Skip to Main Content
The effects of drought and disturbance on the growth and developmental instability of loblolly pine (Pinus taeda L.)Author(s): John H. Graham; Jeffrey J. Duda; Michelle L. Brown; Stanley Kitchen; John M. Emlen; Jagadish Malol; Elizabeth Bankstahl; Anthony J. Krzysik; Harold Balbach; D. Carl Freeman
Source: Ecological Indicators. 20: 143-150.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
View PDF (416.8 KB)
DescriptionEcological indicators provide early warning of adverse environmental change, helping land managers adaptively manage their resources while minimizing costly remediation. In 1999 and 2000, we studied two such indicators, growth and developmental instability, of loblolly pine (Pinus taeda L.) influenced by mechanized infantry training at Fort Benning, Georgia. Disturbed areas were used for military training; tracked and wheeled vehicles damaged vegetation and soils. Highly disturbed sites had fewer trees, diminished ground cover, warmer soils in the summer, and more compacted soils with a shallower Ahorizon. We hypothesized that disturbance would decrease the growth of needles, branches, and tree rings, increase the complexity of tree rings, and increase the developmental instability of needles. Contrary to our expectations, however, disturbance enhanced growth in the first year of the study, possibly by reducing competition. In the second year, a drought reduced growth of branches and needles, eliminating the stimulatory effect of disturbance. Growth-ring widths increased with growing-season precipitation, and decreased with growing-season temperature over the last 40 years. Disturbance had no effect on tree-ring complexity, as measured by the Hurst exponent. Within-fascicle variation of current-year needle length, a measure of developmental instability, differed among the study populations, but appeared unrelated to mechanical disturbance or drought.
- You may send email to firstname.lastname@example.org 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.
CitationGraham, John H.; Duda, Jeffrey J.; Brown, Michelle L.; Kitchen, Stanley; Emlen, John M.; Malol, Jagadish; Bankstahl, Elizabeth; Krzysik, Anthony J.; Balbach, Harold; Freeman, D. Carl. 2012. The effects of drought and disturbance on the growth and developmental instability of loblolly pine (Pinus taeda L.). Ecological Indicators. 20: 143-150.
Keywordsdisturbance, loblolly pine, drought, indicators, developmental instability
- Seasonal branch and fine root growth of juvenile loblolly pine five growing seasons after fertilization
- Branch growth and gas exchange in 13-year-old loblolly pine (Pinus taeda) trees in response to elevated carbon dioxide concentration and fertilization
- Crown characteristics of juvenile loblolly pine 6 years after application of thinning and fertilization
XML: View XML