Total Biomass in A3
|
Gram per square meter |
This attribute denotes the total biomass in Ring A3. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
BiomassYield |
|
Description
:
|
Weight of total aboveground dry biomass - 3d 105°C |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Drying Cabient, Type: ###
|
Vendor: Hereaus
|
|
|
|
BY_T_E1
--
Total Biomass in E1
|
Gram per square meter |
This attribute denotes the total biomass in Ring E1. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
BiomassYield |
|
Description
:
|
Weight of total aboveground dry biomass - 3d 105°C |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Drying Cabient, Type: ###
|
Vendor: Hereaus
|
|
|
|
BY_T_E2
--
Total Biomass in E2
|
Gram per square meter |
This attribute denotes the total biomass in Ring E2. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
BiomassYield |
|
Description
:
|
Weight of total aboveground dry biomass - 3d 105°C |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Drying Cabient, Type: ###
|
Vendor: Hereaus
|
|
|
|
BY_T_E3
--
Total Biomass in E3
|
Gram per square meter |
This attribute denotes the total biomass in Ring E3. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
BiomassYield |
|
Description
:
|
Weight of total aboveground dry biomass - 3d 105°C |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Drying Cabient, Type: ###
|
Vendor: Hereaus
|
|
|
|
CO2_3Months_A1
--
CO2 Conc averaged 3months before H2 in A1
|
Parts per million |
This attribute denotes the averaged CO2 concentration within the ring three months before harvest measured with an infrared gas analyser (LI-COR 6252) at an hourly interval in the centre of the ring at 60 cm above ground. (A1) |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
CO2 concentration in ring |
|
Description
:
|
CO2-concentration logged at an hourly interval in the centre of the ring at 60 cm above ground |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Infrared gas analyser
|
Vendor: LI-COR
|
|
|
|
CO2_3Months_A2
--
CO2 Conc averaged 3months before H2 in A2
|
Parts per million |
This attribute denotes the averaged CO2 concentration within the ring three months before harvest measured with an infrared gas analyser (LI-COR 6252) at an hourly interval in the centre of the ring at 60 cm above ground. (A2) |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
CO2 concentration in ring |
|
Description
:
|
CO2-concentration logged at an hourly interval in the centre of the ring at 60 cm above ground |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Infrared gas analyser
|
Vendor: LI-COR
|
|
|
|
CO2_3Months_A3
--
CO2 Conc averaged 3months before H2 in A3
|
Parts per million |
This attribute denotes the averaged CO2 concentration within the ring three months before harvest measured with an infrared gas analyser (LI-COR 6252) at an hourly interval in the centre of the ring at 60 cm above ground. (A3) |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
CO2 concentration in ring |
|
Description
:
|
CO2-concentration logged at an hourly interval in the centre of the ring at 60 cm above ground |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Infrared gas analyser
|
Vendor: LI-COR
|
|
|
|
CO2_3Months_E1
--
CO2 Conc averaged 3months before H2 in E1
|
Parts per million |
This attribute denotes the averaged CO2 concentration within the ring three months before harvest measured with an infrared gas analyser (LI-COR 6252) at an hourly interval in the centre of the ring at 60 cm above ground. (E1) |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
CO2 concentration in ring |
|
Description
:
|
CO2-concentration logged at an hourly interval in the centre of the ring at 60 cm above ground |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Infrared gas analyser
|
Vendor: LI-COR
|
|
|
|
CO2_3Months_E2
--
CO2 Conc averaged 3months before H2 in E2
|
Parts per million |
This attribute denotes the averaged CO2 concentration within the ring three months before harvest measured with an infrared gas analyser (LI-COR 6252) at an hourly interval in the centre of the ring at 60 cm above ground. (E2) |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
CO2 concentration in ring |
|
Description
:
|
CO2-concentration logged at an hourly interval in the centre of the ring at 60 cm above ground |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Infrared gas analyser
|
Vendor: LI-COR
|
|
|
|
CO2_3Months_E3
--
CO2 Conc averaged 3months before H2 in E3
|
Parts per million |
This attribute denotes the averaged CO2 concentration within the ring three months before harvest measured with an infrared gas analyser (LI-COR 6252) at an hourly interval in the centre of the ring at 60 cm above ground. (E3) |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
CO2 concentration in ring |
|
Description
:
|
CO2-concentration logged at an hourly interval in the centre of the ring at 60 cm above ground |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Infrared gas analyser
|
Vendor: LI-COR
|
|
|
|
PPT_Sum_3Months
--
Rainfall sum over the 3 months before H2
|
Millimeter |
This attribute denotes the rainfall sum in the three months before harvest, sum of half-hourly values of three Hellmann Samplers. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
Rainfall |
|
Description
:
|
measured at three randomly distributed locations at half-hourly intervals |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Hellmann sampler
|
Vendor: unknown
|
|
|
|
GWL_Mean_3Months
--
Mean groundwater table in the 3 months before H2
|
Centimeter |
This attribute denotes mean groundwater table in the three months before harvest, averaged from daily values of three gauges. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
Ground water level |
|
Description
:
|
measured at three locations |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Gauges
|
Vendor: unknown
|
|
|
|
VapDef_Mean_3Months
--
Mean vapour pressure deficit in the 3 months before H2
|
Kilopascal |
This attribute denotes mean vapour pressure deficit in the three months before harvest, derived by FAO formula, using half-hourly air temperature and relative air humidity data. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
Vapour Pressure Deficit |
|
Description
:
|
Calculated by means of the FAO formula using air temperature and relative air humidity.
* Allen, R.G., L.S. Pereira, D. Raes, and M. Smith. Crop Evapotranspiration: Guidelines for computing crop water requirements. Irrigation and Drainage Paper 56, Food and Agriculture Organization of the United Nations, Rome. (1998). |
|
|
SPEI_Mean_3Months
--
Mean SPEI in the 3 months before H2
|
Unitless |
This attribute denotes mean Standardised Precipitation Evapotranspiration Index (SPEI) in the three months before harvest. The SPEI is based on the climatic water balance defined by the total amount of precipitation minus evapotranspiration and was derived using the SPEI package (CRAN R). |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
Standardized Precipitation Evapotranspiration Index |
|
Description
:
|
The SPEI is a multi-scalar drought index based on the climatic water balance defined by the total amount of precipitation minus evapotranspiration. The SPEI package (CRAN R)* was used for its calculation. Essentially, the data are transformed to a Gaussian standard distribution with zero mean and a standard deviation of one, assuming a Log-logistic distribution and using probability weighted moments for parameter estimation. Thus, a self-calibrating and standardized index for a given location is obtained (negative values indicate dry conditions and positive values indicate wet conditions).
* Vicente-Serrano, S. M., Begueria, S. & Lopez-Moreno, J. I. A multiscalar drought index sensitive to global warming: The standardized precipitation evapotranspiration index.
Journal of Climate 23, 1696–1718 (2010). |
|
|
AT_Mean_3Months
--
Mean air temperature in the 3 months before H2
|
Degrees Celsius |
This attribute denotes mean air temperature in the three months before harvest, averaged from half-hourly measurements with a Pt-100 resistance thermometer at 2m height. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
Air temperature |
|
Description
:
|
Measured at 2m height and logged at an half-hourly interval |
|
Instrumentation:
|
Instrument:
Description: Resistance thermometer
|
Instrument: Pt-100
|
Vendor: unknown
|
|
|
|
SR_Sum_3Months
--
Sum of Solar radiation in the 3 months before H2
|
Megajoules per square meter |
This attribute denotes the sum of the solar radiation in the three months before harvest, averaged from half-hourly measurements with a pyranometer. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
Solar radiation |
|
Description
:
|
logged at an half-hourly interval. |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Pyranometer
|
Vendor: unknown
|
|
|
|
WND_Mean_3Months
--
Mean wind speed in the 3 months before H2
|
Meter per second |
This attribute denotes the mean wind speed in the three months before harvest, averaged from half-hourly measurements with a cup anemometer at 2m height. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
Wind speed |
|
Description
:
|
Wind speed measured at 2m height. |
|
Instrumentation:
|
Instrument:
Description:
|
Instrument: Cup anemometer
|
Vendor: unknown
|
|
|
|
PM_ET_Mean_3Months
--
Mean evapotranspiration for a homogenoeous grass canopy in the 3 months before H2
|
Millimeter |
This attribute denotes the mean evapotranspiration for a homogenoeous grass canopy in the three months before harvest, derived on a daily basis using the FAO formula, with the input variables daily minimum and maximum air temperature, daily mean wind speed, daily solar radiation sum and the mean daily vapour pressure. |
|
Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
|
|
--- Step
1
---
|
|
Title
:
|
Evapotranspiration |
|
Description
:
|
The evapotranspiration for a homogeneous grass canopy was estimated on a daily basis using the FAO Penman-Monteith method (FAO PM ET0)* implemented in the sirad package (CRAN R)**. The input variables were the daily minimum and maximum air temperature (°C), daily mean wind speed (m/s), daily solar radiation sum (MJ/m²d), and the mean daily vapour pressure (kPa). For details of calculation refer to OBERMEIERetal***
*Allen, R.G., L.S. Pereira, D. Raes, and M. Smith. Crop Evapotranspiration: Guidelines for computing crop water requirements. Irrigation and Drainage Paper 56, Food and Agriculture Organization of the United Nations, Rome. (1998).
**Bojanowski, J. S., Donatelli, M., Skidmore, A. K. & Vrieling, A. An auto-calibration procedure for empirical solar radiation models. Environmental Modelling & Software 49, 118–128 (2013).
*** |
|
|
FACE2FACE