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Temporal and spatial changes in soil carbon and nitrogen after clearcutting and burning of an old-growth Douglas-fir forest

Author: Joseph A Antos
Publisher: Portland, Or. : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, [2003]
Series: Research paper PNW, 552.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
We used 135 permanent plots (4 m2) nested within 15 blocks (121 m2) to quantify changes in concentration and spatial variation of carbon (C) and nitrogen (N) in the mineral soil (0- to 10-cm depth) after logging and broadcast burning of an old-growth, Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forest. Before harvest, surface soils averaged total C of 7.2 percent, total N of 0.19 percent, extractable NH4 +-N  Read more...
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Additional Physical Format: Online version:
Temporal and spatial changes in soil carbon and nitrogen after clearcutting and burning of an old-growth Douglas-fir forest.
Portland, Or. : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, [2003]
(OCoLC)623502250
Material Type: Government publication, National government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: Joseph A Antos
OCLC Number: 52761802
Notes: Cover title.
"June 2003."
Description: 19 pages : illustrations ; 28 cm.
Series Title: Research paper PNW, 552.
Responsibility: Joseph A. Antos [and others].

Abstract:

We used 135 permanent plots (4 m2) nested within 15 blocks (121 m2) to quantify changes in concentration and spatial variation of carbon (C) and nitrogen (N) in the mineral soil (0- to 10-cm depth) after logging and broadcast burning of an old-growth, Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) forest. Before harvest, surface soils averaged total C of 7.2 percent, total N of 0.19 percent, extractable NH4 +-N of 5.2 Âg/g, extractable NO3 --N of 0.19 Âg/g, and pH of 5.3. Samples collected 9 months after burning showed a 26-percent decline in concentration of total C, but a 5-percent increase in concentration of total N. Concentrations of extractable mineral N (NH4 +-N + NO3 --N) increased to five time initial levels but returned to preharvest levels 1 year later. The coefficient of variation in extractable mineral N more than doubled after burning. Two and 3 years after burning, extractable N showed a significant and increasingly strong negative relation with plant biomass suggesting that N concentration was measurably reduced by plant uptake. Most variation in soil C and N before harvest occurred at small spatial scales (within and among 2- by 2-m plots); logging and broadcast burning had little effect on this pattern.

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