Bepaling ecotooptype en toetsing indeling in ecologische soortengroepen van vegetaties
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Series / Report no.
Open Access
Type
Report
Language
nl
Date
2003-08-19
Research Projects
Organizational Units
Journal Issue
Title
Bepaling ecotooptype en toetsing indeling in
ecologische soortengroepen van vegetaties
Translated Title
Determining ecotope type and testing the
consistency of ecologically homogeneous species
groups
Published in
Abstract
In Nederland zijn twee modellen in gebruik om op
nationale schaal de effecten van milieuveranderingen op de vegetatie in te
schatten: DEMNAT en SMART/MOVE. DEMNAT richt zich vooral op de effecten van
grondwaterveranderingen op natte en vochtige systemen, terwijl SMART/MOVE
zich vooral richt op de gecombineerde effecten van verdroging, verzuring en
vermesting van alle ecosystemen. Er is een overlap tussen beide modellen.
Daarom is besloten tot verdere afstemming om mogelijk op termijn tot
integratie te komen. Een eerste stap naar afstemming is het gebruik maken
van dezelfde basisgegevens. Hiervoor is een grote dataset samengesteld die
bestaat uit 170.000 opnamen, waar zowel de responsmodule MOVE van afgeleid
werd als de ecotopenindeling van DEMNAT. Dit rapport beschrijft hoe deze
gegevens zijn gebruikt om de indeling van soorten in ecologische
soortengroepen te verbeteren. De dataset bevat opnamen uit alle delen van
het land, maar de dichtheid van opnamen is in sommige delen groter dan in
andere delen. De data, waarop een eerste indeling is gebaseerd, zijn
vergeleken met literatuurgegevens. Met gevonden inconsistenties tussen
indeling en literatuur, die vooral veroorzaakt werden door heterogeniteit
van opnamen en het voorkomen van meerdere vegetatielagen in een opname, b.v.
oppervlakkig wortelende mossen en diep wortelende struiken, is rekening
gehouden bij de analyse. Deze procedure leidde tot een groot aantal
aanbevelingen ter verbetering van de indeling in ecologische
soortengroepen.
Two models, DEMNAT and SMART/MOVE, are in use in the Netherlands to evaluate the effects of changes in environmental factors on the vegetation. Whereas DEMNAT focuses mainly on changes in groundwater dynamics in moist and wet ecosystems, SMART/MOVE has been developed to evaluate the combined effects of acidification, lowering of the groundwater and eutrophication in all ecosystems. There is a large overlap in the two models. One of the ways to bring these models more in tune with each other is to use the same basic data. This was the reasoning behind the creation of a common file with vegetation relevees to be used both to revise the classification of ecological species groups (defined as species with common environmental preferences) and to ascertain the MOVE responses. This report describes how the data were used to revise the classification of species in ecological species groups. The study uses a large data set of vegetation relevees (up to 170,000). Although the data set contains data from all parts of the country, the sample frequency in some parts was much higher than in other parts. The data were thoroughly analysed and compared with data from the literature. The inconsistencies found, mostly due to heterogeneity of the sites or the existence of more than one layers (e.g. superficial rooting mosses and deep rooting shrubs have a completely different microhabitat), were accounted for in the analyses. This procedure resulted in a large set of recommended changes in the ecological species groups.
Two models, DEMNAT and SMART/MOVE, are in use in the Netherlands to evaluate the effects of changes in environmental factors on the vegetation. Whereas DEMNAT focuses mainly on changes in groundwater dynamics in moist and wet ecosystems, SMART/MOVE has been developed to evaluate the combined effects of acidification, lowering of the groundwater and eutrophication in all ecosystems. There is a large overlap in the two models. One of the ways to bring these models more in tune with each other is to use the same basic data. This was the reasoning behind the creation of a common file with vegetation relevees to be used both to revise the classification of ecological species groups (defined as species with common environmental preferences) and to ascertain the MOVE responses. This report describes how the data were used to revise the classification of species in ecological species groups. The study uses a large data set of vegetation relevees (up to 170,000). Although the data set contains data from all parts of the country, the sample frequency in some parts was much higher than in other parts. The data were thoroughly analysed and compared with data from the literature. The inconsistencies found, mostly due to heterogeneity of the sites or the existence of more than one layers (e.g. superficial rooting mosses and deep rooting shrubs have a completely different microhabitat), were accounted for in the analyses. This procedure resulted in a large set of recommended changes in the ecological species groups.
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Publisher
Sponsors
RIVM
RIZA
Alterra
EC-LNV