Skip to Main Content
Stand density, drought and herbivory constrain ponderosa pine regeneration pulseAuthor(s): Thomas E. Kolb; Kelsey Flathers; John B. Bradford; Caitlin Andrews; Lance A. Asherin; W. Keith Moser
Source: Canadian Journal of Forest Research. doi: 10.1139/cjfr-2019-0248.
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
Download Publication (2.0 MB)
DescriptionTrees in dry forests often regenerate in episodic pulses when wet periods coincide with ample seed production. Factors leading to success or failure of regeneration pulses are poorly understood. We investigated the impacts of stand thinning on survival and growth of the 2013 cohort of ponderosa pine (Pinus ponderosa Douglas ex P. Lawson & C. Lawson) seedlings in northern Arizona, United States.Wemeasured seedling survival and growth over the first five growing seasons after germination in six stand basal areas (BAs; 0, 7, 14, 23, 34, and 66 (unthinned)m2·ha-1) produced by long-term experimental thinnings. Five-year survival averaged 2.5% and varied among BAs. Mean survival duration was longer in intermediate BAs (11 to 16 months) than in clearings and high BAs (5 months). The BAs of 7, 14, and 23m2·ha-1 had >2600 5-year-old seedlings·ha-1. In contrast, regeneration was lower in the clearing (666 seedlings·ha-1) and failed completely in the 34 m2·ha-1 and unthinned treatments. Seedling survival was highest during wet years and lowest during drought years. Many surviving seedlings had no net height growth between years 4 and 5 because of stem browsing. Results indicate that natural regeneration of ponderosa pine is influenced by stand BA, drought, herbivory, and interactions between extreme climatic events.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
CitationKolb, Thomas E.; Flathers, Kelsey; Bradford, John B.; Andrews, Caitlin; Asherin, Lance A.; Moser, W. Keith. 2020. Stand density, drought and herbivory constrain ponderosa pine regeneration pulse. Canadian Journal of Forest Research. doi: 10.1139/cjfr-2019-0248.
KeywordsPinus ponderosa, thinning, tree seedling establishment, seedling mortality, stand management
- Long-term thinning alters ponderosa pine reproduction in northern Arizona
- Persistent effects of fire severity on ponderosa pine regeneration niches and seedling growth
- Restoring ponderosa pine in the Davis Mountains of west Texas: impacts of planting practices on seedling survival
XML: View XML