Phytosociology


Phytosociology is the branch of science which deals with plant communities, their composition and development, and the relationships between the species within them. A phytosociological system is a system for classifying these communities.

History

Rooted in phytogeography and as such considered sometimes a field of geobotany, phytosociology emerged simultaneously in Poland, France and Sweden, but hardly penetrated into the Anglo-Saxon world, where the continuum concept of community prevailed, opposed to the concept of plant associations.
The term "phytosociology" was coined in 1896 by Józef Paczoski.

Traditions of Classifications

There are five classification schools in phytosociology:
The aim of phytosociology is to achieve a sufficient empirical model of vegetation using plant taxa combinations that characterize univocally vegetation units. Vegetation units as understood by phytosociologists may express largely abstract vegetation concepts or actual readily recognizable vegetation types. Such conceptual units are called "syntaxa" and can be set in a hierarchy system called "synsystem" or syntaxonomic system. The act of creation, amelioration or adjusting the synsystem is called "syntaxonomy". Therefore, the syntaxonomic system is putatively a sufficient empirical representation of vegetation of a given territory. An International Code of Phytosociological Nomenclature, issuing the rules for naming "syntaxa" exists and its use has increased among vegetation scientists.

Association model

The basic unit of syntaxonomy is the "association", defined by its characteristic combination of plant taxa, habitat features, physiognomy, biogeographical area, role in ecological succession, historical and paleo-biogeographical relationships. The association is sometimes viewed as a concrete phytocoenosis. Associations with floristic and territorial affinities can be grouped in larger ecological conceptual units called "alliances". Similar alliances may be grouped in "orders" and orders in vegetation "classes". The setting of syntaxa in such a hierarchy makes up the syntaxonomical system, or the reference model of the given vegetation and territory.
This science began with Charles Flahault and continued in earnest with the work of Josias Braun-Blanquet.

Vegetation complexes

Nowadays, phytosociologists try to include higher levels of complexity in the perception of vegetation, namely by describing whole successional units or, in general, vegetation complexes. These lie in the scope of Landscape Phytosociology. Other developments include the use of multivariate statistics for the definition of "syntaxa" and their environmental interpretation.
On the one hand, some authors consider phytosociology to be in the scope of contemporary vegetation science, a successful approach because of its highly descriptive and predictive powers, and its usefulness in nature management issues. On the other hand, there are numerous critics who have focused on several methodological limitations: the absence of statistical approaches, the complexity and non-stability of the nomenclatural system, the mistakes in the predictive models, and certain basic assumptions.

Habitat-type classification

Even if in continental Europe, a complete synsystem describing vegetation types has been developed and it is a basis for habitat-type classification, there are numerous scientific experts who do not have a positive opinion about the suitability for phytosociology to be the main geobotanical approach for managing vegetation systems. An important point of disagreement is the floristic-phytosociological assumption that the forest patches of the Mediterranean species of pines mainly derived from afforestations, non-stables and incidentals.

Data collections

Phytosociological data contain information collected in relevés listing each species cover-abundance values and the measured environmental variables. This data is conveniently databanked in a program like TURBOVEG allowing for editing, storage and export to other applications.
Data is usually classified and sorted using TWINSPAN in host programs like JUICE to create realistic species-relevé associations. Further patterns are investigated using clustering and resemblance methods, and ordination techniques available in software packages like CANOCO or the R-package vegan.