نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه جغرافیای طبیعی دانشگاه تبریز
2 جغرافیای طبیعی (اقلیم شناسی)، دانشگاه محقق اردبیلی
3 جغرافیای طبیعی (اقلیم شناسی) دانشگاه تبریز
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
The recognition of climate and eco-physiology of agricultural plants can be regarded as one of the most imperative factor in the production of agricultural yield development, and promotion of agricultural activities in any region. This recognition may enhance the production level in one hand, and the reduction of damage resulting from incongruous climate factors in another. The current research has been carried out aiming at the determination of potentially suitable canola production zone in Kurdestan province. Climatic data from 34 existing climate stations, which had long term records were collected and analyzed. We considered climatic factors such as precipitation required for growth period, frostiness, minimum and maximum, mean annual temperatures. We also used total amount of sunshine hours, average relative humidity of phonologic stage of canola, and physical elements including the type of land uses. This was followed by the determination of different layers for each climatic demand through the application of geographical information system (GIS) function. After appropriate evaluation of canola growth requirements using weighted classification method, the layers were categorized. As a final step, all climatic and physical layers were combined in the GIS environment by overlaying of different indices and results indicated that about 6.8 percent of Kurdestan province is suitable for canola cultivation, including Divan Darreh, Dehgolan, and Marivan plains. The reason for such suitability is better climatic, topographic, and pedologic conditions in that area. About 39.4 percent of the whole area is unsuitable for canola cultivation due to inappropriate climatic conditions, and unsuitable physical environment. These areas include northeast and northern parts (Obatoo district), and parts of the central and north west of the province. The remaining areas were classified as average to appropriate occupying 29.3 and 24.5 percent of area, respectively.
�p ���� ��� انگین حداکثر دما، میانگین سالانه دما، مجموع ساعات آفتابی، میانگین رطوبت نسبی مرحله فنولوژیکی کلزا و از عوامل فیزیکی زمین تیپ و کاربری اراضی در نظر گرفته شد. با استفاده از توابع ویژه سامانه اطلاعات جغرافیایی، برای هریک از نیازهای اقلیمی لایه جداگانهای تهیه گردید. پس از ارزشگذاری متناسب با نیاز رویشی کلزا به کمک مدل طبقهبندی وزنی، لایههای مذکور طبقهبندی شدند و در نهایت، همه لایه های اقلیمی و فیزیکی زمین با روش همپوشانی شاخصها در محیط GIS تلفیق گردیدند. نتایج حاکی از عدم انطباق شرایط اقلیمی و محیطی استان جهت کشت کلزا میباشد. نتیجه نهایی بیانگر آن است که تنهاتحدود 8/6 درصد از مساحت استان از جمله دشت های دیواندره، دهگلان و مریوان برای کشت کلزا بسیار مناسب میباشند که بیشتر به علت شرایط اقلیمی و توپوگرافی و خاک مناسب آنهاست. حدود 4/39 درصد از مساحت استان شامل شمالشرق و شمال (محدوده اباتو) و قسمتهایی از نواحی مرکزی و شمال غرب استان به دلیل شرایط نامساعد اقلیمی و محیطی، نامناسب برای کشت شناخته شد. بقیه مناطق با 8/53 درصد از مساحت استان در درجه متوسط تا مناسب قرار گرفتند. t;&� i-�� ��� ;margin-bottom: 0cm;margin-left:21.25pt;margin-bottom:.0001pt;text-align:justify;text-justify: kashida;text-kashida:0%;text-indent:-21.25pt'>Nash JE, 1957. The form of the instantaneous unit hydrograph. Hydrol Sci Bull 3: 114-121.
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کلیدواژه‌ها [English]
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