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تأثیر کوبیدگی خاک بر سیستم ریشه نونهال‌های توسکای ییلاقی (Alnus subcordata C. A. Mey) | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 3، دوره 25، شماره 3 - شماره پیاپی 69، مهر 1396، صفحه 376-385 اصل مقاله (232.21 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2017.112872 | ||
| نویسندگان | ||
| مقداد جورغلامی* 1؛ آزاده دلجویی2؛ الهه‌السادات حسینی علا3 | ||
| 1دانشیار گروه جنگل‌داری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران | ||
| 2دانشجوی دکتری مهندسی جنگل، گروه جنگل‌داری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران | ||
| 3کارشناسی 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 | ||
| جرم مخصوص؛ خاک؛ زی‌توده؛ نسبت‌های تخصیص | ||
| عنوان مقاله [English] | ||
| Impact of soil compaction on root system of Caucasian aldar (Aluns subcotdata C. A. Mey.) seedlings | ||
| نویسندگان [English] | ||
| Meghdad Jourgholami1؛ Azade Deljouei2؛ Elahe Sadat Hosseini Ala3 | ||
| 1Associate Prof., Department of Forestry and Forest Economics, University of Tehran, Karaj, Iran | ||
| 2Ph.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 | ||
| مراجع | ||
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