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| Type: | Resource | |
| Storage: | The size of this resource is 2.8 KB | |
| Created: | Jan 23, 2023 at 7:46 p.m. | |
| Last updated: | Nov 10, 2023 at 6:20 p.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Discoverable |
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| Views: | 1491 |
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Abstract
This dataset includes sap flux (cm3 cm-2 hr-1) measurements from instrumented trees at the Delaware Forested site (Milford Neck) for the CZNet Coastal Cluster. Tree sap flux reflects tree water use within xylem, rather than flow of tree sap (within phloem). Twelve Pinus taeda (loblolly pine) trees were initially selected for instrumentation. Selection was based on high canopy integrity and large DBH that was uniform across the site and reflected tree maturity. Selected trees were instrumented with heat pulse velocimetry (HPV) sap flow sensors (Implexx model, Edaphic Scientific, Melbourne, Australia). Sensors consist of three equidistant 30 mm-long probes: a central heating probe, a downstream, and an upstream probe. Each probe contains an inner and outer thermistor for functional redundancy and cross-sectional averaging. The Implexx HPV sensors work functionally similar to thermal dissipation probes. Sensors were installed in tree trunks at 1 m in height above the soil surface on the south side of the tree trunk. Bark thickness was shaved to <0.5 cm thickness in a small area for the probe installation so that thermistors were installed in sapwood. Data from sensors was collected every 30 minutes with a CR300 datalogger (Campbell Scientific). Power was supplied with a 7W solar panel and stored in a 12V sealed lead-acid battery. Because the datalogger batteries occasionally died or failed to charge by the solar power (particularly in mid-summer, when the forest canopy was full), there may be gaps in the record.
Subject Keywords
Coverage
Spatial
Temporal
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Content
Additional Metadata
| Name | Value |
|---|---|
| Units | cm3/cm2/hr (sap water volume (cubic centimeter) per unit of cross sectional area of sapwood (square centimeter), rate of flow per hour) |
| Method | Data collected using Implexx HPV sap flow sensors by Edaphic Scientific |
| Frequency | 30-minute intervals |
| Timestamp | Times in this dataset are in Eastern Standard Time (EST); MM-DD-YYYY HH:MM:SS; UTC Offset - 5 hours |
| Variables | Sap flow |
| Dataset Type | Time-series |
| Sample medium | Wood |
| Processing Level | Files ending in _raw are unprocessed. In processed datafiles (files ending in _proc),timestamp issues have been corrected, sap flux rates are zeroed based on the prior night's sap flow minimum, and errant measurements related to low battery voltage have been removed. |
Credits
Funding Agencies
This resource was created using funding from the following sources:
| Agency Name | Award Title | Award Number |
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| National Science Foundation (NSF) | Collaborative Research: Network Cluster: The Coastal Critical Zone: Processes that transform landscapes and fluxes between land and sea | 2012319 |
Contributors
People or Organizations that contributed technically, materially, financially, or provided general support for the creation of the resource's content but are not considered authors.
| Name | Organization | Address | Phone | Author Identifiers |
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| Rachel McQuiggan | University of Delaware;Delaware Geological Survey | Delaware, US |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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