| Title: |
Soil nitrogen cycling in a boreal hardwood forest in relation to the phenolic compound bearing species Ledum palustre
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| Contacts: |
Valentine, David
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| Abstract: |
Ledum palustre (Labrador tea) is a late successional evergreen shrub widely distributed in boreal ecosystems that readily leaches high concentrations of soluble phenolic compounds into water. We selected this species in order to study whether leaf leachates could be responsible for the effects of plant canopy on N cycling under natural conditions. Organic matter content, soil respiration and net N mineralization were measured in organic and mineral soil horizons and gross N mineralization was also measured in mineral soils sampled underneath L. palustre in a hardwood forest dominated by Populus tremuloides and Betula neoalaskana. Soils were amended with L. palustre litter leachates and incubated in the laboratory. Because mineral soil is also influenced by the overlying organic horizon we also characterized some simple indices of the organic horizon carbon quality (lignin, cellulose and condensed tannins) to look for differences in likely decomposability.
Our objectives were i) to determine whether L. palustre presence and L. palustre leachates addition changed soil N availability, and ii) to determine the specific N cycling processes that were affected, including changes in mineralization, nitrification or immobilization. We wanted to know whether L. palustre leachates could be a mechanism through which plant presence would impact N cycling.
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| Keywords: |
Ledum palustre, nitrogen cycling, nitrogen mineralization, organic carbon, organic nitrogen, phenolic compounds, |
| Categories: |
Biogeochemistry
|
| Study Period: |
Aug 1, 1999 to Aug 31, 1999
|
| Bounding Box: |
West longitude: -147.4745274°
North latitude: 65.16908333°
East longitude: -147.470667°
South latitude: 65.16769474°
|
| Site References: |
MH-C1 --
MH-C2 --
MH-C3 --
|
| Data Columns: |
| Column |
Name |
Units |
Type |
| 1 |
Site type |
|
string |
| 2 |
Site # |
|
integer |
| 3 |
O/M |
|
|
| 4 |
OM Depth |
centimeter |
float |
| 5 |
NDF |
|
float |
| 6 |
ADF |
|
float |
| 7 |
Hemicellulose |
|
float |
| 8 |
Cellulose |
|
float |
| 9 |
Lignin |
|
float |
| 10 |
tannins |
|
float |
| 11 |
pH |
|
float |
| 12 |
Organic C |
|
float |
| 13 |
Organic N |
|
float |
| 14 |
C/N |
|
|
| 15 |
initial NH4+ |
|
float |
| 16 |
initial NO3- |
|
float |
| 17 |
final NH4+ control |
|
float |
| 18 |
final NH4+ leachate |
|
float |
| 19 |
final NO3- Control |
|
float |
| 20 |
final NO3- leachate |
|
float |
| 21 |
N mineralization Control |
|
float |
| 22 |
N mineralization leachate |
|
float |
|
| Data File(s): |
172_1702_Castells_et_al_dataset.txt
|
| Supplemental Files: |
|
| Metadata Formats: |
|
| Public Release: |
Aug 13, 2003
|
| Publications: |
Castells, E., J. Penuelas and D. W. Valentine. 2003. Influence of the phenolic compound bearing species Ledum palustre on soil N cycling in a boreal hardwood forest. Plant and Soil 251:155-166.
|
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The Bonanza Creek LTER, including this website, is supported by the
National Science Foundation through awards
DEB-0620579,
DEB-0423442,
DEB-0080609,
DEB-9810217,
DEB-9211769,
DEB-8702629
and by the USDA Forest Service, Pacific Northwest Research Station through agreement number RJVA-PNW-01-JV-11261952-231.
Any opinions, findings, conclusions, or recommendations expressed in the
material are those of the author(s) and do not necessarily reflect
the views of the supporting agencies or the program as a whole.
© Bonanza Creek LTER, 2009.
Last modified 23-Nov-09
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Disclaimer
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