Skip to Main Content
Examining spring phenology of forest understory using digital photographyAuthor(s): Liang Liang; Mark D. Schwartz; Songlin Fei
Source: In: Fei, Songlin; Lhotka, John M.; Stringer, Jeffrey W.; Gottschalk, Kurt W.; Miller, Gary W., eds. Proceedings, 17th central hardwood forest conference; 2010 April 5-7; Lexington, KY; Gen. Tech. Rep. NRS-P-78. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 51-57.
Publication Series: General Technical Report - Proceedings
Station: Northern Research Station
PDF: Download Publication (330.59 KB)
DescriptionPhenology is an important indicator of forest health in relation to energy/nutrient cycles and species interactions. Accurate characterization of forest understory phenology is a crucial part of forest phenology observation. In this study, ground plots set up in a temperate mixed forest in Wisconsin were observed with a visible-light digital camera during spring 2007. High-frequency microclimatic data were collected concurrently. A green pixel extraction technique was used to derive phenological patterns from digital photos. Correlations were examined between derived phenology signals and climatic variables. Results indicate that though understory phenology was generally correlated with spring warmth accumulation, its daily change rate was significantly correlated with air moisture variability rather than with temperature-based weather fluctuations. We inferred that understory flush regime during springtime in a mesic temperate forest could depend more on precipitation than on temperature, due to the presumably shallower root systems. Furthermore, the study suggests that visible-light digital photography is an effective, easy-to-implement method for observing understory phenology and for other forest monitoring tasks.
- 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.
CitationLiang, Liang; Schwartz, Mark D.; Fei, Songlin. 2011. Examining spring phenology of forest understory using digital photography. In: Fei, Songlin; Lhotka, John M.; Stringer, Jeffrey W.; Gottschalk, Kurt W.; Miller, Gary W., eds. Proceedings, 17th central hardwood forest conference; 2010 April 5-7; Lexington, KY; Gen. Tech. Rep. NRS-P-78. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 51-57.
- Linking phenological indices from digital cameras in Idaho and Montana to MODIS NDVI
- A tale of two springs: using recent climate anomalies to characterize the sensitivity of temperate forest phenology to climate change
- Net carbon uptake has increased through warming-induced changes in temperate forest phenology
XML: View XML