[1514] - Comparing DTmax Determination Approaches for Granier-Based Sapflow Estimations

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Citation
Rabbel, I., Diekkrüger, B., Voigt, H., Neuwirth, B., 2016. Comparing DTmax Determination Approaches for Granier-Based Sapflow Estimations. sensors, 16 (12), 1 - 16. DOI: 10.3390/s16122042.
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Identification
Title(s):Main Title: Comparing DTmax Determination Approaches for Granier-Based Sapflow Estimations
Description(s):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(s):DOI: 10.3390/s16122042
Responsible Party
Creator(s):Author: Inken Rabbel
Author: Bernd Diekkrüger
Author: Holm Voigt
Author: Burkhard Neuwirth
Publisher:MDPI (Multidisciplinary Digital Publishing Institute), Basel, Switzerland
Topic
TR32 Topic:Vegetation
Related Sub-project(s):C1
Subject(s):CRC/TR32 Keywords: Sap Flow
Topic Category:Environment
File Details
File Name:Rabbel_et_al_2016.pdf
Data Type:Text
File Size:3504 kB (3.422 MB)
Date(s):Date Accepted: 2016-11-28
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:OnlyTR32
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
Geographic
North:-no map data
East:-
South:-
West:-
Measurement Region:Erkensruhr
Measurement Location:Wüstebach
Specific Informations - Publication
Status:Published
Review:PeerReview
Year:2016
Type:Article
Article Type:Journal
Source:sensors
Issue:12
Volume:16
Number Of Pages:16
Page Range:1 - 16
Metadata Details
Metadata Creator:Inken Rabbel
Metadata Created:2016-12-05
Metadata Last Updated:2017-01-03
Subproject:C1
Funding Phase:3
Metadata Language:English
Metadata Version:V41
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