Török K, Lohász C: The effect of climate ... (2004)

Török Katalin, Lohász C
2004
The effect of climate on the restoration success of sandy grassland in Hungary.
Proceedings of the 16th Annual Conference of the Society for Ecological Restoration. 24-26 August, 2004. Victoria, Canada. p. 1-8.
Csatolt dokumentum: 
Összefoglaló: 

Abstract
Black locust (Robinia pseudo-acacia) was introduced from north America during the mid-eighteenth century to stabilise mowing sand in the arid lowland region of Hungary. The species became common by now and is still the major component of plantations in the sandy lowland. Black locust forests are species poor and respresent a threat to biodiversity by invading the semi-natural neighbourhood. Restoration trials have been started in 1995 after clear-cutting of black locust plantations. Sprouting was hindered by chemical treatment, weed abundance was decreased by mowing and hay removal. Treated and control plot vegetation became different, however, composition and species abundance relations were still far from the traget, endemic grassland community (Festucetum vaginatae) by 2003. The effect of climate was investigated in relation to life history traits. Drought index (PAI) showed higher correlation with vegetation development than precipitation alone. Increased drought resulted lower cover of vegetation in both control and treatment plots, however, different life history traits responded differently. The abundance of spring annuals and perennial monocots was negatively correlated with drought, that of perennial dicots and summer annuals positively. Only summer annuals showed different sensitivity in control and treatment plots (not significantly), as drought resulted in higher cover in mowed plots. This is not necessarily in response to less precipitation, because reduced competition and increased open space can also contribute to higher cover. Altogether the share of different species groups and their response to drought contributed to different vegetation development in control and treatment plots.
Key words: open sandy grassland, drought index (PAI), black locust forest, clear-cutting

Angol nyelvű összefoglaló: 

Black locust (Robinia pseudo-acacia) was introduced from north America during the mid-eighteenth century to stabilise mowing sand in the arid lowland region of Hungary. The species became common by now and is still the major component of plantations in the sandy lowland. Black locust forests are species poor and respresent a threat to biodiversity by invading the semi-natural neighbourhood. Restoration trials have been started in 1995 after clear-cutting of black locust plantations. Sprouting was hindered by chemical treatment, weed abundance was decreased by mowing and hay removal. Treated and control plot vegetation became different, however, composition and species abundance relations were still far from the traget, endemic grassland community (Festucetum vaginatae) by 2003. The effect of climate was investigated in relation to life history traits. Drought index (PAI) showed higher correlation with vegetation development than precipitation alone. Increased drought resulted lower cover of vegetation in both control and treatment plots, however, different life history traits responded differently. The abundance of spring annuals and perennial monocots was negatively correlated with drought, that of perennial dicots and summer annuals positively. Only summer annuals showed different sensitivity in control and treatment plots (not significantly), as drought resulted in higher cover in mowed plots. This is not necessarily in response to less precipitation, because reduced competition and increased open space can also contribute to higher cover. Altogether the share of different species groups and their response to drought contributed to different vegetation development in control and treatment plots.
Key words: open sandy grassland, drought index (PAI), black locust forest, clear-cutting