HRM Sap Flow and Small Stems - ICT International
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HRM Sap Flow and Small Stems Sap Flow in Small Stems outlines how the SFM1 Sap Flow Meter can be installed on stems with a diameter of at least 1cm for precise measurements. The SFM1 Sap Flow Meter uses the Heat Ratio Method (HRM) Measures sap flow (water movement) or transpiration in woody plants Data can be used to accurately measure total plant water use on a hourly or daily basis SFM1 Sap Flow Meter can measure stems as narrow as 1cm Self contained, stand alone system IP65 rated water proof enclosure Low power demand Enabling better global research outcomes in soil, plant & environmental monitoring. www.ictinternational.com : [email protected] : +612 6772 6770
Transcript of HRM Sap Flow and Small Stems - ICT International
HRM Sap Flow and Small Stems
Sap Flow in Small Stems outlines how the SFM1 Sap Flow Meter can be installed on stems with a diameter of at least 1cm forprecise measurements.
The SFM1 Sap Flow Meter uses the Heat Ratio Method (HRM)
Measures sap flow (water movement) or transpiration in woody plantsData can be used to accurately measure total plant water use on a hourly or daily basisSFM1 Sap Flow Meter can measure stems as narrow as 1cm
Self contained, stand alone system
IP65 rated water proof enclosureLow power demand
Enabling better global research outcomes in soil, plant & environmental monitoring.www.ictinternational.com : [email protected] : +612 6772 6770
HRM Sap Flow and Small Stems
Extensive cables and battery systems not needed16GB memory capacityUSB, SD Card or wireless data transfer
The sensors measure heat pulse velocity by obtaining the ratio of downstream sapwood temperature to upstream sapwoodtemperature following the release of a heat pulse.
HRM Accuracy
Aim: To measure sap flow in a rose bush with a narrow diameter stem and to correlate measured data with environmentalvariables (vapour pressure deficit and solar radiation).
Enabling better global research outcomes in soil, plant & environmental monitoring.www.ictinternational.com : [email protected] : +612 6772 6770
HRM Sap Flow and Small Stems
Methods: Species: Rose, cultivar Grimaldi approximately 0.6m tall, stem diameter 1.4cm
Sap Flow measured using Heat Ratio Method (Burgess et al . 2001*).
Linear regression of Sap Flow versus VPD and Solar Radiation used to assess accuracy of data.
Cover needles with foam insulation in order to avoid external heat influences.
Enabling better global research outcomes in soil, plant & environmental monitoring.www.ictinternational.com : [email protected] : +612 6772 6770
HRM Sap Flow and Small Stems
Results:
Basic interpretation of data on visual inspection:Diurnal and nocturnal sap flowWarm and Cool Weather
Enabling better global research outcomes in soil, plant & environmental monitoring.www.ictinternational.com : [email protected] : +612 6772 6770
HRM Sap Flow and Small Stems
Analysis from Sap Flow Tool software: (www.sapflowtool.com) Indicated the rose plant used on average 0.12 Litres of waterper day.
Enabling better global research outcomes in soil, plant & environmental monitoring.www.ictinternational.com : [email protected] : +612 6772 6770
HRM Sap Flow and Small Stems
Results
Environmental Drivers of Sap Flow: Vapour Pressure Deficit (VPD).
Below is an example of sap flow data from HRM sensor inserted in a narrow rose stem over a seven day period.
Enabling better global research outcomes in soil, plant & environmental monitoring.www.ictinternational.com : [email protected] : +612 6772 6770
HRM Sap Flow and Small Stems
Results
Environmental Drivers of Sap Flow: Solar Radiation.
Below is an example of sap flow data from HRM sensor inserted in a narrow rose stem over a seven day period.
Enabling better global research outcomes in soil, plant & environmental monitoring.www.ictinternational.com : [email protected] : +612 6772 6770
HRM Sap Flow and Small Stems
Results
Statistical Analysis
Enabling better global research outcomes in soil, plant & environmental monitoring.www.ictinternational.com : [email protected] : +612 6772 6770
HRM Sap Flow and Small Stems
Note: Data are sum of diurnal sap flow, VPD and solar radiation; data were square – root transformed to meet assumptions ofnormality; p – value less than 0.05 indicate data are significantly correlated; larger R 2 value in Sap Flow vs VPD indicates VPDis a stronger driver of sap flow than solar radiation in this rose plant at this location during this weather period.
Summary
With careful experimental design and installation, sap flow of stems with a diameter of at least 1cm can be accuratelymeasuredNeedles must be insulated to buffer external heat influences such as direct sunlightSap flow data show a significant relationship with environmental drivers Vapour Pressure Deficit and Solar RadiationThe rose plant in this example was found to use on average 0.12 Litres of water per day under temperate summerweather conditions
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Enabling better global research outcomes in soil, plant & environmental monitoring.www.ictinternational.com : [email protected] : +612 6772 6770
