Sapflow and stomatal conductance data in 3 savanna tree species
Data files
Dec 20, 2023 version files 3.50 MB
Abstract
This dataset includes both sap flow and stomatal conductance data for 3 woody savanna species (11 individuals of Colophospermum mopane, and each 9 of both Senegalia mellifera and Catophractes alexandri). Each data point contains information on a browsing level that has been manually applied to an individual plant plus information on environmental conditions.
README: Sapflow and stomatal conductance data in 3 savanna tree species
This dataset contains sap flow and stomatal conductance data accompanied by information on a browsing level and environmental conditions such as climatic factors and soil moisture. Gradual browsing levels have been applied manually in a controlled experiment in a nature reserve in Namibia. Trees were protected by a fenced exclosure.
Description of the data and file structure
Data are stored in a csv file. Sap flow data include:
1. A timestamp in the YYYY-MM-DD HH-MM-SS format
2. Tree ID
3. Browsing Intensity in %
4. Sap flow density in g/cm² 0.5 h
5. The scientific species name
6. Vapor Pressure Deficit VPD in kPa
7. Soil moisture content in 50 cm depth in % under a tree
8. Soil moisture content in 10 cm depth in % under a tree
9. Solar radiation in µmol/ m² s
10. Information whether the data point was taken before or after browsing
Missing values are indicated by 'NA'
Stomatal conductance data include:
1. A timestamp in the YYYY-MM-DD HH-MM-SS format
2. Stomatal conductance in mmol/ m² s
3. Tree_ID
4. Vapor Pressure Deficit VPD in kPa
5. Solar radiation in µmol/ m² s
6. Browsing Intensity in %
7. The scientific species name
Missing values are indicated by 'NA'
Methods
Data were collected in a nature reserve in the Kunene region, Namibia. Sap flow measurements followed the thermal heat dissipation method established by Granier (1985, 1987). To prevent any NTG-related bias in sap flow estimates, we applied the cyclic heat dissipation method after Lubczynski et al. (2012). Raw data was logged every 30 seconds and processed data provided sap flow densities with a 30-minute resolution. Stomatal Conductance was measured with a Decagon Devices Leaf Porometer on the bottom side of the leaves (abaxial). Climatic and soil moisture data were obtained from a local weather station.