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ارزیابی بازیابی بلندمدت وزن مخصوص ظاهری، تخلخل و مقاومت به نفوذ خاک 20 سال پس از عملیات چوبکشی در جنگل خیرود | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 14، دوره 23، شماره 3، مهر 1394، صفحه 536-548 اصل مقاله (330.9 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2015.105658 | ||
| نویسندگان | ||
| هادی سهرابی1؛ مقداد جورغلامی* 2؛ باریس مجنونیان3؛ قوام الدین زاهدی امیری3؛ ستار عزتی4 | ||
| 1دانشجوی کارشناسی ارشد مهندسی جنگل، دانشکده منابع طبیعی دانشگاه تهران | ||
| 2دانشیار، گروه جنگلداری و اقتصاد جنگل، دانشکده منابع طبیعی دانشگاه تهران | ||
| 3استاد، گروه جنگلداری و اقتصاد جنگل، دانشکده منابع طبیعی دانشگاه تهران | ||
| 4دانشجوی دکتری جنگلداری، دانشکده منابع طبیعی دانشگاه تربیت مدرس | ||
| چکیده | ||
| تخریب جنگل بهطور همزمان با تخریب خاک شروع میشود. حفاظت و نگهداری خاک باعث حفاظت و نگهداری جنگل میشود، بنابراین مهندسی جنگل باید سعی در توسعه فنونی داشته باشد که میزان تخریب خاک کمتر و زمان بازیابی آن کوتاهتر باشد. پژوهش پیشرو بهمنظور ارزیابی بازیابی وزن مخصوص ظاهری و مقاومت به نفوذ خاکهای کوبیده شده در مسیرهای چوبکشی رها شده بعد از یک دوره 20ساله در جنگل خیرود انجام شد. چهار مسیر چوبکشی انتخاب شد و در هر یک از آنها سه طبقه شدت تردد و دو طبقه شیب مشخص شد تا نمونه گیری در محل رد چرخها در قطعهنمونههای 40 مترمربعی انجام شود. برای نمونه گیری در داخل جنگل، به فاصله 20 تا 30 متر از مسیرهای چوبکشی، قطعهنمونههای شاهد مستقر شدند تا روند بازیابی خاک در مسیرهای چوبکشی با منطقه شاهد با استفاده از آزمون چندگانه دانکن مقایسه شود. نتایج نشان داد که بیشترین مقدار وزن مخصوص ظاهری و مقاومت به نفوذ خاک و کمترین مقدار تخلخل در شدت تردد زیاد و شیب ببیشتر از 20 درصد است. وزن مخصوص ظاهری و تخلخل در محل های مختلف رد چرخ در مسیرهای چوبکشی با گذشت 20 سال، بیشتر و کمتر از منطقه شاهد بود، اما اختلاف آنها معنی دار نبود، درحالی که این اختلاف درمورد مقاومت به نفوذ معنی دار بود. با گذشت 20 سال از عملیات چوبکشی، ویژگیهای فیزیکی خاک در حال بازیابی هستند، بهطوریکه وزن مخصوص ظاهری و مقاومت به نفوذ بهاندازه 12/75 و 23/30 درصد بیشتر و تخلخل به مقدار 9/74 درصد کمتر از منطقه شاهد بود. این اختلاف برای وزن مخصوص ظاهری و تخلخل معنی دار نبود، اما برای مقاومت به نفوذ معنی دار بود. نتایج بهدست آمده نشان داد که برای بازیابی کامل وزن مخصوص ظاهری، تخلخل و مقاومت به نفوذ، مدت زمان بیشتر از 20 سال نیاز است. | ||
| کلیدواژهها | ||
| بازیابی ویژگیهای خاک؛ تخلخل؛ مسیر چوبکشی؛ مقاومت به نفوذ؛ وزن مخصوص ظاهری | ||
| عنوان مقاله [English] | ||
| Soil bulk density, porosity and penetration resistance recovery following timber harvest cessation on abandoned skid trails after 20 years, Kheyroud forest | ||
| نویسندگان [English] | ||
| Hadi Sohrabi1؛ Meghdad Jourgholami2؛ Baris Majnounian3؛ Ghavamoddin Zahedi Amiri3؛ Sattar Ezzati4 | ||
| 1M.Sc. Student of Forest Engineering, Faculty of Natural Resources, University of Tehran, Karaj, Iran | ||
| 2Associate Prof., Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, Iran. | ||
| 3Prof., Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Karaj, Iran | ||
| 4Ph.D. Student, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Iran | ||
| چکیده [English] | ||
| Deforestation and soil degradation start simultaneously, thus the conservation of forest and soil mutually affect each other. Therefore, techniques should be developed to reduce the amount of forest damage which in turn shortens the recovery time. This study was conducted in two districts of Patom and Namkhaneh located in Kheyroud experimental forest, with the aim to assess the environmental impact of slope, traffic and rutting location on soil physical properties and its recovery over a 20-year period. Fourabandoned, downward skid trails of different ages were selected. In each skid trail, three traffic classes each divided into two slope classes were determined. For measurement of soil bulk density and total porosity, a sample plot of 10×4 m was established on each treatment. The results showed the maximum value of the bulk density and penetration resistance to be associated with high traffic intensity and > 20% slopes. Furthermore, soil bulk densities in different skid trails directions older than 20 years were more than those on the control treatment, yet the difference was not significant. However, the difference in resistance to penetration was significant. Over 20 years of skidding operations, soil physical properties have been retrieved, so that the bulk density and penetration resistance were 12.75 and 23.3% more than those in control area. Whereas this difference was not significant for bulk density, it showed significance for penetration resistance. | ||
| کلیدواژهها [English] | ||
| Soil properties recovery, Porosity, skid trail, Penetration resistance, soil bulk density | ||
| مراجع | ||
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