Title:Eight Mile Lake Research Watershed, Carbon in Permafrost Experimental Heating Research (CiPEHR): physical and chemical properties of soils, 2009-2013
Creator(s):Plaza, César (Affiliated Scientist)
Schuur, Edward A.G. (Principal Investigator)
Pegoraro, Elaine F. (PhD Student)
The Carbon in Permafrost Experimental Heating Research (CiPEHR) project addresses the following questions: 1) Does ecosystem warming cause a net release of C from the ecosystem to the atmosphere?, 2) Does the decomposition of old C, that comprises the bulk of the soil C pool, influence ecosystem C loss?, and 3) How do winter and summer warming alone, and in combination, affect ecosystem C exchange? We are answering these questions using a combination of field and laboratory experiments to measure ecosystem carbon balance and radiocarbon isotope ratios at a warming experiment located in an upland tundra field site near Healy, Alaska in the foothills of the Alaska Range. This data set includes measurements of moisture, bulk density, ash, carbon, and nitrogen concentrations, and carbon and nitrogen stable isotope composition (?13C and ?15N) at depth increments in soil cores collected in 2009, 2010, 2011, and 2013 from warming and control treatment plots.
Methods:FIELD: Soils were sampled from control and warming plots in May-June 2009, 2010, 2011, and 2013. The surface soil was cut out in rectangular chunks and the underlying soil was sampled using a 7.6-cm drill. LAB: Samples were sectioned into 5-10-cm-depth increments and weighted. Soils were subsampled for analysis after removing stones. Moisture content was determined by mass loss after drying at 60 ºC for 3 days; bulk density was calculated as dry mass divided by volume excluding mass and volume of stones; ash concentration was determined on dried, ground subsamples by mass loss after igniting at 550 ºC for 12 hours; carbon and nitrogen concentrations were determined by dry combustion using a Costech Analytical ECS 4010 elemental analyzer; carbon and N stable isotope composition was determined using a Thermo Electron Delta V Advantage isotope ratio mass spectrometer coupled with a Carlo Erba NC2100 Elemental Analyzer.
Experimental Design:
The study site at the Eight Mile Lake (EML) watershed is located in the northern foothills of the Alaska Range. While permafrost thaw can sometimes result in water ponding, depending on local topography, this landscape consists largely of relatively well-drained uplands. The CiPEHR experiments were established in 2008 to complement research along a natural permafrost thaw gradient, at an adjacent site. At the permafrost-thaw gradient site permafrost temperature has been monitored annually in a 30-m-deep borehole since1985, before the permafrost started to thaw. There are two experimental warming treatments at the CiPEHR project: Winter warming (WW) increases soil temperature and ground thaw using snow fences; Summer warming (SW) increases growing season air temperature using open top chambers. The warming treatments are applied in a blocked split-plot design to evaluate the seperate and combined effects of winter and summer warming. Soils were cored from control and warming treatment plots in 2009, 2010, 2011, and 2013 and analyzed for moisture, bulk density, ash, carbon, and nitrogen concentrations, and carbon and nitrogen stable isotope composition (?13C and ?15N).
Supplemental Documentation:
Instrumentation Used: Bruker AV 400 MHz spectrometer equipped with a 4-mm 1H/X/Y MAS probe.
Supplemental Acknowledgements:The Schuur lab data provided on this site are freely available and were furnished by individual Schuur lab members who encourage their use. Please kindly inform in writing (or e-mail) the appropriate Schuur lab scientist(s) (PI) of how you intend to use the data and of any publication plans. It is also important to contact the Schuur lab investigator to assure you are downloading the latest revision of the data and to prevent potential misuse or misinterpretation of the data. Please acknowledge the data source as a citation. If the Schuur lab (PIs) feel that they should be acknowledged or offered participation as authors, they will let you know and we assume that an agreement on such matters will be reached before publishing and/or use of the data for publication. If your work directly competes with the Schuur lab analysis they may ask that they have the opportunity to submit a manuscript before you submit one that uses unpublished data. In addition, when publishing please acknowledge the agency that supported the research. Lastly, we kindly request that those publishing papers using Schuur lab data provide reprints to the PIs. [This statement taken from The Ameriflux Network data sharing policy]. Department of Energy NICCR Program; Department of Energy Terrestrial Ecosystem Processes; National Science Foundation CAREER Program; National Parks Inventory and Monitoring Program; National Science Foundation Bonanza Creek LTER program; National Science Foundation Office of Polar Programs, Arctic Natural Sciences Program. CP acknowledges support from the European Union's Horizon 2020 research and innovation programme under the Marie Sk?odowska-Curie grant agreement No 654132.
Keywords:ash, Bulk density, carbon, climate, isotopes, nitrogen, soils
Categories:Biogeochemistry, Climate, Decomposition, Disturbance, GIS, Primary Production, Soils, Succession, Vegetation
Study Period:2009-05-01 to 2013-06-01
Bounding Box:
West Longitude: -149.225556°
North Latitude: 63.883056°
East Longitude: -149.225556°
South Latitude: 63.883056°
Datum: NAD83
Site References:

EML: Tussock tundra at treeline with permafrost thaw and thermokarst. This site is in the Eight Mile Lake Watershed, west of the town of Healy on Stampede Road, Interior Alaska. This area contains three sites on a permafrost thaw gradient and a nearby experimental snow fence manipulation.

Data Columns:
1yearmm/dd/yyyyYear soil was sampled
2blockN/AExperimental block
3fenceN/ASnow fence replicate number
4treatmentN/ATreatment type
5depthcmDepth increment
6moistureg kg-1Moisture
7bulk.densityg cm-3Bulk density
8ashg kg-1Ash concentration
9Cg kg-1Carbon concentration
10Ng kg-1Nitrogen concentration
11delta13Cper milNatural abundance ?13C
12delta15Nper milNatural abundance ?15N
Data File(s): 655_EML_AK_CiPEHR_SoilProperties_2009-2013_Data.csv (17.06K, 389 rows)
... (389 rows total)
Image File(s): There are no image files available with this data package.
Supplemental File(s): There are no supplemental files available with this data package.
Metadata Formats: Full Metadata (HTML format)
EML (Ecological Metadata Language - XML format)
Public Release:2017-02-28
Network Data ID:knb-lter-bnz.655.2

Bracho, R., S.M.N. Natali, E.F. Pegoraro, K.G. Crummer, C. Schadel, C. Celis, L. Hale, L. Wu, H. Yin, J.M. Tiedje, K.T. Konstantinidis, Y. Luo, J. Zhou, E.A.G. Schuur. 2016. Temperature sensitivity of microbial organic matter decomposition of permafrost-region soils during laboratory incubations. Soil Biology & Biochemistry 97. pp. 1-14. doi: 10.1016/j.soilbio.2016.02.008

Webb, E.E., E.A.G. Schuur, S.M.N. Natali, K.L. Oken, R. Bracho, J.P. Krapek, D. Risk, N.R. Nickerson. 2016. Increased wintertime CO2 loss as a result of sustained tundra warming. Journal of Geophysical Research - Biogeosciences 121. pp. 249-265. doi: 10.1002/2014JG002795

Salmon, V.G., P. Soucy, M. Mauritz, Dr., S.M.N. Natali, M.C. Mack, E.A.G. Schuur. 2016. Nitrogen availability increases in a tundra ecosystem during five years of experimental permafrost thaw. Global Change Biology 22. pp. 1927-1941. doi: 10.1111/gcb.13204

Deane-Coe, K.K., M. Mauritz, Dr., C. Celis, V.G. Salmon, K.G. Crummer, S.M.N. Natali, E.A.G. Schuur. 2015. Experimental Warming Alters Productivity and Isotopic Signatures of Tundra Mosses. Ecosystems 18. pp. 1070-1082. doi: 10.1007/s10021-015-9884-7

Natali, S.M., E.A.G. Schuur, E. Webb, C.E. Hicks Pries, and K.G. Crummer. 2014. Permafrost degradation stimulates carbon loss from experimentally warmed tundra. Ecology 95(3):602–608. DOI: 10.1890/13-0602.1

Natali, SM, EAG Schuur, C Trucco, CE Hicks Pries, KG Crummer, and AF Baron Lopez. 2011. Effects of experimental warming of air, soil and permafrost on carbon balance in Alaskan tundra. Global Change Biology 17: 1394-1407. doi: 10.1111/j.1365-2486.2010.02303.x

Natali, S.M., E.A.G. Schuur, R.L. Rubin. 2011. Increased plant productivity in Alaskan tundra with experimental warming of soil and permafrost. Journal of Ecology, doi: 10.1111/j.1365-2745.2011.01925.x

Hicks-Pries, C.E., E.A.G. Schuur, S.M. Natali, and J.G. Vogel. 2013. Moisture controls decomposition rate in thawing tundra. Journal of Geophysical Research - Biogeosciences 18:1-11. doi:10.1002/jgrg.20089

Hicks-Pries, C.E., E.A.G. Schuur, S.M.N. Natali, K.G. Crummer. 2015. Old soil carbon losses increase with ecosystem respiration in experimentally thawed tundra. Nature Climate Change. Published Online 26 October 2015. 7 p. doi: 10.1038/nclimate2830

Data Citation:Plaza, César; Schuur, Edward A.G.; Pegoraro, Elaine F. 2017. Eight Mile Lake Research Watershed, Carbon in Permafrost Experimental Heating Research (CiPEHR): physical and chemical properties of soils, 2009-2013 , Bonanza Creek LTER - University of Alaska Fairbanks. BNZ:655, doi:10.6073/pasta/4a208d9f42346a9ebd273fd356d51043
Data Acknowledgement:Data are provided by the Bonanza Creek LTER, a partnership between the University of Alaska Fairbanks, and the U.S. Forest Service. Significant funding for collection of these data was provided by the National Science Foundation Long-Term Ecological Research program (NSF Grant numbers DEB-1636476, DEB-1026415, DEB-0620579, DEB-0423442, DEB-0080609, DEB-9810217, DEB-9211769, DEB-8702629) and by the USDA Forest Service, Pacific Northwest Research Station (Agreement # RJVA-PNW-01-JV-11261952-231).
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