تأثیر جنگل‌کاری‏ های کاج تهران و سرو نقره ‏ای بر باران ‏ربایی در اقلیم نیمه‏ خشک

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه جنگل‏داری و اقتصاد جنگل، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران

2 دانشیار گروه جنگل‏داری و اقتصاد جنگل، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران

چکیده

این پژوهش با هدف مقایسة باران‏ربایی (I) توده‏های دست‏کاشت کاج تهران (Pinuseldarica Medw.) و سرو نقره‏ای (Cupressus arizonica Green.) در پارک جنگلی چیتگر تهران با اقلیم نیمه‏خشک انجام شد. میزان بارندگی (GR) با استفاده از 10 باران‏سنج دستی در نزدیک‏ترین فضای باز به توده‏ها اندازه‏گیری شد. برای اندازه‏گیری میزان تاج‏بارش (TF)، تعداد 50 باران‏سنج به‏طور تصادفی در هر توده نصب شد و اندازه‏گیری‏ها از شهریور 1391 تا شهریور 1392 انجام شد. از 55 رخداد GR اندازه‏گیری‌شده با مجموع عمق 5/262 میلی‏متر، مقدار I تجمعی کاج تهران و سرو نقره‏ای به ترتیب 0/80 میلی‏متر (5/30‌ درصد) و 3/60 میلی‏متر (0/23‌ درصد) و همچنین درصد باران‏ربایی (I:GR) به ترتیب 8/46 و 8/37 درصد به‌دست آمد. همبستگی‏های مثبت معنا‏داری بین I و GR در سطح 95‌ درصد برای کاج تهران (663/0 r = ؛811/0 + GR135/0I = ) و سرو نقره‏ای (757/0 r = ؛620/0 + GR100/0I = ) مشاهده شد. نتایج نشان داد درصد I:GR دو گونه فقط در کلاسة GRهایی با مقدار کم (0/5-1/0 میلی‏متر) اختلاف معنا‏داری با‌هم دارند (01/0P < ). نتایج این پژوهش نشان می‏دهد که گونة سرو نقره‏ای مناسب‏تر از کاج تهران برای جنگل‌کاری در این اقلیم است، زیرا مقدار آب رسیده به کف جنگل در توده‏های سرو نقره‏ای بیشتر است.

کلیدواژه‌ها


عنوان مقاله [English]

Afforestations Impact of Pinus eldarica and Cupressus arizonica on Rainfall Interception in a Semiarid Climate Zone

نویسندگان [English]

  • Seyed Mohammad Moein Sadeghi 1
  • Pedram Attarod 2
1 M.Sc. Student of Forestry and Forest Economic, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran
2 Associate Professor, Forestry and Forest Economic Department, Faculty of Natural Resources, University of Tehran, Karaj, I.R. Iran
چکیده [English]

The main goal of this study was to compare of rainfall interception (I) by Pinus eldarica and Cupressus arizonica plantations afforested in the Chitgar Forest Park in a semiarid climate zone of Iran. From the September 2012 to September 2013, gross rainfall (GR) and throughfall (TF) were collected through 10 and 50 rain-gauges, respectively. I was calculated as the difference between GR and TF. During the measurement period, fifty five rainfall events with the cumulative value of 262.5 mm were recorded. Over the study period, I was calculated 80.0 mm (30.5 %), and 60.3 mm (23.0 %) for P. eldarica and C. arizonica, respectively. The percents of the interception (I:GR)% were estimated 46.8% and 37.8%, respectively. Significant positive correlations were observed between I and GR by P. eldarica (I = 0.135GR + 0.811; r = 0.663), and C. arizonica (I = 0.100GR + 0.620; r = 0.757) afforestations (P < 0.05). T-test suggested that there were significant differences between the (I:GR)% values at the small and very small storms classes (0.1-5.0 mm) between P. eldarica and C. arizonica (P < 0.01). The greater interception loss by P. eldarica proposed that in this climate zone, it is preferable to plant C. arizonic relative to P. eldarica trees.

کلیدواژه‌ها [English]

  • Afforested stand
  • Chitgar forest park
  • Manual rain-gauge
  • Rainfall amount
 

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