Objectifying thematic, spatial and temporal aspects of vegetation mapping for monitoring
Ad hoc decisions during fieldwork reduce the accuracy and reliability of vegetation maps. A method is proposed to objectify vegetation (thematic aspects) mapping (spatial aspects) for monitoring (temporal aspects). The most accurate and reliable description of the vegetation is a list of all plant species found within a plot. Therefore, the proposed method is an interpolation of a spatially representative sample of permanent plots combined with aerial photo interpretation. The method is objective because surveyors do not have to make decisions during fieldwork based on their personal judgement. Moreover, it is flexible, because the classification and interpolation methods can be adapted to specific views or needs depending on the aim of a study.
The method was applied to an area in the north of the Netherlands in 1998. A sampling design with a density of 1 plot/ha was used, and interpolated with a perpendicular bisector. In 2002, the number of plots/ha was doubled. The influence of sample density on the mapping results was studied because it is an important decision to be made before fieldwork. Two plots/ha seem to be sufficient in order to obtain reliable information on patterns of plant species composition and vegetation types of the area, and their change over time. However, in patches where vegetation varies on a very small spatial scale this plot density was insufficient.
KeywordsAccuracy Objectivity Permanent plots Plant species Sampling design Sequential maps Vegetation mapping
Differential Global Positioning System
Geographical Information System
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- Bakker, J.P. 1979. Vegetation science and nature conservation. In: M.J.A. Werger (ed.), The Study of Vegetation. Junk, Den Haag, the Netherlands.Google Scholar
- Burrough, P.A. 1986. Principals of Geographical Information Systems for Land Resources Assessment, Clarendon, Oxford.Google Scholar
- Burrough, P.A. 1987. Spatial aspects of ecological data. In: R.H.G. Jongman, C.J.F. ter Braak and O.F.R. van Tongeren (eds.), Data Analysis in Community and Landscape Ecology. Pudoc, Wageningen, the Netherlands.Google Scholar
- De Vlas, J., and J.M. Marquenie. 2003. The Impact of Subsidence and Sea Level Rise in the Wadden Sea: Prediction and Field Verification, NAM, Assen, the Netherlands.Google Scholar
- Dirkse, G.M. 1998. The validity of general purpose flora-based classification of vegetation, PhD thesis, University of Utrecht, the Netherlands.Google Scholar
- Droesen, W.J. 1999. Spatial modelling and monitoring of natural landscapes: with cases in the Amsterdam Waterworks Dunes, PhD thesis, Wageningen Agricultural University, the Netherlands.Google Scholar
- Ellenberg, H. 1991. Zeigerwerte der Gefäszpflanzen (ohne Rubus). Scripta Geobotanica 18:9–166.Google Scholar
- Fortin, M., P. Drapeau and P. Legendre. 1989. Spatial autocorrelation and sampling design in plant ecology. Vegetatio 83:209–222.Google Scholar
- Hill, M.O. 1979. TWINSPAN,A FORTRAN program for arranging multivariate data into an ordered two-way table by classification of the individuals and attributes, Cornell University, Ithaca.Google Scholar
- Huston, M.A. 1994. Biological Diversity; The Coexistence of Species on Changing Landscapes, Cambridge University Press, Cambridge.Google Scholar
- Janssen, J.A.M. 2001. Monitoring of salt-marsh vegetation by sequential mapping. PhD thesis, University of Amsterdam.Google Scholar
- Kent, M. and P. Coker. 1992. Vegetation Description and Analysis, a Practical Approach, Wiley, Chichester.Google Scholar
- Legendre, P. and L. Legendre. 1998. Numerical Ecology, Elsevier, Amsterdam.Google Scholar
- Marsman B.A. and J.J. De Gruijter. 1986. Quality of soil maps, A comparison of survey methods in a sandy area. Soil Survey Papers, no 15. Soil Survey Institute, Wageningen, the Netherlands.Google Scholar
- Mueller-Dombois, D. and H. Ellenberg. 1974. Aims and Methods of Vegetation Ecology, Wiley, New York.Google Scholar
- Oude Voshaar, J.H. 1981. Steekproefmethoden in het onderzoek naar verspreiding van perceelsvormen: oppervlakteschatting van mozaiken via steekproefpunten, IWIS-TNO, Wageningen, the Netherlands.Google Scholar
- Schaminée, J.H.J., A.H.F. Stortelder and V. Westhoff. 1995. De vegetatie van Nederland, Deel 1. Inleiding tot de plantensociologie – grondslagen, methoden en toepassingen. Opulus, Leiden.Google Scholar
- Schouten M. and M. van Ool. 2003. Werken met waarden bij Staatsbosbeheer. Natuurbehoud als beschavingsnorm. Jaarverslag Staatsbosbeheer 2002.Google Scholar
- Van Holst, A.F. 1990. Bodemkartering en bodemkaarten. In: H. de Bakker and W.P. Locher (eds), Bodemkunde van Nederland. Deel 2, bodemgeografie. Malmberg, Den Bosch, the Netherlands.Google Scholar
- Van der Meijden, R., 1996. Heukels’ Flora van Nederland, Wolters-Noordhoff, Groningen, the Netherlands.Google Scholar
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