uid=BNZ,o=EDI,dc=edirepository,dc=org all public read knb-lter-bnz.22.19 F Stuart Chapin Principal Investigator (retired)

Institute of Arctic Biology: University of Alaska Fairbanks Fairbanks AK 99775 United States

(907) 455-6408 (907) 474-6967 terry.chapin@alaska.edu https://sites.google.com/alaska.edu/f-stuart-chapin-iii-terry/ Leslie Viereck Bonanza Creek LTER

Boreal Ecology Cooperative Research Unit University of Alaska Fairbanks P.O. Box 756780 Fairbanks AK 99775 USA

907-474-6364 907-474-6251 uaf-bnz-im-team@alaska.edu http://www.lter.uaf.edu Bonanza Creek LTER Data Manager

Boreal Ecology Cooperative Research Unit University of Alaska Fairbanks P.O. Box 756780 Fairbanks AK 99775 USA

907-474-6364 907-474-6251 uaf-bnz-im-team@alaska.edu http://www.lter.uaf.edu 1998-01-15 This data file includes the net nitrogen mineralization potentials and net nitrification potentials estimated in a lab incubation for the top 20cm of soils collected as part of the harvest of the artificial communities experiment in 2002.The 2002 harvest was conducted to calculate total plant and soil N and C accumulation and above ground biomass in the artificial communities after 13 years of growth. Aboveground biomass data can be found in the data file �Artificial communities biomass in 2002�. And soil physical characteristics including bulk densities can be found in the file �Artificial communities soil physical characteristics�. artificial communities seedlings height survival alder spruce Succession

This work has been produced as part of the Long Term Ecological Research Program and data users should adhere to the Data Use Agreement of the Long Term Ecological Research Network. The consumer of these data (“Data User” herein) has an ethical obligation to cite it appropriately in any publication that results from its use. The Data User should realize that these data may be actively used by others for ongoing research and that coordination may be necessary to prevent duplicate publication. The Data User is urged to contact the authors of these data if any questions about methodology or results occur. Where appropriate, the Data User is encouraged to consider collaboration or coauthorship with the authors. The Data User should realize that misinterpretation of data may occur if used out of context of the original study. While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed. All data are made available “as is.” The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data. Thank you.

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While substantial efforts are made to ensure the accuracy of data and documentation contained in this Data Set, complete accuracy of data and metadata cannot be guaranteed. All data and metadata are made available in its present condition. The Data User holds all parties involved in the production or distribution of the Data Set harmless for damages resulting from its use or interpretation.

http://www.lter.uaf.edu/data/data-detail/id/22 Dataset geographic description information is unavailable. {datafile/geoCoverage is empty} -148.2701852 -148.1435205 64.73028888 64.68584608 1992-07-01 2002-08-03

Completed

Bonanza Creek LTER Data Manager

Boreal Ecology Cooperative Research Unit University of Alaska Fairbanks P.O. Box 756780 Fairbanks AK 99775 USA

907-474-6364 907-474-6251 uaf-bnz-im-team@alaska.edu http://www.lter.uaf.edu Bonanza Creek LTER

Boreal Ecology Cooperative Research Unit University of Alaska Fairbanks P.O. Box 756780 Fairbanks AK 99775 USA

907-474-6364 Bonanza Creek LTER

Three types of 20 m x 20 m artificial communities were established on each of six replicate early successional sites (two replicates at each of three LTER sites): pure spruce plots planted at 1 m spacing, plots with spruce mixed with alder (spruce planted at 1 m spacing, alder planted between spruce seedlings), and pure spruce in which N fertilizer will be added (N was never added). As a result of bank erosion, several of the plots at FP1A were destroyed, and that site was eliminated. Pure spuirce plots (also referred to as communities) were assigned the designator "PS" (PS1, PS2, PS3, and PS4). Mixed alder and spruce plots (also referred to as communities) were assigned the designator "AS" (AS2 and AS2).

Four points were randomly selected within each plot for quadrate sampling in the 2002 harvest. We took soil cores to a depth of 1m from the center of each quadrate. We divided the entire soil core into 3 segments based on depth: 0-5cm, 5-20cm, and 20-100cm. each segment was separated into mineral soil, organic soil, mixed (mineral and organic soil that could not be separated into a specific component), and buried organic soil. Buried organic soils were organic soils found beneath mineral soil because of silt deposition. All buried organic layers were compositied into a single sample in each segment. We recorded the wet weight (field moisture content) of each sample and calculated the dry weight using the wet to dry ratio. The wet to dry ratio was determined in the lab after weighing, oven drying, and re-weighing a sub-sample of each soil. Potential net mineralization rates were determined on the separated soil components from the top 20 cm of the core. On 3 August, 2002, two 10 g samples (fresh weight) of each soil were placed into separate 150ml specimen cups. No adjustments for water holding capacity was made. Nitrogen was immediately extracted form one sample of each pair. The remaining sample was placed into a 1 L mason jar, covered with a polyethylene bag (to maintain moisture content but allow for gas exchange), and placed on a lab shelf to incubate at room temperature. Nitrogen was extracted from these remaining samples following 38 days of incubation. Nitrogen was extracted with 1 M KCl. 75 ml of KCl was placed into each specimen cup. These were capped and shaken for one hour on a shaker table at approximately 250 rpm. After shaking, the samples were extracted under a vacuum through a glass fiber filter. Solution NH4+-N and NO2/NO3-N of each extract was determined colorimetrically on a modified technicon autoanalyzer (Tarrytown, New York, USA). Potential net nitrogen mineralization rates (�g N/g dwt soil/day) were calculated as the final extractable ammonium and nitrate concentrations minus the initial ammonium and nitrate concentrations. Potential net nitrification rates (�g N/g dwt soil/day) were calculated as the final extractable nitrate concentrations minus the initial nitrate concentrations.

FP1B -- FP1B is located on a low early successional terrace adjacent to the Tanana River.. Site alternate names: 212 -148.149437 -148.149437 64.73146502 64.73146502 FP1C -- FP1C is located on a low early successional terrace adjacent to the Tanana River.. Site alternate names: 213 -148.2744455 -148.2744455 64.68671338 64.68671338 1992-07-01 2002-08-03

Once

Keith Van Cleve Bonanza Creek LTER Lead Principal Investigator Principal Investigator F.S. Stuart Chapin Bonanza Creek LTER Lead Principal Investigator

Department of Biology and Wildlife; Institute of Arctic Biology: University of Alaska Fairbanks 193 Arctic Health P.O. Box 757000 Fairbanks AK 99775 United States

(907) 455-6408 (907) 474-6967 terry.chapin@alaska.edu http://terrychapin.org/ Principal Investigator Roger W. Ruess Bonanza Creek LTER Lead Principal Investigator

Institute of Arctic Biology University of Alaska Fairbanks P.O. Box 757000 Fairbanks AK 99775-0180 United States

(907) 474-7153 (907) 474-6967 rwruess@alaska.edu http://www.iab.uaf.edu/~roger_ruess/ Principal Investigator Michelle Cailin Mack Bonanza Creek LTER Lead Principal Investigator

Northern Arizona University: Ecosystem Science and Society Center (ECOSS) PO Box 5620 Flagstaff AZ 86011 United States

(928) 523-9415 Michelle.Mack@nau.edu https://macklab.nau.edu/ Principal Investigator NSF Grant numbers DEB-2224776, DEB-1636476, DEB-1026415, DEB-0620579, DEB-0423442, DEB-0080609, DEB-9810217, DEB-9211769, DEB-8702629 USDA Forest Service, Pacific Northwest Research Station (Agreement # RJVA-PNW-20-JV-11261932-018) 22_Artificial_communities_net_N_mineralization_and_nitrification_potentials.txt This data file includes the net nitrogen mineralization potentials and net nitrification potentials estimated in a lab incubation for the top 20cm of soils collected as part of the harvest of the artificial communities experiment in 2002. 22_Artificial_communities_net_N_mineralization_and_nitrification_potentials.txt 1 \n \n column , http://www.lter.uaf.edu/php/download_data.php?f=/ascii/files/22_Artificial_communities_net_N_mineralization_and_nitrification_potentials.txt Sample Sample Sample number integer Sample number Site Site Sites name for earch record. string Sites name for earch record. Community Community A way to distinguish between Spruce and mixed Spruce sites. string PS Pure Spruce AS Mixed Spruce Rep Rep Replication number integer Replication number Quadrate Quadrate Each Rep was broken into four quadrates. integer Each Rep was broken into four quadrates. Soil type Soil type A definition of which Soil type is beening measured (organic, mineral, buried organic, or mixed organix and mineral string A definition of which Soil type is beening measured (organic, mineral, buried organic, or mixed organix and mineral Soil sub-type Soil sub-type Identifies if the organic layer was buried string Identifies if the organic layer was buried Depth Depth Depth of core string Depth of core NO2/NO3-N ppm (7 Aug 02) NO2/NO3-N ppm (7 Aug 02) Parts per million NO2/NO3-N float ppm real NH4-N ppm (7 Aug 02) NH4-N ppm (7 Aug 02) Parts per million NH4-N float ppm real NO2/NO3-N ppm (10 Sept 02) NO2/NO3-N ppm (10 Sept 02) Parts per million NO2/NO3-N float ppm real NH4-N ppm (10 Sept 02) NH4-N ppm (10 Sept 02) Parts per million NH4-N float ppm real Extract volume (mls) Extract volume (mls) Extract volume float mls real ug NO2/NO3-N (7 Aug 02) ug NO2/NO3-N (7 Aug 02) Micrograms of NO2/NO3-N float ug real ug NH4-N (7 Aug 02) ug NH4-N (7 Aug 02) Micrograms of NH4-N float ug real ug NO2/NO3-N (10 Sept 02) ug NO2/NO3-N (10 Sept 02) Micrograms of NO2/NO3-N float ug real ug NH4-N (10 Sept 02) ug NH4-N (10 Sept 02) Micrograms of NH4-N float ug real Mass wet soil (g) Mass wet soil (g) Mass wet soil float Mass wet soil Soil wet to dry ratio Soil wet to dry ratio Soil wet to dry ratio float dimensionless real Mass dry soil (g) Mass dry soil (g) Mass dry soil float Mass dry soil Incubation durration (days) Incubation durration (days) Incubation durration in number of days integer Incubation durration in number of days Net N mineralization potential (ug N/g dwt soil/day) Net N mineralization potential (ug N/g dwt soil/day) Net N mineralization potential float ug real Net nitrification potential (ug N/g dwt soil/day) Net nitrification potential (ug N/g dwt soil/day) Net nitrification potential float ug real