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Soil and Douglas-fir (Pseudotsuga menziesii) foliar nitrogen responses to variable logging-debris retention and competing vegetation control in the Pacific NorthwestAuthor(s): Robert A. Slesak; Timothy B. Harrington; Stephen H. Schoenholtz
Source: Canadian Journal of Forest Research. 40: 254-264
Publication Series: Scientific Journal (JRNL)
Station: Pacific Northwest Research Station
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DescriptionExperimental treatments of logging-debris retention (0%, 40%, or 80% surface coverage) and competing vegetation control (initial or annual applications) were installed at two sites in the Pacific Northwest following clearcutting Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) stands to assess short term effects on tree N acquisition, soil N supply, and total soil N. Vegetation control treatments began in the first year after harvest, and logging-debris manipulations were installed 2 years after harvest, Annual vegetation control increased foliar N concentration and content in most years at both sites, which was associated with higher available soil N and increased soil water content. Logging-debris retention treatments had no detectable effect on any of the foliar variables or soil available N at either site. There were no treatment effects on total soil N at the site with relatively high soil N, but total soil N increased with logging debris retention when annual vegetation control was applied as the with a low initial soil N pool. Competing vegetation control is an effective means to increase tree N acquisition in the initial years after planting while maintaining soil N pools critical to soil quality. The effect of logging-debris retention on tree N acquisition appears to be limited during early years of stand development, but increased soil N with heavy debris retention at certain sites may be beneficial to tree growth in later years.
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CitationSlesak, Robert A.; Harrington, Timothy B.; Schoenholtz, Stephen H. 2010. Soil and Douglas-fir (Pseudotsuga menziesii) foliar nitrogen responses to variable logging-debris retention and competing vegetation control in the Pacific Northwest. Canadian Journal of Forest Research. 40: 254-264.
Keywordsfoliar analysis, organic matter retention, weed control, site preparation
- Initial response of soil carbon and nitrogen to harvest intensity and competing vegetation control in douglas-fir (Pseudotsuga menziesii) plantations of the Pacific Northwest
- Soil respiration and carbon responses to logging debris and competing vegetation
- Variation in logging debris cover influences competitor abundance, resource availability, and early growth of planted Douglas-fir
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