Nitrogen mineralization was determined on LTER and Sag River tussock tundra using the buried bag method. Yearly bags have been deployed every August since 1990.
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Paired cores (within 15 cm of each other and 5.95cm diameter) of moss dominated inter-tussock were taken from Tussock tundra in the Arctic LTER site near Toolik Lake AK and in tussock tundra near the Sag River DOT maintenance Camp 25 miles Northeast of Toolik. Core length was measured in the field. Live plant material and mineral soil were removed. One core was placed in a polyethylene bag, inserted back in the hole, covered with moss, and flagged. Cores were incubated one year. The other core was taken back to lab for analysis. This core was used as an initial for the bagged core. For NH4-N and NO3-N extractions 100 mls of KCl (2 N KCl) is added to about 20 grams wet weight of homogenized soil. For PO4-P 100 mls of 0.025 N HCl was used for extraction. KCl extracts were shaken for 4 hours while HCl extracts were shaken for only 5 minutes. All extracts were immediately filtered through Whatman No. 42 filter paper. At the Tussock Site 2 bags per block and at the Sag 4 bags per plot were deployed with initials being collected at the same time. Cores were 5.95 cm in diameter and include organic soil only, i.e., no mineral or green, live plants. Notes: This file is complied from the individual year files. Each year's initials are complied in 1986_to_currentgsext.dat. Phosphorus in buried bags was not measured every year.
9Feb98 updated with 97 values. Mar01 updated values to 2000. Jan04 updated file to 2002.Jl
Version 2: Translated metadata into Excel metada worksheet, added attribute table and title. Jan 2006 Jiml
Version 3: Added LTERNET Data Access server proxy for Excel and comma delimited data files.
Version 4: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
Version 5: Added up to 2006 data Jiml
Version 6: Updated units to current standards; Missing values changed to #N/A. Updated metadata form to newer version (without site sheet).CH 24 Jan 2013. Updated to newer metadata with site sheet. CH March 2013.
Version 7: Checked Keywords against the LTER and Arctic LTER list. Jim L 28Jan2014
Version 8: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 27Jan14
Changed Distrubution URL since the LTER network DAS system is being discontinued. JimL 9Apr2015
Version 9: Updated data to 2013 and move to new web site. Jim L May 2016