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: | |
| 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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Specific Information - Publication
| 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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| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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