Morphological comparison of Ambrosia psilostachya in different habitats of Bandar-Anzali (Guilan province, north of Iran)

This study was done to compare the plant morphology of Ambrosia psilostachya DC. (ragweed) in four habitats of roadsides (۱), paddy field margins (۲), around residential areas (۳) and coastal areas (۴) in Bandar-e Anzali (Guilan province, north of Iran) in ۲۰۱۹. Sampling was random in five growth stages with ۱۰ plants in each habitat. The results indicated that, the highest biomass, plant height and inflorescence length was in the habitats of (۲) & (۴), and the highest inflorescence numbers was in (۳) & (۲). The maximum plant biomass in the habitats of (۲), (۱) & (۴) was ۱۱۰ days, and in (۳) was ۸۲ days after the emergence and then the plant entered the reproductive phase. The trend of plant height increased in the habitat of (۱) continued up to ۶۹ days, and in (۲) & (۴) continued up to ۱۱۰ days after emergence and then decreased while in habitat of (۳), the trend was linear and continued until November. The beginning of flowering was in mid-July in all habitats. The increasing trend of number of flowering stems in habitats of (۳) & (۴) was up to ۸۲ days after emergence, but in (۲) & (۱) had a linear trend and continued until November.  

کلیدواژه ها:

Asteraceae ، biomass ، Invasion ، Non-native plant ، phenology ، Ragweed