Skip to Main Content
Preliminary results of sugar maple carbohydrate and growth response under vacuum and gravity sap extractionAuthor(s): Mark L. Isselhardt; Timothy D. Perkins; Abby K. van den Berg; Paul G. Schaberg
Source: Forest Science. 62(2): 125-128.
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
Download Publication (168.0 KB)
DescriptionRecent technological advancements have increased the amount of sugar-enriched sap that can be extracted from sugar maple (Acer saccharum). This pilot study quantified overall sugar removal and the impacts of vacuum (60 cm Hg) and gravity sap extraction on residual nonstructural carbohydrate (NSC) concentrations and on stem and twig growth. Vacuum sap extraction (VSE) resulted in significantly greater mean sugar removal (1.19 ± 0.46 kg [SE]) than gravity sap extraction (GSE) (0.48 ± 0.14 kg). Residual stem NSC displayed a pattern of increased concentration with increased extraction. Twig residual NSC concentrations were highly variable, perhaps because of the highly dynamic late spring period, and no clear patterns were observed. Mean radial stem growth in the year after sap extraction was greater in untapped trees (2.93 ± 0.58 mm) than with VSE (1.99 ± 0.44 mm) or GSE (1.67 ± 0.12 mm). The results raise the possibility that sap removal shifts sugar maple NSC source-sink relationships toward storage at the expense of growth.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationIsselhardt, Mark L.; Perkins, Timothy D.; van den Berg, Abby K.; Schaberg, Paul G. 2016. Preliminary results of sugar maple carbohydrate and growth response under vacuum and gravity sap extraction. Forest Science. 62(2): 125-128.
Keywordsmaple syrup, nonstructural carbohydrate (NSC), maple sap, growth
- A sugar maple planting study in Vermont
- Some effects of paraformaldehyde on wood surrounding tapholes in sugar maple trees
- Ray tissues as an indirect measure of relative sap-sugar concentration in sugar maple
XML: View XML