نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری علوم مرتع، گروه احیاء مناطق خشک و کوهستانی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران.
2 استاد گروه احیاء مناطق خشک و کوهستانی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران، کرج، ایران.
3 استادیار مرکز تحقیقات بین‌المللی بیابان، دانشگاه تهران، کرج، ایران.
چکیده
استقرار پوشش گیاهی بهترین راه کنترل اراضی تخریب شده و در معرض خطر تخریب میباشد. با توجه به این که نهالکاری در مناطق خشک به دلیل محدویتهای اکولوژیکی بسیار پرهزینه میباشد کارشناسان به دنبال روشهایی هستند که درصد استقرار نهالها را افزایش داده و هزینههای نهال کاری را کاهش دهند. در این راستا استفاده صحیح از اصلاح کنندهها بسیار اهمیت دارد. منطقۀ مورد مطالعه در شهرستان نظرآباد در جنوب غربی استان البرز واقع شده است. در این تحقیق از اصلاح کنندههای بیوچار معدنی، قارچ های میکوریزی آربسکولار و پلیمر رزین اکریلیک هر کدام در چهار سطح در پای نهالهای قرهداغ استفاده شد. ویژگیهای خاک منطقه هنگام کشت اندازهگیری شد. بعد از گذشت یک سال با شمارش تعداد نهالهای زنده مانده، درصد استقرار برای هر تیمار محاسبه گردید. برآورد اقتصادی براساس هزینه-فایده محاسبه گردیده و برای هر تیمار به طور جداگانه محاسبه شد. نتایج نشان داد که تفاوت معنیداری در سطح 5 % بین اصلاح کنندهها و شاهد از نظر استقرار وجود دارد و میکوریز دارای بیشترین (70 %) و تیمارهای شاهد دارای کمترین (40 %) درصد استقرار بودند. از نظر اقتصادی تیمارهای میکوریز 100گرم، پلیمر 50گرم و بیوچار 250گرم به ترتیب بهینهترین تیمارهای هر اصلاح کننده بودند. با افزایش سطح استفاده از میکوریز درصد استقرار نهالها افزایش یافت ولی با افزایش سطح استفاده از پلیمر و بیوچار اثرات منفی آنها نمایان شد و درصد استقرار نهالها کاهش یافت. هر تیماری که استقرار نهالها را حداقل 10 درصد افزایش داد توجیه اقتصادی داشت یعنی فایدههای آن تیمار بیشتر از هزینههای آن برآورد شد.
کلیدواژه‌ها
عنوان مقاله [English]
Investigation the Effect of Amendments on the Biological Reclamation of Salt-Lands from an Economic Perspective in Nazarabad, Alborz Province
نویسندگان [English]
- Shahram Yousefi Khanghah 1
- Hossein Azarnivand 2
- Mohammad Ali Zare Chahouki 2
- Mohammad Jafari 2
- Hamidreza Naseri 3
1 PhD. Student, Range science, Department of Reclamation of Arid and Mountainous Regions, Faculty of Natural Resources, University of Tehran
2 University of Tehran
3 Department of Desert Management, International Desert Research Center , University of Tehran, Iran
چکیده [English]
The establishment of vegetation is the best way to manage degraded and at risk of degradation lands. Considering that the planting in arid lands is very costly because of ecological restrictions, so experts are looking for methods that increase the percentage of the seedlings establishment and reduce the cost of planting, in this regard the correct use of amendments is very important. The study area is located in Nazarabad City in southwest of Alborz province. In this study, the amendments including mineral biochar, arbuscular mycorrhiza fungi and acrylic resin polymer each in four levels were used at the base of Nitraria schoberi seedlings. The soil characteristics of the area was determined at the start of planting. After one year with counting the number of live seedlings, the percentage of establishment for each treatment was calculated. Economical estimates were calculated based on cost-benefit and calculated separately for each treatment. The results showed that there was a significant difference at the 5% level between the amendments and the control. Mycorrhizae had the highest (70%) and the control and biochar 4 treatments had the least (40%) percent of establishment. Economically, mycorrhizal 2, polymer 2 and biochar 1 treatments were the most optimal treatments for each amendment, respectively. The used amendments had different effects on the establishment of seedlings, so that the percentage of establishment increased with increasing level of mycorrhiza use, but with increasing level of polymer and biochar use, negative effects were observed and the percentage of seedling establishment decreased.
کلیدواژه‌ها [English]
- salinity
- amendment
- cost
- economy
- arid-land
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