uid=BNZ,o=EDI,dc=edirepository,dc=org all public read knb-lter-bnz.150.20 Jen Mitchell

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

(907) 474-7153 jennifersmitchell@gmail.com 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 Roger Ruess Professor of Biology

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

(907) 474-7153 (907) 474-6967 Associated party 2005-11-20 We measured rates of nitrogen fixation by Alnus viridis spp. fruticosa and concurrent subcanopy soil temperature at BNZ LTER. To do so we utilized replicate (n=3/stage) stands of a seral sequence of successional stages maintained by the Bonanza Creek Long-Term Ecological Research program (BNZ LTER). At each of the 9 replicate stands we selected a total of 70 individual shrubs. During each of 7 sampling periods, 3 across the growing season of 1997 and 4 during 1998, we randomly selected 10 of 70 A. viridis spp. fruticosa at each replicate stand. We used acetylene reduction assays (ARA) to estimate rates of N2 fixation at each of the selected shrubs and concurrently measured soil temperature at each shrub. The attached database may be utilized to (1) elucidate seasonal trends in rates of N2 fixation by A. viridis spp. fruticosa across a boreal forest chronosequence and (2) investigate soil temperature controls over rates of N2 fixation. It may also be used to statistically analyze differences between years, successional stages and replicates within successional stage in both rates of ARA and temperature. We developed this database to describe seasonal trends of rates of nitrogen fixation by A. viridis spp. fruticosa across a boreal forest chronosequence and to elucidate soil temperature controls over rates. nitrogen cycling soil temperature nitrogen fixation secondary succession alder Biogeochemistry

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.

It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User should properly cite the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set. Citation should take the following general form: Creator(s), Year of Data Publication, Title of Dataset, Publisher, Dataset identifier, Dataset URL, Dataset DOI. For Example: Van Cleve, Keith; Chapin, F. Stuart; Ruess, Roger W. 2016. Bonanza Creek Experimental Forest: Hourly Temperature (sample, min, max) at 50 cm and 150 cm from 1988 to Present, Bonanza Creek LTER - University of Alaska Fairbanks. BNZ:1, http://www.lter.uaf.edu/data/data-detail/id/1. doi:10.6073/pasta/725db90d86686be13e6d6b2da5d61217.

The Data User should acknowledge any institutional support or specific funding awards referenced in the metadata accompanying this dataset in any publications where the Data Set contributed significantly to its content. Acknowledgements should identify the supporting party, the party that received the support, and any identifying information such as grant numbers. For example: 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-2224776, 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-20-JV-11261932-018).

The Data User will notify the Data Set Contact when any derivative work or publication based on or derived from the Data Set is distributed.

The Data Set has been released in the spirit of open scientific collaboration. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

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/150 Dataset geographic description information is unavailable. {datafile/geoCoverage is empty} -148.3599027 -148.2446238 64.7666796 64.68945831 1997-06-03 1998-09-25

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

At each of the 9 replicate stands we selected a total of 70 individual shrubs. During each of 7 sampling periods, 3 and 4 across the growing seasons of 1997 and 1998 respectively, we randomly selected 10 of 70 A. viridis spp. fruticosa at each replicate

UP1A -- UP1A was established to follow the development of vegetation following the burning of a well developed 200 year old white spruce stand on a south facing slope. The vegetation has progressed from an herbaceous community following the fire to an open hardwood stand.. Site alternate names: 111, Midslope White Spruce (MW), Rosie Creek Fire studies: Gregory stand #806, Zasada stand: Bonanza Creek #2 (white spruce seed study), Reserve West (Juday), FSL-LD-UP1A_ws -148.3027284 -148.3027284 64.73554387 64.73554387 UP1B -- Young Paper Birch/Shrub/Herbaceous Stand. Site alternate names: 112, FSL-LD-UP1B_ws -148.3000982 -148.3000982 64.73463679 64.73463679 UP2A -- Closed Mixed White Spruce - Paper Birch Stand. Site alternate names: 121, LTER #121, FSL-LD-UP2A_birch -148.35568 -148.35568 64.69546067 64.69546067 UP2B -- Closed Mixed White Spruce - Paper Birch Stand. Site alternate names: 122, LTER #122, FSL-LD-UP2B_birch -148.3641664 -148.3641664 64.6905617 64.6905617 UP3A -- Mature white spruce spruce stand on a south-facing slope. Site alternate names: 131, LTER #131, Tower site: Parks Hwy, South side: Gregory stand #148, Zasada stand: Bonanza Creek - 1 (seed studies), Semi-intensive site #12, Juday, Parks Loop West, Tower Site, FSL-LD-UP3A_ws -148.2795018 -148.2795018 64.76742521 64.76742521 UP3B -- Closed White Spruce Forest. Site alternate names: 132, LTER #132, FSL-LD-UP3B_ws -148.2508148 -148.2508148 64.76051099 64.76051099 UP3C -- Closed White Spruce Forest. Site alternate names: 133, LTER #133, FSL-LD-UP3C_ws -148.3306337 -148.3306337 64.72538077 64.72538077 UP2M -- /A. viridis/ was absent in one replicate from the post-fire (UP1C) and mid-succession (UP2C) replicate stands, likely due to competition for water with a dense aspen overstory. Therefore, I substituted these stands with two additional stands where /A. viridis/ was present and which closely resembled and were near to the established BNZ LTER stands.. Site alternate names: -147 -147 65 65 UP1M -- /A. viridis/ was absent in one replicate from the post-fire (UP1C) and mid-succession (UP2C) replicate stands, likely due to competition for water with a dense aspen overstory. Therefore, I substituted these stands with two additional stands where /A. viridis/ was present and which closely resembled and were near to the established BNZ LTER stands.. Site alternate names: -147 -147 65 65 1997-06-03 1998-09-25

unknown

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) 150_NfixSoilTemp.txt We developed this database to describe seasonal trends of rates of nitrogen fixation by A. viridis spp. fruticosa across a boreal forest chronosequence and to elucidate soil temperature controls over rates. 150_NfixSoilTemp.txt 1 \n \n column , http://www.lter.uaf.edu/php/download_data.php?f=/ascii/files/150_NfixSoilTemp.txt Year Year The year at which measurement was made integer yy real Replicate/siteID Replicate/siteID the replicate used in the study identified by the unique site id integer integer the replicate used in the study identified by the unique site id integer julian julian The day at which the meaurement was made julian 0 integer ddd real treenumber treenumber Treenumber: The randomly selected tree at which the measurements were made integer Treenumber: The randomly selected tree at which the measurements were made ARA ARA The index of nitrogen fixation, ARA = acetylene reduction assay Specific ARA expressed as: �mol float �mol real -9999 Missing Value soiltemperature10cm soiltemperature10cm soil temperature as measured under the alder canopy at 10 cm soil depth float celsius real -9999 Missing Value