| تعداد نشریات | 286 |
| تعداد نشریات سازمان | 84 |
| تعداد شماره‌ها | 2,944 |
| تعداد مقالات | 33,229 |
| تعداد مشاهده مقاله | 43,866,220 |
| تعداد دریافت فایل اصل مقاله | 20,372,510 |
مقایسه برخی مشخصه‌های کمی قطعه مدیریت‌شده به روش دانگ واحد با قطعه شاهد (مطالعه موردی: جنگل‌های سری سه سنگده) | ||
| تحقیقات جنگل و صنوبر ایران | ||
| مقاله 3، دوره 24، شماره 1 - شماره پیاپی 63، فروردین 1395، صفحه 20-9 اصل مقاله (288.34 K) | ||
| نوع مقاله: علمی- پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijfpr.2016.106684 | ||
| نویسندگان | ||
| سید محمدمهدی رضایی سنگدهی1؛ اصغر فلاح* 2؛ محمدرضا پورمجیدیان2؛ سیدمحمد حجتی2 | ||
| 1کارشناس ارشد جنگل‌داری، شرکت بهره‌برداری و صنایع چوب فریم | ||
| 2دانشیار، گروه جنگل‌داری، دانشکده منابع طبیعی، دانشگاه علوم کشاورزی و منابع طبیعی ساری | ||
| چکیده | ||
| طرح جنگل‌داری سنگده در سال 1348 در قالب شیوه پناهی به اجرا درآمد و برش نهایی بین سال‌های 1370 تا 1374 انجام شد. این پژوهش به‌منظور مقایسه برخی مشخصه‌های کمی قطعه شاهد و یکی از قطعات دانگ واحد با نمونه‌برداری به روش منظم- تصادفی و ابعاد شبکه 150×100 متر در جنگل‌های سری سه طرح جنگل‌داری مذکور انجام شد. نتایج نشان داد که میانگین موجودی در هکتار قطعه شاهد و دانگ به‌ترتیب 464/27 و 240/95 سیلو، میانگین تعداد در هکتار، 232 و 599 اصله، متوسط سطح مقطع در هکتار، 31/69 و 22/74 متر مربع، میانگین قطر درختان، 39/9 و 21 سانتی‌متر، متوسط ارتفاع، 28/3 و 21/27 متر و ساختار جنگل در قطعه شاهد دو و سه‌اشکوبه بود، اما در دانگ یک و دواشکوبه بود. متوسط تعداد در هکتار پایه‌های با قطر کمتر از 12/5 سانتی‌متر (زادآوری) در قطعه شاهد 1487 و در دانگ 715 اصله بود که به‌جز در طبقه قطری 7/5 تا 12/5 سانتی‌متر، در طبقه‌های دیگر فراوانی پایه‌ها در دانگ نسبت به قطعه شاهد کمتر بود. در مورد متوسط موجودی، تراکم، سطح مقطع، قطر و ارتفاع درختان، بین قطعه شاهد و دانگ واحد اختلاف معنی‌داری وجود داشت، بنابراین با این‌که در برخی از مشخصه‌ها نتایج مورد انتظار به‌دست آمد و شیوه مذکور به‌نسبت موفق عمل کرده بود، اما با توجه به وجود پایه‌های مادری و زادآوری پیش‌بجا و آمیختگی، نتایج مورد انتظار به‌دلیل نحوه و دقت اجرای آن با شرایط مطلوب تا حدودی فاصله داشت. | ||
| کلیدواژه‌ها | ||
| طرح جنگل‌داری سنگده؛ نمونه‌برداری منظم- تصادفی؛ زادآوری؛ شیوه پناهی | ||
| عنوان مقاله [English] | ||
| Quantitative characteristics of a forest compartment managed under unique-block with a control compartment (Case study: District 3, Sangdeh forests) | ||
| نویسندگان [English] | ||
| Seyyed Mohammad Mehdi Rezaei Sangdehi1؛ Asghar Fallah2؛ Mohammad Reza Pourmajidian2؛ Seyyed Mohammad Hodjati2 | ||
| 1M.Sc. Forestry, Farim Wood Industries & Logging Company, Sangdeh | ||
| 2Associate Prof., Department of Forestry, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University | ||
| چکیده [English] | ||
| The forest management plan of Sangdeh (Mazandaran province) was first implemented in in1969 under a Shelterwood system, which led to final cuttings conducted between 1991 and 1995. This study was planned to compare some of the major quantitative characteristics of compartments managed under a unique block method to a selected control compartment. The forest inventory was carried out in a systematic random sampling with a 100×150 m grid size.The results showed the average growing stock of 464.27 and 240.95 silve per hectare in control and unique block, respectively. In addition, the average number of trees per ha were 232 and 599 trees, the average basal areas per ha were 22.74 and 31.69 m2, the average tree diameters were 39.90 and 21.00 cm and the average heights were 28,30 and 21,27 m, respectively. Furthermore, the vertical forest structure consisted of three and two stories in control stand, while it consisted of one and maximum two layers in the unique block. The average rates for total regeneration accounted for 1487 and 715 tree per ha in control and unique block, respectively. Furthermore, regeneration frequency in unique block showed a reduction compared to the control for all of class except in 7.5-12.5 cm class. Significant differences were observed for the average stock density, basal area, tree height and diameter between the control and unique block stands. All in all, although the unique block was evaluated relatively successful in the light of the majority of measured characteristics, the achieved results are assessed to be still sup-optimal when considering the mother trees and the expected advanced regeneration mixture. | ||
| کلیدواژه‌ها [English] | ||
| Forest management plan, regeneration, shelterwood, systematic random sampling | ||
| مراجع | ||
|
- Amundson, R., 2001. The carbon budget in soils. Annual Review of Earth and Planetary Sciences, 29: 535-562. - Backeus, S., Wikstrom, P. and Lamas, T., 2005. A model for regional analysis of carbon sequestration and timber production. Forest Ecology and Management, 216: 28-40. - Bakhtiarvand Bakhtiari, S. and Sohrabi, H., 2012. Allometric equations for estimating above and below-ground carbon storage of four broadleaved and coniferous trees. Iranian Journal of Forest and Poplar Research, 20(3): 481-492 (In Persian). - Bayatkashkoli, A., Amiri, S., Faezipour, M. and Dosthosyne, K., 2008. Economical classification of small-diameter poplar utilization in the particle board and ply wood industries. Iranian Journal of Natural Resources, 81: 87-99 (In Persian). - Cannell, M.G.R., 2003. Carbon sequestration and biomass energy offset theoretical, potential and achievable capacities globally in Europe and UK. Biomass and Bioenergy, 24(2): 97-116. - Cannell, M.G.R. and Dewar, R.C., 1993. The Carbon Sinks Provided by Plantation Forests and Their Products in Britain. Published by Institute of Terrestrial Ecology, Scotland, 124p. - Cornic G. and Massacci, A., 1996. Leaf photosynthesis under drought stress: 347-366. In: Baker, N.R., (Ed.). Photosynthesis and the Environment. Kluwer Academic Publisher, Springer, Netherlands. - Corona, P., 2000. Introduction to the sample survey of forest resources. CUSL, Florence, 284p. - Elias, M. and Potvin, C., 2003. Assessing inter and intra-specific variation in trunk carbon concentration for 32 neo tropical tree species. Canadian Journal of Forest Research, 33: 1039-1045. - Fang, S., Xue, J. and Tang, L., 2007. Biomass production and carbon sequestration potential in poplar plantations with different management patterns. Journal of Environmental Management, 85(3): 672-679. - Fang, Sh., Xu, X., Lu, Sh. and Tang, L., 1999. Growth dynamics and biomass production in short-rotation poplar plantations: 6-year results for three clones at four spacing’s. Biomass and Bioenergy, 17: 415-425. - Finer, L., 1996. Variation in the amount and quality of litter fall in a pinus sylvestris L. stand growing on a bog. Forest Ecology and Management, 80(1-3): 1-11. - Fortier, J., Gagnon, D., Truax, B. and Lambert, F., 2010. Nutrient accumulation and carbon sequestration in 6-year-old hybrid poplars in multi clonal agricultural riparian buffer strips. Agriculture Ecosystems and Environment, 137: 276-287. - Gao, Y.H., Luo, P., Wu, N., Chen, H. and Wang, G.X., 2007. Grazing intensity impacts on carbon sequestration in an alpine meadow on the Eastern Tibetan Plateau. Agricultural and Biological Sciences, 3(6): 642-647. - Gower, S.T., Krankina, O., Olson, R.J., Apps, M., Linder, S. and Wang, C., 2001. Net primary production and carbon allocation patterns of boreal forest ecosystems. Ecological Applications, 11(5): 1395-1411. - Hemmati, A. and Modirrahmati, A.R., 2005. Effects of planting space on production per hectare of different P. nigra poplar spacies. Iranian Journal of Natural Resources, 13(3): 343-352 (In Persian). - Howard, J.L., 2001. U.S. Timber Production, Trade, Consumption and Price Statistics 1965-1999. Published by Department of Agriculture, Forest Service, Forest Product Laboratory, Madison, Wisconsin, 90p. - Hu, Y.L., Zeng, D.H., Fan, Z.P., Chen, G.S., Zhao, Q. and Pepper, D., 2008. Changes in ecosystem carbon stocks following grassland afforestation of semiarid sandy soil in southeastern Keerqin Sandy Lands, China. Journal of Arid Environments, 72(12): 2193-2200. - Lal, R., 2004. Soil carbon sequestration to mitigate climate change. Geoderma, 123(1-2): 1-22. - Lemma, B., Kleja, D.B., Nilsson, I. and Olsson, M., 2006. Soil carbon sequestration under different exotic tree species in the south western highlands of Ethiopia. Geoderma, 136: 886-898. - Martin, A.R. and Thomas, S.C.A., 2011. Reassessment of carbon content in tropical trees. PLOS One, 6(8):1-9. - Moghaddam, M.R., 2001. Statistical and Descriptive Ecology of Vegetation. Tehran University Press, Tehran, 285p (In Persian). - Pandey F. and Narayan, D., 2002. Global climate change and carbon management in multi-functional forests. Current Science, 83: 593-602. - Parsapour, M.K., Sohrabi, H., Soltani, A. and Iranmanesh, Y., 2013. Allometric equations for estimating biomass for four poplar species at Charmahal and Bakhtiari province. Iranian Journal of Forest and Poplar Research, 21(3): 528-517 (In Persian). - Ray, R., Majumder, N., Chowdhury, C. and Jana, T.K., 2012. Wood chemistry and density: An analog for response to the change of carbon sequestration in mangroves. Carbohydrate Polymers, 90: 102-108. - Riahifar, N., Fallah, A., Mohammadi Samani, K. and Gorji Mahlebani, Y., 2009. Comparing the growth of Paulownia fortune and Populus deltoids plantations under different spacing in northern Iran. Iranian Journal of Forest and Poplar Research, 16(3): 444-454 (In Persian). - Snowdon, P., Raison, J., Keith, H., Ritson, P., Grierson, P., Adams, M., Montagu, K., Bi, H., Burrows, W. and Eamus, D., 2002. Protocol for Sampling Tree and Stand Biomass. Published by Australian Greenhouse Office, 67p. - Sohrabi, H. and Shirvani, A., 2012. Allometric equations for estimating standing biomass of Atlantic Pistache (Pistacia atlantica var. mutica) in Khojir National Park. Iranian Journal of Forest and Poplar Research, 4(1): 55-64 (In Persian). - Talebi, M., Modir Rahmati, A., Jahanbazi Gojani, H. and Haghighian, F., 2008. Final trial on adaptability of different poplar clones to introduce suitable ones for executive section. Final Report of Research Project, Published by Research Institute of Forests & Rangelands, Tehran, 43p (In Persian). - Walle, I.V., Mussehe, S., Samson, R., Last, N. and Lemeur, R., 2001. The above- and below ground Carbon pools of tow mixed deciduous forest located in East-Flanders, Belgium. Forest Science, 58: 507-517. - William, E., 2002. Carbon Dioxide fluxes in a semiarid environment with high carbonate Soils. Agricultural and Forest Meteorology, 116: 91-102. - Willits, S. and Ross, R., 2004. Veneer Recovery from Small Diameter Stands in South Western Oregon. USDA Forest Service, Pacific Northwest Research Station and Forest Products Laboratory, Portland, Oregon. - Zarinkafsh, M., 1993. Applied Soil Science, Soil Survey and Quantity Analysis of Soil- Water-Plant. Tehran University Press, Tehran, 342p (In Persian). - Zerva, A., Mencuccini, M. and Smith, K., 2004. Effect of Afforestation and Forest Management on Soil Carbon Dynamic and Trace Gas Emission in a Stika Spruce (Picea sitchensis) Forest. Published by Institute of Atmospheric and Environmental Science, Edinburgh, 271p. - Zianis, D., Muukkonen, P., Mäkipää, R. and Mencuccini, M., 2005. Biomass and Stem Volume Equations for Tree Species in Europe. Silva Fennica Monographs 4, the Finish Forest Research Institute, 63p. | ||
|
آمار تعداد مشاهده مقاله: 760 تعداد دریافت فایل اصل مقاله: 549 |
||