اثر رویش گیاهی و عملکرد جست‌گروه‌های حاصل از کف‌بر کردن سه گونه اکالیپتوس (بررسی موردی: تصفیه‌خانه فاضلاب شهر یزد)

نوع مقاله: علمی - پژوهشی

نویسندگان

1 استادیار پژوهشی بخش تحقیقات منابع طبیعی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان یزد، سازمان تحقیقات، آموزش و ترویج کشاورزی، یزد، ایران.

2 کارشناس پژوهش بخش تحقیقات منابع طبیعی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان یزد، سازمان تحقیقات، آموزش و ترویج کشاورزی، یزد، ایران.

چکیده

تأثیر کف­بر کردن بر رویش گیاهی و عملکرد جست­گروه­های سه گونه از اکالیپتوس (Eucalyptus camaldulensis،E. microthecaو E. sargentii) هفت­ساله که در اثر یخبندان آسیب‌دیده بودند، ارزیابی شد. درختان مورد آزمایش در مجاورت تصفیه­خانه فاضلاب شهری یزد، پرورش‌یافته و به­وسیله فاضلاب آبیاری شدند. گونه­های مورد بررسی در قالب طرح بلوک­های کامل تصادفی و در سه تکرار با 36 پایه در هر بلوک در سال 1386 کاشته شده و در زمستان 1392 آسیب دیدند. در بهار 1393 کلیه پایه­ها در ارتفاع 15 سانتی­متری از سطح خاک کف­بر شدند. پس از سه ماه، تعداد جست به سه عدد در هر پایه کاهش یافت. پس از گذشت سه سال، نتایج کف­بر کردن، روی تعداد شش پایه در هر بلوک با انتخاب تصادفی ارزیابی شد. قطر، ارتفاع، سطح، حجم و درصد ­پوشش تاجی و همچنین قطر برابر­سینه جست­گروه­ها در گونه­های مختلف دارای اختلاف معنی­داری بود. توانایی بیشتر E. microtheca در تولید جست­گروه و برتری E. camaldulensis در شاخص­های مربوط به رشد جست­گروه­های تشکیل­شده، اختلاف معنی­داری را نشان داد. در برخی از شاخص­های رشد مثل قطر متوسط تاج و سطح ­پوشش تاجی اختلاف معنی­داری بین E. camaldulensis و E. sargentii مشاهده نشد.

کلیدواژه‌ها


عنوان مقاله [English]

Effects of coppicing on vegetative growth and yield of coppice in three eucalyptus species, damaged by frost (Case study: Wastewater treatment station of Yazd city)

نویسندگان [English]

  • Mohammad Hadi Rad 1
  • Mahdi Soltanii Gerdeframarzi 2
1 Assistant Prof, Research Division of Natural Resources, Yazd Agricultural and Natural Resource Research and Education Center, Agricultural Research Education and Extension Organization (AREEO), Yazd, I. R. Iran.
2 M.Sc., Research Division of Natural Resources, Yazd Agricultural and Natural Resource Research and Education Center, Agricuture Research Education and Extension Organization (AREEO), Yazd, I. R. Iran.
چکیده [English]

Reaction vegetative growth and yield of 7-year-old trees of three eucalyptus species (Eucalyptus camaldulensis, E. microtheca and E. sargentii) to coppicing and coppice production which damaged by frost, were studied. Trees had been planted under Yazd climate conditions and they have been irrigating with wastewater. The species were used in this experiment; planted in 2007 for compatibility testing in a randomized complete block design with three replications and 36 plants per each block. All trees were damaged by frost in 2013. In the spring, trees were cut by a chainsaw at a height of 15 cm from the soil surface. After three months of coppice growth, the number of coppices were reduced to three in each trunk. After three years, results of coppicing and thinning of coppices were evaluated on six plants in each block that they were selected randomly. For evaluating production ability of coppice on each trunk, all plants in each block were investigated. The results showed that between the coppices of species were significant difference (P <001) in the number of basis after coppicing. E. microtheca had the most of basis with 80.26 percentages. Diameter equations and height of coppices in all of species had significant difference (P<001). Coppices canopy diameter, surface canopy, volume and percentage canopy had significant difference (P<05). E. camaldulensis coppices had better characteristics than other species. In some cases, such as coppices canopy diameter and canopy surface were not significant difference between E. camaldulensis and E. sargentii.

کلیدواژه‌ها [English]

  • Growth characteristic
  • E. camaldulensis
  • E. microtheca
  • E. sargentii
  • Wastewater
  • Yazd
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