Principles of ecosystem sustainability
- Univ. of California, Berkeley, CA (United States)
- Gunma Univ., Maebashi (Japan)
Many natural ecosystems are self-sustaining, maintaining an characteristic mosaic of vegetation types of hundreds to thousands of years. In this article we present a new framework for defining the conditions that sustain natural ecosystems and apply these principles to sustainability of managed ecosystems. A sustainable ecosystem is one that, over the normal cycle of disturbance events, maintains its characteristics diversity of major functional groups, productivity, and rates of biogeochemical cycling. These traits are determined by a set of four {open_quotes}interactive controls{close_quotes} (climate, soil resource supply, major functional groups of organisms, and disturbance regime) that both govern and respond to ecosystem processes. Ecosystems cannot be sustained unless the interactive controls oscillate within stable bounds. This occurs when negative feedbacks constrain changes in these controls. For example, negative feedbacks associated with food availability and predation often constrain changes in the population size of a species. Linkages among ecosystems in a landscape can contribute to sustainability by creating or extending the feedback network beyond a single patch. The sustainability of managed systems can be increased by maintaining interactive controls so that they form negative feedbacks within ecosystems and by using laws and regulations to create negative feedbacks between ecosystems and human activities, such as between ocean ecosystems and marine fisheries. Degraded ecosystems can be restored through practices that enhance positive feedbacks to bring the ecosystem to a state where the interactive controls are commensurate with desired ecosystem characteristics. The possible combinations of interactive controls that govern ecosystem traits are limited by the environment, constraining the extent to which ecosystems can be managed sustainably for human purposes. 111 refs., 3 figs., 2 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 468703
- Journal Information:
- American Naturalist, Vol. 148, Issue 6; Other Information: PBD: Dec 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Spatiotemporal dynamics of ecosystem fires and biomass burning-induced carbon emissions in China over the past two decades
Files and scripts to support manuscript Shuman et al 2023 FATES-SPITFIRE ecosystem assembly across tropics