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A model for the accumulation of CO2 in the atmosphere has been set up, taking into consideration: (1) the global cycle of nitrogen and phosphorus: (2) the CO2-diffusion in the oceans with means of a multilayer ?ea model; (3) the ability of the oceans to take up CO2; (4) the influence of the CO2-concentrations and of the temperature on this ability; (5) different growth rates for the consumption of fossil fuel including logistic growth; (6) the natural climatic variation.It is shown to be essential to include all these factors. The inclusion of factors (4) and (6), which have been omitted in many previous publications, is very essential to the model. 相似文献
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Damjan Demšar Sašo Džeroski Thomas Larsen Jan Struyf Jørgen Axelsen Marianne Bruus Pedersen Paul Henning Krogh 《Ecological modelling》2006
In agricultural soil, a suite of anthropogenic events shape the ecosystem processes and populations. However, the impact from anthropogenic sources on the soil environment is almost exclusively assessed for chemicals, although other factors like crop and tillage practices have an important impact as well. Thus, the farming system as a whole should be evaluated and ranked according to its environmental benefits and impacts. Our starting point is a data set describing agricultural events and soil biological parameters. Using machine learning methods for inducing regression and model trees, we produce empirical models able to predict the soil quality from agricultural measures in terms of quantities describing the soil microarthropod community. We are also interested in discovering additional higher level knowledge. In particular, we have identified the most important factors influencing the population densities of springtails and mites and their biodiversity. We also identify to which agricultural actions different microarthropods react distinctly. To obtain this higher level knowledge, we employ multi-objective regression trees. 相似文献
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H. Friege 《Environmental Sciences Europe》2009,21(6):487-489
In the following articles, the revision of the European regulations on the admission and use of pesticides is reported. Authors from the German environmental protection agency, the producers of chemicals for crop protection, and of a non-governmental organisation clarify their views on the revision with respect to a number of questions. 相似文献