Savanna–forest hysteresis in the tropics

@article{Sternberg2001SavannaforestHI,
  title={Savanna–forest hysteresis in the tropics},
  author={Leonel Da Silveira Sternberg},
  journal={Global Ecology and Biogeography},
  year={2001},
  volume={10},
  pages={369-378}
}
  • L. Sternberg
  • Published 1 July 2001
  • Environmental Science
  • Global Ecology and Biogeography
A simple dynamic model relating forest area in a region, its contribution to dry season precipitation and the effect on its own establishment was developed. The model equation shows hysteresis between forest and savannas as a function of imported dry season precipitation. Regions are either dominated by forests or savannas, with each ecosystem showing stability despite changes in imported dry season precipitation. Deforestation beyond a certain threshold value, however, could cause a collapse… 

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References

SHOWING 1-10 OF 37 REFERENCES

The role of deep roots in the hydrological and carbon cycles of Amazonian forests and pastures

DEFORESTATION and logging transform more forest in eastern and southern Amazonia than in any other region of the world1–3. This forest alteration affects regional hydrology4–11 and the global carbon

Tree Spacing and Coexistence in Semiarid Savannas

A spatiotemporal model based on a cellular automata approach was constructed to identify the factors and processes crucial to the coexistence of trees and grass, and their effects on the spatial arrangement of trees in arid and semiarid savannas and provides a novel insight into the understanding of savanna dynamics.

Amazonia during the last glacial

A Long Pollen Record from Lowland Amazonia: Forest and Cooling in Glacial Times

A continuous pollen history of more than 40,000 years was obtained from a lake in the lowland Amazon rain forest. Pollen spectra demonstrate that tropical rain forest occupied the region continuously

Contribution of transpiration to forest ambient vapour based on isotopic measurements

Using a simple isotope mixing model, we evaluated the relative proportion of water vapour generated by plant transpiration and by soil evaporation at two sites in the Amazon basin. Sampling was

Deep Soil Moisture Storage and Transpiration in Forests and Pastures of Seasonally-Dry Amazonia

To assess the impacts of land-use changes on plant-available water (PAW) and evapotranspiration (ET), volumetric water content (VWC) was measured to 8 m beneath three, adjacent ecosystems for four

Cooling of Tropical Brazil (5�C) During the Last Glacial Maximum

A 30,000-year paleotemperature record derived from noble gases dissolved in carbon-14-dated ground water indicates that the climate in lowland Brazil (Piaui Province, 7�S, 41.5�W; altitude, 400

Recycling of water in the Amazon Basin: An isotopic study

The oxygen-18 content of precipitation in the Amazon basin is characterized by a very small inland gradient, 0.75 × 10−3 ‰ km−1. This is a consequence of the large contribution of reevaporated

Late Quaternary Vegetation and Climate Change in the Amazon Basin Based on a 50,000 Year Pollen Record from the Amazon Fan, ODP Site 932

Abstract Hemipelagic sediments from the Amazon deep-sea fan, ODP Site 932 (5° 12.7′N, 47° 1.8′W), and continental shelf provide a 50,000-yr-long pollen record of Amazon Basin vegetation. The age