Title: Modeling landscape net ecosystem productivity (LandNEP) under alternative management regimes
Author: Euskirchen, Eugenie S.; Chen, Jiquan; Li, Harbin; Gustafson, Eric J.; Crow, Thomas R.;
Source: Ecological Modelling 154 (2002) 75?91
Publication Series: Scientific Journal (JRNL)
Description: Forests have been considered as a major carbon sink within the global carbon budget. However, a fragmented forest landscape varies significantly in its composition and age structure, and the amount of carbon sequestered at this level remains generally unknown to the scientific community. More precisely, the temporal dynamics and spatial distribution of net ecosystem productivity (NEP) in a mosaic are dependent on ecosystem type and the chronosequence of the ecosystem in the landscape. In this study, we developed a model, LandNEP, to follow the change in NEP by ecosystem and chronosequence. The model creates user-defined hypothetical landscape mosaics of ecosystem and age over a given number of simulation years. It then calculates NEP and biomass for each ecosystem and over the entire landscape based on a distribution function, and any disturbances that have occurred within a landscape at a given year. We simulated three different scenarios and a sensitivity analysis within a hypothetical landscape. Based on these scenarios, we were able to show that theoretically, timber harvest strategies requiring rotations that go beyond the time of an ecosystem?s maximum NEP will ultimately yield the greatest cumulative NEP value. Furthermore, the sensitivity analysis demonstrated that increasing the disturbance interval could switch an ecosystem from acting as a net carbon source to acting as a net carbon sink. These results suggest that carbon losses within a managed forested landscape could be mitigated by permitting the ecosystem to reach its maximum as a net carbon sink before harvesting timber. Therefore, alternative management regimes play a leading role in determining to what extent a landscape sequesters carbon.
Keywords: Net ecosystem productivity (NEP), carbon flux, Landscape, Disturbance, Management
- 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
Euskirchen, Eugenie S.; Chen, Jiquan; Li, Harbin; Gustafson, Eric J.; Crow, Thomas R. 2002. Modeling landscape net ecosystem productivity (LandNEP) under alternative management regimes. Ecological Modelling 154 (2002) 75?91
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility