امکان سنجی کشت یونجه یکساله (Medicago scutellata) در شهرستان آق قلا (استان گلستان) با استفاده از GIS

نوع مقاله : علمی - پژوهشی

نویسندگان

دانشگاه علوم کشاورزی و منابع طبیعی گرگان

چکیده

در این تحقیق به منظور امکان سنجی اراضی کشاورزی شهرستان آق قلا در استان گلستان جهت کشت یونجه ی یکساله(Medicago scutellata)، از سامانه ی اطلاعات جغرافیایی (GIS) و تصمیم گیری چند معیاره استفاده شد. بدین منظور اطلاعات و لایه های مورد نیاز از منطقه مورد بررسی در سال 1392 جمع آوری و نقشه های موضوعی مورد نیاز تهیه شد. از روش‌های کریجینگ (مدل‌های گوسی، نمایی و کروی) و نیز وزن‌دهی فاصله معکوس برای تهیه لایه‌های متغیرهای محیطی استفاده شد. سپس لایه های رقومی عوامل محیطی در محیط GIS با اختصاص وزن حاصل از فرایند تحلیل سلسله مراتبی ( (AHP روی هم‌گذاری وزنی و تلفیق شدند. در انتها لایه نهایی در 4 پهنه بسیار مستعد، مستعد، نیمه مستعد و غیر مستعد طبقه بندی شد. نتایج نشان داد که به ترتیب 1/23 درصد و 2/47 درصد اراضی کشاورزی این شهرستان برای کشت یونجه یکساله بسیارمستعد و مستعد هستند. در این مناطق مقدار بارش و اکثر متغیرهای حاصلخیزی خاک و توپوگرافی در سطح مطلوبی قرار داشتند. مناطق نیمه مستعد و غیر مستعد (حدود 30 درصد اراضی) نیز بیشتر در شمال غربی، شرق و جنوب اراضی زراعی شهرستان قرار گرفتند. از دلایل وجود این پهنه‌ها، عدم تطبیق نیازهای محیطی مورد نیاز گیاه یونجه یک‌ساله با خصوصیات بوم‌شناختی این اراضی می‌باشد.در این مطالعه میزان بارش اندک، EC بالا در حدود 30 دسی زیمنس بر متر، محتوی پایین ماده آلی، کلسیم و پتاسیم از عوامل محدود کننده کشت شناخته شد..در این مطالعه میزان بارش اندک، EC بالا در حدود 30 دسی زیمنس بر متر، محتوی پایین ماده آلی، کلسیم و پتاسیم از عوامل محدود کننده کشت شناخته شد.

کلیدواژه‌ها


عنوان مقاله [English]

Feasibility of annual alfalfa (Medicago scutellata) cropping in Aq-Qalla township (Golestan province) using GIS

نویسندگان [English]

  • niloofar Nasrollahi
  • hossein kazemi
  • Behnam Kamkar
GUASNR
چکیده [English]

In this study, geographical information system (GIS) and multi-criteria evaluation (MCE) were applied to feasibility of agricultural lands in Aq-Qalla township for annual alfalfa (Medicago scutellata) cultivation. For this purpose, required data and information of the study area collected during 2013, and thematic maps were provided. Kriging and IDW methods were applied to interpolation of environmental variables. The digital environmental layers overlaid and integrated in GIS media in respect to AHP weights and then zoning of lands carried out in four classes (high suitable, suitable, semi suitable and non-suitable). The results showed that 23.1% and 47/2% of this area were high suitable and suitable for alfalfa cropping, respectively. These zones had enough rainfall, suitable topography and high fertility. The semi- suitable and non- suitable regions (about 30% of area) were located in the northwest, east and south of Aq-Qalla township. In these zones, the environmental requires of annual alfalfa had not fitted to ecological variables of agricultural land. In this study, the limitation factors were including: high EC (about 30 dS/m), deficient of organic matter, K and Ca
In these zones, the environmental requires of annual alfalfa had not fitted to ecological variables of agricultural land. In this study, the limitation factors were including: high EC (about 30 dS/m), deficient of organic matter, K and Ca.

کلیدواژه‌ها [English]

  • Land suitability
  • Medicago scutellata
  • Geographical information system
  • Kriging
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