SRCE: Dry Calcicol Dry Lawns of the SRCE Poitou-Charentes

Calcicol dry lawns classified as reservoirs of biodiversity by the SRCE Poitou-Charentes. __Origin__ 1 — The identification of the constituent media of this sub-trame was carried out directly by gathering the available knowledge elements (inventories of naturalist associations) by completing with a photointerpretation study on the entire Poitou-Charentes region....); this work was carried out by BER with the support of CBNSA. For this subframe, we aim to group dry lawns into sets of sufficient size to correspond to the definition of the biodiversity reservoirs of the SRCE (representation at 1/100000). It will be considered that within the same reservoir, dry lawns can function practically as a single entity because of their low remoteness that can allow the movement of most species on a small scale of time (daily needs). This grouping is carried out by a cartographic treatment of expansion/erosion. The treatment is established over a distance of 400 meters, chosen from the bibliography available on the Azure of Serpolet (Maculinea arion) whose displacement distance between favorable micro-habitat areas is less than or equal to this threshold. 2 — Potential biodiversity reservoirs have been prioritised in order to select the most spaces functional, corresponding to the biodiversity reservoirs of the territory. The criteria used, presented in the preceding paragraphs, are as follows: area of lawn polygons (S), belonging to a continuity of ' national importance (CIN), overlap with mandatory or non-compulsory biodiversity reservoirs (Z1 and Z2), presence of ' indicator species (E), lawns density (D), expert evidence (ADE). 3 — Pre-identified biodiversity reservoirs were reviewed and modified in the Working Groups Dry calcicold lawns in January and April 2014. The adjustment focused on the groups of lawns and the definition of the contours of the lawns. __Partner organisations__ DREAL Poitou-Charentes, MTDA Agency __Links annexes__ * [basketDownloadFrontalParametrage](https://catalogue.sigena.fr/geosource/panierDownloadFrontalParametrage?LAYERIDTS=840474) [See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/bad4c271e0c90335d3a0e2c0b7b7c87c0a9c6b7e)