Vegetalization test

Phytosociological study

  • Vegetalization test zones unweeded
  • Philippe FERARD

Nature of groupings

  • In general, pavements surface is made of « inerts » materials such as quarry sand, concrete, Tarmac, or cobblestones. Due to underfoot trampling more or less intense and causing a continuous stress, these anthropic environments present a great homogeneity of groupings observed : 10 out of 13 inventories belong to Polygono arenastri Coronopodion squamati (vegetation of sunny areas submitted to underfoot trampling, and urban lawn), while the remaining three are attached to Sisymbrion officinalis (Vegetation of dry areas submitted to occasional underfoot trampling), to Saginion procumbentis (Vegetation of cobblestones chinks and base of urban walls) and to Arrhenatherion elatioris ( degraded shape of vegetation from the mesophile meadows)
  • Quai Ceineray NantesQuai Ceineray Nantes

Evolution trends

  • Analyse of inventories performed has allowed to establish a general set of scenario for possible evolutions, by comparing data collected from the test sites to the evolution assumptions described by Marcel Bournerias (BOURNERIAS et al, 2001).
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  • Driving factors affecting the evolution of test zones free from chemical weedkiller are:
  • - Intensity of underfoot trampling
  • - Duration of period since the cessation of weeding
  • - Practice of mowing
  • - Nearness of natural environments and gardens
  • - Nature of substratum (sand/cobblestones in particular)