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原文連結
論文資訊
- 類型：已發表論文
- 日期：2014-10-24
摘要
Recent empirical and theoretical analyses have suggested that biomes could correspond to alternative equilibrium states; one such example is the transition between 森林, savanna and treeless states. Fire supposes to be a key functional component of savanna ecosystems and is a powerful predictor of tree cover that can differentiate between 森林 and savanna ecosystems. Interestingly, empirical evidence suggests that fire occurrence drops at a threshold tree cover near 40%. Since savannas are ecosystems characterized by a discontinuous tree canopy cover immersed in a continuous grass layer a 40% of tree cover implies around 60% cover of grasses, which are the flammable component of this ecosystem. In this article, we hypothesize that the observed common pattern of 40% tree cover versus 60% in gra
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