Variability of phenological stages of Dactylis glomerata in dependence on meteorological conditions in the Czech Republic
Abstrakt
Periodicity in the life of plants and animals is considered to be an indirect indicator for the periodicity in the climate. Many studies examining the impacts of global warming on terrestrial ecosystems reveal a consistent pattern of change, the response to warming by phenological change across the northern hemisphere seems to be especially well documented .The CHMI phenological network comprises 24 species of wood plants and 21 species of herbs observed at forest phenological stations including cocks foot (Dactylis glomerata).In this paper we have examined inflorescence emergence (BBCH 51), beginning of flowering 10% (BBCH 61) and end of flowering (BBCH 69) of cocks foot from selected stations at different elevation.
Data were executed in MS Excel and by using of GIS method (Clidata-DEM) from 45 phenological stations in the period 1991–2010.Meteorological conditions (temperature and precipitation) at Lednice (165 masl) and Pernink (860 masl) stations were compiled together with data of flowering during 1991–2010 into phenotermopluviogram.The variability of cocks foot phenological stages was very changeable in the years 1991–2010, the tendency to earlier onset was observed. Vertical phenological gradient of inflorescence emergence and end of flowering is 4 days/100 m, of beginning of flowering is 3 days/100 m.
The sum of air temperature between inflorescence emergence and beginning of flowering 10% varies from 138 to 198°C and in the time of flowering from 295 to 348°C at different elevation. Duration of sunshine lasts from 90 to 98 hours (BBCH51–BBCH61) and from 149 to 158 hours (BBCH61–BBCH69).