| Title: |
Ground cover and biomass projection photos for the BBC collapse scar
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| Contacts: |
Myers-Smith, Isla
Chapin, F.S.
Harden, Jennifer
McGuire, A.
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| Abstract: |
We used digital photographs to project the biomass over the growing season. This data set contains ground cover photos of plots from the center of the BBC collapse scar (0m) into the surrounding fire scar (30m) of the Survey Line Fire (burned in June-July 2001) for the growing seasons of 2003 and 2004. Also included are ground cover photos of plots along the biomass transect used to create the projected biomass data.
We calculated the percent cover of vegetation for the biomass and intensively monitored transects from digital photographs. Photographs were rectified to 10,000 x 10,000 pixels and a 20 x 20 grid was applied to the photograph. The percentage of each plant type was estimated in each grid cell. The percent cover was regressed against the measured dry biomass to project biomass for the intensively measured transect. We did not project moss biomass and instead assumed it to be the same for both transects.
We projected the change in biomass over the growing season from the change in greenness determined from digital photographs. We chose five dates throughout the growing season with pictures of equal color saturation, focus and aspect. From these we estimated the percent photosynthetic biomass by selecting areas of green on the photograph and calculating the percentage of the total pixels made up by these areas. We estimated curves for the change in % green vegetation for 0, 6 m and the mean of the remaining distances along the transect (12, 18, 24, and 30 m), as these regions of the transect exhibited different patterns of greenness across the growing season of 2004. To estimate photosynthetic biomass over the growing season, we corrected the biomass estimates for the study transect to account for the change in green vegetation associated with growth and senescence
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| Keywords: |
biomass, ground cover, |
| Categories: |
Biogeochemistry
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| Study Period: |
Aug 6, 2003 to Sep 18, 2004
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| Bounding Box: |
West longitude: -148.3334833°
North latitude: 64.6408°
East longitude: -148.3334833°
South latitude: 64.6408°
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| Site References: |
BBC collapse scar -- The BBC collapse scar is located in Interior Alaska, USA, adjacent to the Bonanza Creek LTER on the south side of the Tanana River, approximately half way between Fairbanks and Nenana. The scar is located 0.5 km south of the river bank in a low lying black spruce tussock dominated wetland that was burned in June-July 2001 by the Survey Line fire.
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| Data Columns: |
| Column |
Name |
Units |
Type |
| 1 |
DOY |
DOY |
Datetime |
| 2 |
Distance |
meter |
float |
| 3 |
Side of Transect |
none |
string |
| 4 |
Projected Total Biomass (g/m2) |
gramsPerSquareMeter |
float |
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| Data File(s): |
biomass_photos.zip
biomass_projection_data.txt
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| Supplemental Files: |
|
| Metadata Formats: |
|
| Public Release: |
Nov 12, 2005
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| Publications: |
Myers-Smith, I., A.D. McGuire, J.W. Harden, and F.S. Chapin III. 2007. The influence of disturbance on carbon exchange in a permafrost collapse and adjacent burned forest. Journal of Geophysical Research - Biosciences 112, G04017, doi:10.1029 2007JG000423.
Myers-Smith, I.H., J.W. Harden, M. Wilmking, C.C. Fuller, A.D. McGuire, and F.S. Chapin, III. 2007. Wetland succession in a permafrost collapse: Interactions between fire and thermokarst. Biogeosciences Discussion 4:4507-4538.
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The Bonanza Creek LTER, including this website, is supported by the
National Science Foundation through awards
DEB-0620579,
DEB-0423442,
DEB-0080609,
DEB-9810217,
DEB-9211769,
DEB-8702629
and by the USDA Forest Service, Pacific Northwest Research Station through agreement number RJVA-PNW-01-JV-11261952-231.
Any opinions, findings, conclusions, or recommendations expressed in the
material are those of the author(s) and do not necessarily reflect
the views of the supporting agencies or the program as a whole.
© Bonanza Creek LTER, 2009.
Last modified 23-Nov-09
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