مدل نمونه‌برداری بینومیال برای تخمین جمعیت شته‌ی یولاف-گندم avenae (F.) (Hem.: Aphididae) Sitobion در مزارع گندم آبی شهرستان میانه
محورهای موضوعی : حشره شناسی گیاهان زراعی
کلید واژه: توزیع فضایی, نمونه‌برداری بینومیال, شته, avenae Sitobion, پایش جمعیت,
چکیده مقاله :
این تحقیق به منظور تعیین نوع توزیع فضایی و ارائه ی مدل نمونه برداری بینومیال برای تخمین تراکم جمعیت شته ی avenae Sitobion در مزارع گندم آبی منطقه ی میانه در سطوح دقت 10% و 25% انجام شد. برای نمونه برداری از جمعیت این شته در طول فصل زراعی 1391، هر سه روز یک بار تعداد 100 ساقه ی گندم مورد بازدید قرار گرفت و تعداد شته ها شمارش شد. میانگین و واریانس جمعیت در هر تاریخ نمونه برداری برای تخمین پارامتر های توزیع فضایی مورد استفاده قرار گرفت. در ادامه با توجه به مناسب تر بودن قانون نمایی تایلور، پارامتر های این روش برای تهیه ی مدل نمونه برداری بینومیال در دو سطح دقت 10 و 25 درصد استفاده شد. نتایج نشان داد که توزیع فضایی شته ی یولاف - گندم در مزرعه به صورت تجمعی بود. با توجه به نتایج به دست آمده، مدل نمونه برداری بینومیال اندازه ی نمونه ی لازم برای تخمین جمعیت شته ی یولاف - گندم را نسبت به مدل شمارشی کاهش داد. بنابراین، مدل نمونه برداری بینومیال ارائه شده در سطح دقت 25 درصد برای تخمین جمعیت شته ی یولاف - گندم در مزارع گندم آبی منطقه ی میانه مناسب و قابل توصیه می باشد.
In order to estimate Sitobion avenae population density in Miyaneh region, northwest of Iran, spatial distribution of the aphid was studied and binomial sampling plans were developed at precision levels of 10 and 25%. Sampling was carried out every three days by examining 100 wheat stems and counting the aphids. The mean and variance of aphid population in each sampling were used to estimate spatial distribution parameters. According to the Taylor's power law and regarding to better description of the obtained data, the technique was used to develop binomial sampling plans at 10 and 25% precision levels. Based on the results, S. avenae showed clumped spatial distribution. Binomial sampling plan was better than enumerative one, because of reduction in sample size required for sampling aphid populations. In conclusion, the binomial sampling plans at 25% precision level was recommended for monitoring S. avenae population in irrigated wheat fields in Miyaneh region.
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