Relaties tussen de hoeveelheid stikstofdepositie en de kwaliteit van habitattypen

Abstract

Begrippen en definitiesEmpirische KDW Kritische Depositie Waarde die is opgesteld op basis van veldwaarnemingen, zoals stikstofadditieexperimenten. EUNISEuropean Nature Information System. Een vegetatieclassificatiesysteem op Europese schaal. Gemodelleerde KDWKritische Depositie Waarde die is afgeleid met behulp van een rekenmodel dat kwantitatieve beschrijvingen bevat van processen in bodem en vegetatie die een rol spelen bij het tot stand komen van het effect van stikstof (Van Dobben et al., 2012). HabitattypeNatuurlijk of halfnatuurlijk ecosysteem dat van communautair belang is en daarom op Bijlage 1 van de Habitatrichtlijn staat. Elk habitattype is in een profiel gedefinieerd (Anonymus, 2014) op basis van met name plantengemeenschappen (vegetatietypen). De kwaliteit ervan bestaat, naast die plantengemeenschappen, o.a. uit typische plantensoorten. Habitattypen kunnen uit meerdere subtypen bestaan.

Nitrogen Critical Loads: Critical Reflections on Past Experiments, Ecological Endpoints, and Uncertainties

“…Other figures repeat this "gradient studies" exercise for things like moss species and lichens in heather-dominated moors (Figure 5; p. 20) 20 and total vegetation and lichen in calcareous grasslands in the UK (Figure 7; p. 22). 20 In some of these plots, species diversity does not appear to be related to N because the standard deviation intervals overlap for most level of N deposition. In others it might, as in Figure 3.…”

“…Other figures repeat this “gradient studies” exercise for things like moss species and lichens in heather-dominated moors (Figure 5; p. 20) 20 and total vegetation and lichen in calcareous grasslands in the UK (Figure 7; p. 22). 20…”

“…A so-called dose-response curve from. 20 The x -axis is in kg N ha −1 year −1 . The y -axis is species richness, the model is in black, and the observations are in blue.…”

Nutrient fertilization by dogs in peri‐urban ecosystems

“…Higher nutrient levels lead to increased plant growth, mostly by a limited number of nutrient‐demanding species that will outcompete specialists, particularly by taking away the available light (Hautier et al., 2009), causing plant species loss (De Schrijver et al., 2011) and homogenization of plant communities (Staude et al., 2020). This well‐known effect of N pollution on vulnerable ecosystems has led to the concept of critical deposition loads , which is defined as the limit (‘effect threshold’) above which habitat quality risks to be significantly damaged by the impact of N deposition (Bobbink et al., 2010; Wamelink et al., 2021). For the vegetation types of our study sites 1–3, this critical deposition load is 20 kg N ha −1 year −1 , whereas it ranges for study site 4 between 20 and 34 kg N ha −1 year −1 depending on the vegetation type (Van Dobben et al., 2012).…”

“…This well-known effect of N pollution on vulnerable ecosystems has led to the concept of critical deposition loads, which is defined as the limit ('effect threshold') above which habitat quality risks to be significantly damaged by the impact of N deposition (Bobbink et al, 2010;Wamelink et al, 2021). For the vegetation types of our study sites 1-3, this critical deposition load is 20 kg N ha −1 year −1 , whereas it ranges for study site 4 between 20 and 34 kg N ha −1 year −1 depending on the vegetation type (Van Dobben et al, 2012).…”