科研之友
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摘要
The advance of deforestation worldwide necessitates the development of models that facilitate reforestation, especially in areas where access to water is limited. To this end we have developed a model based on two ODEs, one for soil moisture (loamy sand type) and the other for plant biomass of Pinus halepensis. These conditions are typical of Southeastern Spain. %26lt;br%26gt;In an arid climate system the model has a single stable equilibrium point, corresponding to the absence of biomass. In wet weather the system has again a single stable equilibrium point, corresponding now to the maximum biomass. Between these two extremes, i.e. a semi-arid climate, the system has three equilibria, two stable (one without biomass and the other with maximum biomass) and one unstable. %26lt;br%26gt;This model allows exploring strategies to facilitate the reforestation of semiarid areas. According to it, increase in the extinction coefficient of light and the density of leaves facilitate reforestation, while increases in the maximum evaporation rate, the mortality rate (litter formation) and the thickness of the leaves complicate reforestation. Maximum production has a more complex behavior.
- 出版日期2013-9-24
