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| Witte, J.P.M.; Meijden, R. van der. |
| A method is presented for the assessment of the botanical quality in the Netherlands. This quality is derived from the large national database FLORBASE which contains per square km, data on the presence of indigenous plant species in the period 1975-1990 (in all 4.5 million records). 7 Species were grouped into 28 ‘ecological groups’ according to the ‘ecotope classification’ system. 21 According to the fact whether a species is assigned to several ecological groups or a single one, it gets an indication-value ranging from 1/3 up to 1. From each square kilometer the indication-values are counted for each ecological group to form a score. Scores of different ecological groups are not mutually comparable because, for instance, each ecological group has its... |
| Tipo: Article / Letter to the editor |
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| Ano: 1995 |
URL: http://www.repository.naturalis.nl/record/527666 |
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| Witte, J.P.M.; Meuleman, A.F.M.; Van der Schaaf, S.; Raterman, B.. |
| One of the branches of eco-hydrological research deals with relationships of hydrology and biodiversity, especially the relation between hydrology and the occurrence of individual plant species and plant communities. Every plant has specific demands on its environment, such as temperature, light and the availability of water, oxygen and nutrients. These demands are called the ‘environmental site conditions’ of species. Because of differences in site conditions between plant species, species have an indicator value for the state of the environment. Indicator values can be used to assess which species are to be expected on certain soil types and under which hydrological conditions, but also which species will appear or disappear after certain measures have... |
| Tipo: Conference proceedings |
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| Ano: 2005 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/901 |
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