Title: Survival analysis for a large scale forest health issue: Missouri oak decline
Author: Woodall, C.W.; Grambsch, P.L.; Thomas, W.; Moser, W.K.
Source: Environmental Monitoring and Assessment (2005) 108: 295-307
Publication Series: Journal/Magazine Article (JRNL)
Description: Survival analysis methodologies provide novel approaches for forest mortality analysis that may aid in detecting, monitoring, and mitigating of large-scale forest health issues. This study examined survivor analysis for evaluating a regional forest health issue - Missouri oak decline. With a statewide Missouri forest inventory, log-rank tests of the effects of covariates on the survivor function and equality of the survivor function among classes were conducted for selected oak species.
Additionally, hazard functions were determined for diameter classes for damaged and undamaged oaks. Results indicate that mortality appears to vary significantly among some inventory classes such as oak species, but not among other classes such as ownership class. Indicators of individual tree vigor (i.e., crown class and ratio) were more significant predictors of oak tree mortality than site/stand attributes (i.e., density and aspect). Finally, results indicate that even fast-growing oak trees are at high risk of mortality if damaged by disease. Survival analyses, such as those applied in this study, may enable testing of forest health hypotheses using large-scale inventories. In the context of Missouri`s oak forest decline, study results suggest management efforts should focus on limiting the spread of disease damage, increasing the vigor of residual trees, and emphasizing small trees when developing stand prescriptions.
Keywords: Hazard function, life-table, Missouri, oak decline, survival analysis
- 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.
- This publication may be available in hard copy. Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
XML: View XML
Woodall, C.W.; Grambsch, P.L.; Thomas, W.; Moser, W.K. 2005. Survival analysis for a large scale forest health issue: Missouri oak decline. Environmental Monitoring and Assessment (2005) 108: 295-307
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility