Skip to Main Content
Stand structure and growth of Abies magnifica responded to five thinning levels in northeastern California, USAAuthor(s): Jianwei Zhang; William W. Oliver
Source: Forest Ecology and Management 223:275-283
Publication Series: Scientific Journal (JRNL)
View PDF (420.09 KB)
DescriptionA 60-year old red fir stand with 23,950 stems per ha was thinned to five stand densities. Thinning occurred in 1972, 1976, and 1980. Height, DBH, and crown characteristics were measured seven times at four- to seven-year intervals from 1972 to 2002. Tree rings were measured retrospectively to determine growth of individual years. Periodic annual increment (PAI) was analyzed for quadratic mean diameter (QMD), height, crown volume, and basal area per ha. We found significant difference for all variables among thinning levels and among measurement periods (P<0.002). Trees in heavily thinned plots grew more in height, DBH, and crown volume than trees in lightly thinned plots. The trends were true for the eight tallest trees per plot (=100 trees per ha) for height and DBH. Yet, both total and PAI stand basal area were greater in the lightly thinned plots than in the heavily thinned plots. Thinning intensity accelerated the transformation in diameter distribution from either reverse ‘J’ or skewed shape to a bell-shape. In addition, the heavier thinned plots increased stand vigor and health as indicated by less snow damage and stem deformities than the lighter thinned plots. Annual diameter growth was significantly related to average minimum temperature during the growing season. We conclude that thinning young red fir stands to a wide spacing will enhance stand development and minimize damage to the residual trees.
- 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.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationZhang, Jianwei; Oliver, William W. 2006. Stand structure and growth of Abies magnifica responded to five thinning levels in northeastern California, USA. Forest Ecology and Management 223:275-283.
Keywordsgrowth response, minimum temperature, red fir, stand structure, thinning
- Treatment duration and time since disturbance affect vegetation development in a young California red fir plantation
- A forest health inventory assessment of red fir (Abies magnifica) in upper montane California
- Herbs and brush on California red fir regeneration sites: a species and frequency sampling
XML: View XML