تأثیر کوبیدگی خاک بر سیستم ریشه نونهال‌های توسکای ییلاقی (Alnus subcordata C. A. Mey)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 دانشیار گروه جنگل‌داری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

2 دانشجوی دکتری مهندسی جنگل، گروه جنگل‌داری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

3 کارشناسی ارشد مهندسی جنگل، گروه جنگل‌داری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

چکیده

کوبیدگی خاک یکی از عامل‌های ایجاد تنش است که تأثیر منفی بر رشد گیاه دارد. هدف از این پژوهش، بررسی تأثیر کوبیدگی خاک بر سیستم ریشه نونهال­‌های توسکای ییلاقی (Alnus subcordata C. A. Mey.) در شرایط کنترل شده بود. بذرهای توسکای ییلاقی پس از کاشت در گلدآن‌های پلاستیکی، در خاک لومی تا لوم- رسی و رژیم رطوبتی ثابت و در شش سطح کوبیدگی خاک مورد بررسی قرار گرفتند و فاکتورهای قطر یقه، طول، زی­‌توده و نسبت­‌های تخصیص سیستم ریشه نونهال­‌ها اندازه‌­گیری و محاسبه شدند. بر اساس نتایج، فاکتورهای بررسی شده با افزایش جرم مخصوص خاک به‌طور معنی­‌داری کاهش یافتند و به‌جز نسبت طول ریشه جانبی به اصلی به‌صورت تابع درجه دوم کاهش‌یابنده بودند. مقایسه مقادیر در تیمار شاهد نسبت به تیمار با کوبیدگی شدید، 36 درصد کاهش در میانگین طول ریشه جانبی، 31 درصد کاهش در میانگین طول ریشه اصلی، 37 درصد کاهش در میانگین قطر ریشه اصلی، 27 درصد کاهش در میانگین زی­‌توده ریشه و 36 درصد کاهش در میانگین زی­‌توده خشک ریشه را نشان داد. درمجموع، نتایج حاکی از تأثیر منفی تنش کوبیدگی بر ویژگی­‌های سیستم ریشه­ای نونهال­‌های توسکای ییلاقی بود.

کلیدواژه‌ها


عنوان مقاله [English]

Impact of soil compaction on root system of Caucasian aldar (Aluns subcotdata C. A. Mey.) seedlings

نویسندگان [English]

  • Meghdad Jourgholami 1
  • Azade Deljouei 2
  • Elahe Sadat Hosseini Ala 3
1 Associate Prof., Department of Forestry and Forest Economics, University of Tehran, Karaj, Iran
2 Ph.D. Student Forest Engineering, Department of Forestry and Forest Economics, University of Tehran, Karaj, Iran
3 .Sc. Forest Engineering, Department of Forestry and Forest Economics, University of Tehran, Karaj, Iran
چکیده [English]

Soil compaction, as one of the causes of stress, has a negative impact on plant growth. The aim of this study was to evaluate the effect of soil compaction on root system of Caucasian alder (Aluns subcotdata C. A. Mey.) seedlings in controlled condition. After sowing of alder seeds in plastic pots in loamy or clay-loamy soils with constant moisture regimes, the reaction of seeds were evaluated under six levels of soil compaction. Collar diameter, length, biomass, and allocation ratio of root system were measured and calculated. According to the results, the studied parameters decreased significantly by increasing soil bulk density and their trend were downward quadratic, except ratio of lateral root length to main root length. Thirty six percent decrease in the mean of lateral root length, 31% decrease in the mean of main root length, 37% reduction in the mean diameter of main root and 27% fell down in the mean value of root dry biomass was recorded in treatments with different levels of soil compaction in compare to the control treatment. In general, results indicate that compaction tension has negative effect on the characteristics in the root system of Caucasian alder seedlings.

کلیدواژه‌ها [English]

  • Allocation ratios
  • biomass
  • Bulk density
  • soil

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