Comparing DTmax Determination Approaches for Granier-Based Sapflow Estimations

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Title:Main Title: Comparing DTmax Determination Approaches for Granier-Based Sapflow Estimations
Description:Abstract: Granier-type thermal dissipation probes are common instruments for quantifying tree water use in forest hydrological studies. Estimating sapflow using Granier-type sapflow sensors requires determining the maximum temperature gradient (DTmax) between the heated probe and the reference probe below. DTmax represents a state of zero sap flux, which was originally assumed to occur each night leading to a DTmax determination on a daily basis. However, researchers have proven that, under certain conditions, sapflow may continue throughout the night. Therefore alternative approaches to determining DTmax have been developed. Multiple DTmax approaches are now in use; however, sapflow estimates remain imprecise because the empirical equation that transfers the raw temperature signal (DT) to sap flux density (Fd) is strongly sensitive to DTmax. In this study, we analyze the effects of different DTmax determination approaches on sub-daily, daily and (intra-)seasonal Fd estimations. On this basis, we quantify the uncertainty of sapflow calculations, which is related to the raw signal processing. We show that the DTmax determination procedure has a major influence on absolute DTmax values and the respective sap flux density computations. Consequently, the choice of the DTmax determination approach may be a significant source of uncertainty in sapflow estimations.
Identifier:10.3390/s16122042 (DOI)
Responsible Party
Creators:Inken Rabbel (Author), Bernd Diekkrüger (Author), Holm Voigt (Author), Burkhard Neuwirth (Author)
Publisher:MDPI (Multidisciplinary Digital Publishing Institute), Basel, Switzerland
Publication Year:2016
Topic
TR32 Topic:Vegetation
Related Subproject:C1
Subject:Keyword: Sap Flow
Geogr. Information Topic:Environment
File Details
Filename:Rabbel_et_al_2016.pdf
Data Type:Text - Article
File Size:3.4 MB
Date:Accepted: 28.11.2016
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:[TR32DB] Data policy agreement
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Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:sensors
Source Website:www.mdpi.com/journal/sensors
Issue:12
Volume:16
Number of Pages:16 (1 - 16)
Metadata Details
Metadata Creator:Inken Rabbel
Metadata Created:05.12.2016
Metadata Last Updated:05.12.2016
Subproject:C1
Funding Phase:3
Metadata Language:English
Metadata Version:V50
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