Determining ecotope type and testing the consistency of ecologically homogeneous species groups
Bepaling ecotooptype en toetsing indeling in ecologische soortengroepen van vegetaties
26 May 2012, PDF |
262 pages |
Runhaar J , Zelfde M van 't - Groen CLG, Alkemade JRM (eds)
RIVM Report 408657009
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.