Journal
FORESTS
Volume 6, Issue 10, Pages 3501-3513Publisher
MDPI
DOI: 10.3390/f6103501
Keywords
alder-dominated forests; diversity; native and alien species; soil nutrients; vascular plants; vegetation
Categories
Funding
- Science Grant Agency of the Ministry of Education of the Slovak Republic
- Slovak Academy of Sciences [VEGA 2/0019/14, 2/0051/15]
- COST project European Information System for Alien Species
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Soil nitrogen and phosphorus are commonly limiting elements affecting plant species richness in temperate zones. Our species richness-ecological study was performed in alder-dominated forests representing temperate floodplains (streamside alder forests of Alnion incanae alliance) and swamp forests (alder carrs of Alnion glutinosae alliance) in the Western Carpathians. Species richness (i.e., the number of vascular plants in a vegetation plot) was analyzed separately for native and alien vascular plants in 240 vegetation plots across the study area covering Slovakia, northern Hungary and southern Poland. The relationship between the species richness of each plant group and total soil nitrogen content, plant-available phosphorus and carbon to nitrogen (C/N) ratio was analyzed by generalized linear mixed models (GLMM) with Poisson error distribution and log-link function. The number of recorded native and alien species was 17-84 (average 45.4) and 0-9 (average 1.5) species per plot, respectively. The GLMMs were statistically significant (p < 0.001) for both plant groups, but the total explained variation was higher for native (14%) than alien plants (9%). The richness of native species was negatively affected by the total soil nitrogen content and plant-available phosphorus, whereas the C/N ratio showed a positive impact. The alien richness was predicted only by the total soil nitrogen content showing a negative effect.
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