Weed community structure, species diversity and weed mapping in irrigated wheat fields of Kermanshah Province

In order to identify and determine the distribution of weeds in irrigated wheat fields of Kermanshah province, 142 fields in 11 counties were investgated during 2000 to 2008. After weed survey the charsterictics of weed species were evaluated. Then density, frequency, uniformity, mean density, abundance index, Shannon- Wiener diversity index, Simpson index were determined. In irrigated wheat fields of Kermakshah province 91 weed species were identified that 15 species belonged to grass weed and 76 species were belonged to broadleaf weed. Asteraceae, Fabaceae, Poaceae and Brassicaceae were the most important families with 59. 7, 26. 5, 23 and 18. 4 percent of FIV, respectively, were most important plant families. Based on the result of this study Galium tricornatum، Centaurea depressa and Sinapis arvensis were the dominant broadleaved weeds. Hordeum spontaneum and Avena ludoviciana were the important grass weeds. In addition, the most important troubleome preharvest weeds were Glycyrrhiza glabra, Sophora alopecuroides and Convolvulus arvensis in irrigated wheat fields. Shannon- Wiener diversity index showed the highest species diversity were in Kermanshah with 3. 27 and the lowest species diversity in Javanrood and Sarpolezohab were respectively 1. 15 and 2. 28.