Effect of krummholz establishment on soil previously occupied by tundra: carbon and nitrogen properties.
Previous work has shown that passage of Englemann spruce (Picea Englemanii) and subalpine fir (Abies lasiocarpa) tree islands across tundra lowers the soil carbon and nitrogen storage capacity of the top 15cm of soil (A horizon) (Pauker and Seastedt 1996). This data forms part of a study which seeks...
Format: | Dataset |
---|---|
Language: | unknown |
Published: |
Niwot Ridge LTER/University of Colorado1560 30th Street, CB 450BoulderCO80309USAlternwt@colorado.edu
2001
|
Subjects: | |
Online Access: | http://hdl.handle.net/10255/dryad.9473 http://metacat.lternet.edu/knb/metacat/knb-lter-nwt.132.2/xml |
id |
ftdryad:oai:v1.datadryad.org:10255/dryad.9473 |
---|---|
record_format |
openpolar |
spelling |
ftdryad:oai:v1.datadryad.org:10255/dryad.9473 2023-05-15T18:39:48+02:00 Effect of krummholz establishment on soil previously occupied by tundra: carbon and nitrogen properties. -105.643 W -105.3753 E 40.0615 N 39.9932 S 1994-06-01 to 1996-08-30 2001 text/plain http://hdl.handle.net/10255/dryad.9473 http://metacat.lternet.edu/knb/metacat/knb-lter-nwt.132.2/xml unknown Niwot Ridge LTER/University of Colorado1560 30th Street, CB 450BoulderCO80309USAlternwt@colorado.edu http://metacat.lternet.edu/knb/metacat/knb-lter-nwt.132.2/xml knb-lter-nwt.132.2 http://hdl.handle.net/10255/dryad.9473 NWT Niwot Ridge LTER Site LTER Colorado C N bulk density carbon d13C d15N krummholz natural isotopic abu nitrogen soil soil bulk density soil carbon soil carbon and nitr tundra dataset 2001 ftdryad 2020-01-01T14:22:02Z Previous work has shown that passage of Englemann spruce (Picea Englemanii) and subalpine fir (Abies lasiocarpa) tree islands across tundra lowers the soil carbon and nitrogen storage capacity of the top 15cm of soil (A horizon) (Pauker and Seastedt 1996). This data forms part of a study which seeks to further examine how changes in carbon storage capacity are associated with changes in soil physical properties. Soils were collected in 1994. We sought to determine whether there were changes in natural abundance of C and N isotopes associated with previously reported changes in C and N content. Any such changes in natural abundance of C and N isotopes may indicate differences in inputs to the ecosystem or differences in ecosystem processes that may account for the differences in N and C content that have been observed. In addition to measuring ratios of natural isotopes of C and N, we also measured C and N contents to provide a comparison with previous studies. In order to convert % N and C values to Kgs of N and C per m2 we used bulk density values, meaned across sampling dates, that had been previously measured for these sites (these raw data are available at: http://culter.colorado.edu/exec/.extracttoolA?krmslblk.ts). When N and C soil contents were considered on a percentage basis, levels at windward sites were significantly lower than those of undisturbed tundra, but levels directly beneath krummholsz were not significantly different from tundra soils. Bulk density was significantly lower under krummholz than other sites. Thus when N and C amounts were expressed on a volume (Kg m2, to a depth of 15cm) , they were significantly lower in both krummholz and windward sites than in undisturbed tundra. D13C values of soils under krummholz were significantly less negative under krummholz than from windward or undisturbed tundra sites. A less negative d13C value is indicative of less discrimination and may be attributable to either vegetation differences or differences in decomposition rates. D13C signatures of krummholz and tundra vegetation were also examined and are available at: http://culter.colorado.edu/exec/.extracttoolA?krmslrts.ts Dataset Tundra Dryad Digital Repository (Duke University) |
institution |
Open Polar |
collection |
Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
NWT Niwot Ridge LTER Site LTER Colorado C N bulk density carbon d13C d15N krummholz natural isotopic abu nitrogen soil soil bulk density soil carbon soil carbon and nitr tundra |
spellingShingle |
NWT Niwot Ridge LTER Site LTER Colorado C N bulk density carbon d13C d15N krummholz natural isotopic abu nitrogen soil soil bulk density soil carbon soil carbon and nitr tundra Effect of krummholz establishment on soil previously occupied by tundra: carbon and nitrogen properties. |
topic_facet |
NWT Niwot Ridge LTER Site LTER Colorado C N bulk density carbon d13C d15N krummholz natural isotopic abu nitrogen soil soil bulk density soil carbon soil carbon and nitr tundra |
description |
Previous work has shown that passage of Englemann spruce (Picea Englemanii) and subalpine fir (Abies lasiocarpa) tree islands across tundra lowers the soil carbon and nitrogen storage capacity of the top 15cm of soil (A horizon) (Pauker and Seastedt 1996). This data forms part of a study which seeks to further examine how changes in carbon storage capacity are associated with changes in soil physical properties. Soils were collected in 1994. We sought to determine whether there were changes in natural abundance of C and N isotopes associated with previously reported changes in C and N content. Any such changes in natural abundance of C and N isotopes may indicate differences in inputs to the ecosystem or differences in ecosystem processes that may account for the differences in N and C content that have been observed. In addition to measuring ratios of natural isotopes of C and N, we also measured C and N contents to provide a comparison with previous studies. In order to convert % N and C values to Kgs of N and C per m2 we used bulk density values, meaned across sampling dates, that had been previously measured for these sites (these raw data are available at: http://culter.colorado.edu/exec/.extracttoolA?krmslblk.ts). When N and C soil contents were considered on a percentage basis, levels at windward sites were significantly lower than those of undisturbed tundra, but levels directly beneath krummholsz were not significantly different from tundra soils. Bulk density was significantly lower under krummholz than other sites. Thus when N and C amounts were expressed on a volume (Kg m2, to a depth of 15cm) , they were significantly lower in both krummholz and windward sites than in undisturbed tundra. D13C values of soils under krummholz were significantly less negative under krummholz than from windward or undisturbed tundra sites. A less negative d13C value is indicative of less discrimination and may be attributable to either vegetation differences or differences in decomposition rates. D13C signatures of krummholz and tundra vegetation were also examined and are available at: http://culter.colorado.edu/exec/.extracttoolA?krmslrts.ts |
format |
Dataset |
title |
Effect of krummholz establishment on soil previously occupied by tundra: carbon and nitrogen properties. |
title_short |
Effect of krummholz establishment on soil previously occupied by tundra: carbon and nitrogen properties. |
title_full |
Effect of krummholz establishment on soil previously occupied by tundra: carbon and nitrogen properties. |
title_fullStr |
Effect of krummholz establishment on soil previously occupied by tundra: carbon and nitrogen properties. |
title_full_unstemmed |
Effect of krummholz establishment on soil previously occupied by tundra: carbon and nitrogen properties. |
title_sort |
effect of krummholz establishment on soil previously occupied by tundra: carbon and nitrogen properties. |
publisher |
Niwot Ridge LTER/University of Colorado1560 30th Street, CB 450BoulderCO80309USAlternwt@colorado.edu |
publishDate |
2001 |
url |
http://hdl.handle.net/10255/dryad.9473 http://metacat.lternet.edu/knb/metacat/knb-lter-nwt.132.2/xml |
op_coverage |
-105.643 W -105.3753 E 40.0615 N 39.9932 S 1994-06-01 to 1996-08-30 |
genre |
Tundra |
genre_facet |
Tundra |
op_relation |
http://metacat.lternet.edu/knb/metacat/knb-lter-nwt.132.2/xml knb-lter-nwt.132.2 http://hdl.handle.net/10255/dryad.9473 |
_version_ |
1766228781669810176 |