N2000-Alien plants along river banks
Protected areas and the Natura 2000 network are keystones of the EU nature and biodiversity policy. However, alien plants do not stop their spread at the border of protected areas and invasive plants are reported to threaten many ecosystems, notably in aquatic and riparian areas.
A stratified sampling of the Natura 2000 network in Wallonia revealed that at least 41 alien plant species were present. 75 % of the sampled sites were invaded by at least one alien plant species.
此資料的發布者及權利單位為 University of Liège。 This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.
Occurrence; Alien plants; alien flora; exotic plants; Natura 2000; river banks; Observation
Wallonia, southern Belgium.
|界定座標範圍||緯度南界 經度西界 [49.526, 3.645], 緯度北界 經度東界 [50.763, 6.341]|
|起始日期 / 結束日期||2013-05-02 / 2013-09-08|
|計畫名稱||Etat des lieux de l’occurrence d’espèces végétales exotiques dans les habitats rivulaires d’intérêt biologique et patrimonial.|
|經費來源||Project funded by Service Public de Wallonie DGARNE-DNF.|
|研究區域描述||River banks included in the N2000 network of the Walloon Region (Southern Belgium).|
A stratified sampling was performed across the N2000 network in the Walloon Region, using bioclimatic subregions (Ardenne, Lorraine, Famenne, Condroz and Hesbaye) and water basin size (> or < 100 km²) as strata. A sampling unit consisted in a 150 long x 10m wide strip of river bank. In a total of 187 sampling units (corresponding to ca. 0.4% of the 6800 km of rivers in the Wallon Natura 2000 network), vegetation surveys were realized between May and September 2013.
|研究範圍||The study took place along river banks included in the N2000 network of the Walloon Region (Southern Belgium), between May and September 2013.|
- A map of the N2000 network was crossed with the hydrographic network map of Wallonia.
- Using this map, 10 strata were defined based on bioclimatic subregions (Ardenne, Lorraine, Famenne, Condroz and Hesbaye) and water basin size (> or < 100 km²) and the number of potential sampling units in each stratum was calculated.
- A constant proportion of sampling units were randomly selected in each stratum.
- Each sampling unit was visited and vegetation relevés were realized.