The importance of Poa trivialis L. for self-grassing
1997
Novak, J. (Slovak Univ. of Agriculture, Nitra (Slovak Republic))
The results of floristic evaluation of the permanent research fields situated at an altitude of 600 m in the Strazovske vrchy mountains (Slovak Republic) show that Poa trivialis considerably affects density and formation of plant cover. It is a species preserved from the phytocoenosis of the ruderal plant cover by the formation of above-ground rooting stolons after reseeding of valuable cultivated species in the eutrophisated stand. As such it filled up the clear spaces formed in the turf density after the reseeding of competively weaker species, even on the variant without additional sowing. On the variant A1 the share of original species Poa trivialis increased in four years to 72.75 %, on the variant K in three years up to 78.28 %. However, in the following years its share decreased as a consequence of the higher biodiversity. On the variant A3 reseeding of competively strong species (Dactylis glomerata) its share sharply decreased, and its occurrence was only sporadic, in the form of thin tufts. As a consequence of decreased level of soil nutrients, the dominance of Poa trivialis was lost. Poa trivialis was the most dynamic constituent of the plant stand. After the stand was thinned by mowing, it thickened and embedded the turf, self-grassed the clear spaces and protected the soil from the anemochoric spreading of weed species and erosion
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