Title: Effects of invasive insects and fire on energy exchange and evapotranspiration in the New Jersey pine lands
Author: Clark, Kenneth L.; Skowronski, Nicholas; Gallagher, Michael; Renninger, Hedi; Schafer, Karina.;
Source: Agricultural and Forest Meteorology. 166-167: 50-61.
Publication Series: Scientific Journal (JRNL)
Description: We used eddy covariance and meteorological measurements to quantify energy exchange and evapotranspiration (Et) in three representative upland forest stands in the New Jersey Pinelands that were either defoliated by gypsy moth (Lymantria dispar L.) or burned in prescribed fires during the study period. Latent (λE) and sensible heat (H) fluxes were linear functions of available energy, and seasonality had a major effect on the partitioning of available energy into λE and H at each stand. Both defoliation and prescribed fire reduced leaf area, altered the partitioning of available energy, and reduced λE flux compared to undisturbed periods. Summer daily Et averaged 4.2 ± 1.5, 3.3 ± 1.2 and 3.9 ± 1.3 mm day-1 at the oak-, mixed, and pine-dominated stands during undisturbed periods, but only 2.4 ± 0.9 mm day-1 during defoliation at the oak stand in 2007, and 2.4 ± 0.9 and 3.2 ± 0.9 mm day-1 following spring fires at the mixed and pine-dominated stands, respectively. For all years measured, seasonal maximum leaf area index (LAI) explained 82% of the variability in daily Et during the summer at the oak stand, and 80% of the variability at the mixed and pine-dominated stands. Annual Et averaged 614, 493, and 683 mm yr−1 at the oak, mixed, and pine stands, respectively. When averaged across all stands and years, annual Et was 606 mm yr-1, ca. 53.6% of incident precipitation, and similar to long-term averages reported in other studies in the Pinelands. Gypsy moth defoliation potentially reduced Et by ca. 31 mm yr-1 across all upland forests in 2007, resulting in a 7.3% increase in groundwater recharge. Our research indicates that non-stand replacing disturbances can have significant effects on energy partitioning, and can reduce Et at the stand and landscape scales.
Keywords: evapotranspiration, leaf area index, eddy covariance, gypsy moth defoliation, prescribed fire, disturbance
- 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
Clark, Kenneth L.; Skowronski, Nicholas; Gallagher, Michael; Renninger, Hedi; Schafer, Karina. 2012. Effects of invasive insects and fire on energy exchange and evapotranspiration in the New Jersey pine lands. Agricultural and Forest Meteorology. 166-167: 50-61.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility