کاربرد شاخص های‎ DEI ‎و ‏‎ MEIدر ارزیابی تأثیر قطعه قطعه شدن رویشگاه های بلوط بر تنوع گونه ای و ‏ویژگی های شیمیایی خاک

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری جنگلداری؛ دانشکده منابع طبیعی، دانشگاه ارومیه، ارومیه، ایران

2 دانشیار‎ ،‎گروه‎ ‎جنگلداری،‎ ‎دانشکده‎ ‎منابع‎ ‎طبیعی،‎ ‎دانشگاه‎ ‎ارومیه،‎ ‎ارومیه، ایران

3 مربی پژوهشی بخش تحقیقات جنگلها و مراتع، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان کرمانشاه

4 مربی پژوهشی بخش تحقیقات جنگل ها ومراتع . مرکز تحقیقات کشاورزی و منابع طبیعی استان کرمانشاه

5 مربی، دانشکده مطالعات محیطی، دانشگاه ‏Saint Mary's، هالیفاکس، کانادا

چکیده

برای معرفی و کاربرد شاخص­هایDEI  (Distance of Edge Influence) برای تعیین فاصله­ اثر حاشیه­ای  و MEI (Magnitude of Edge Influence) برای تعیین شدت اثر حاشیه­ای جنگل بر گونه­های علفی و ویژگی­های شیمیایی خاک، سه قطعه­ جنگلی (زیر 10 هکتار)از جنگل­های بلوط استان کرمانشاه­ با شرایط مشابه از نظر شیب، جهت و ارتفاع از سطح دریا انتخاب شد. در هر قطعه سه ترانسکت 150 متری با فاصله­ 200 متر در جهت شیب پیاده شد (اولین ترانسکت به­صورت تصادفی پیاده شد). اندازه­گیری پوشش علفی و ویژگی­های شیمیایی خاک در فواصل 0، 25، 50، 100 و 150 متر انجام شد. نتایج نشان داد مقادیر شاخص MEI برای متغیرهای خاک (غیر از نیتروژن، کربن آلی و pH) مثبت بود. همچنین مقادیر این شاخص برای غنا گونه­ای، تنوع شانون وینر و یکنواختی مثبت بود. مقادیر شاخص DEI برای متغیرهای خاک غیر از pH برابر با 25 متر و برای شاخص­های تنوع برابر با 50 متر بود. تأثیر حاشیه بر غنا گونه­ای، تنوع شانون­وینر و یکنواختی معنی­دار بود. متغیرهای خاک (غیر از فسفر) تفاوت معنی­داری را در فواصل مختلف از حاشیه نشان ندادند. همچنین تغییرات غنا و مشخصات شیمیایی خاک در این جنگل­ها در فاصله­ 50-0 متر دیده ­شد. به­طور کلی در جنگل­های تنک بلوط، فرآیند قطعه­قطعه شدن و اثر حاشیه­ای بر غنا و مشخصات شیمیایی خاک تأثیر می­گذارد.

کلیدواژه‌ها


عنوان مقاله [English]

Application of DEI and MEI indices to evaluate the effect of fragmentation in oak ‎habitats on species diversity and soil chemical characteristics

نویسندگان [English]

  • gelareh valadi 1
  • Javad Eshaghirad 2
  • Yahya Khodakarami 3
  • Mostafa Nemati Peykani 4
  • Karen Harper 5
1 Ph.D. student of Forestry, Department of Forestry. Faculty of Natural Resources Urmia University, I. R. Iran‎
2 Associate professor, Department of Forestry, Faculty of Natural ‎Resources, Urmia University. I. R. Iran‎
3 Senior Research Expert, Forests and Rangelands research Department, Kermanshah Agricultural and ‎Natural Resources. Research and Education Center, AREEO, Kermanshah, I. R. Iran‎
4 Senior Research Expert, Forests and Rangelands research Department, Kermanshah Agricultural and ‎Natural Resources. Research and Education Center, AREEO, Kermanshah. I. R. Iran‎
5 Adjunct Professor, School for Environmental Studies, Saint Mary's University, Halifax, Canada
چکیده [English]

In order to introduce and application of DEI (Distance of Edge Influence) and MEI (Magnitude of Edge Influence) indices to determine the distance of edge effect and intensity of the edge effect on herbaceous species and soil chemical properties, Three forest fragments (under 10 hectares) from oak forests of Kermanshah province were selected with similar conditions in terms of slope, direction and altitude. In each fragment three transects were established from the edge to the forest interior. Measurements of vegetation and soil variables were collected at 0 (edge), 25, 50, 100, 150 m along each transect. The results showed that MEI index values ​​were positive for soil variables (except nitrogen, organic carbon and pH). The values ​​of this index were also positive for species richness, Shannon-Wiener diversity and Evenness. DEI index value ​​was 25 m for soil variables except pH and 50 m for diversity indices. The influence of edge on species richness, Shannon-Wiener diversity and Evenness was significant. Soil variables (except phosphorus) did not show significant differences at different distances from edge. Also, changes in species richness and soil chemical properties were observed in 0-50 m from edge. Totally, in sparse oak forests, fragmentation and edge effect had influence on species richness and soil chemical properties.

کلیدواژه‌ها [English]

  • edge effect
  • forest fragment
  • Herbaceous species
  • Zagros forest
Aguirre-Gutiérrez, J., Are plant species richness and diversity influenced by fragmentation at a micro scale. Int J Biodivers 2014, 9 (10.1155), 2014.
Alignier, A.;  Alard, D.;  Chevalier, R.; Corcket, E., Can contrast between forest and adjacent open habitat explain the edge effects on plant diversity? Acta Botanica Gallica 2014, 161 (3), 253-259.
Aragón, G.;  Abuja, L.;  Belinchón, R.; Martínez, I., Edge type determines the intensity of forest edge effect on epiphytic communities. European Journal of Forest Research 2015, 134 (3), 443-451.
Barbier, S.;  Gosselin, F.; Balandier, P., Influence of tree species on understory vegetation diversity and mechanisms involved—a critical review for temperate and boreal forests. Forest ecology and management 2008, 254 (1), 1-15.
Barros, H. S.; Fearnside, P. M., Soil carbon stock changes due to edge effects in central Amazon forest fragments. Forest Ecology and Management 2016, 379, 30-36.
Brunet, J.;  Fritz, Ö.; Richnau, G., Biodiversity in European beech forests-a review with recommendations for sustainable forest management. Ecological Bulletins 2010, 77-94.
Bunyan, M.;  Jose, S.; Fletcher, R., Edge effects in small forest fragments: why more is better. American Journal of Plant Sciences 2012, 3 (7), 869-878.
Cadenasso, M. L.;  Pickett, S. T.;  Weathers, K. C.; Jones, C. G., A framework for a theory of ecological boundaries. BioScience 2003, 53 (8), 750-758.
Chen, J.;  Franklin, J. F.; Spies, T. A., Growing‐season microclimatic gradients from clearcut edges into old‐growth Douglas‐fir forests. Ecological applications 1995, 5 (1), 74-86.
Colley, R. J.;  Payne, G.; Van Elswijk, M., Microclimate gradients across a forest edge. New Zealand Journal of Ecology 2000, 111-121.
Cong, W. F.;  van Ruijven, J.;  Mommer, L.;  De Deyn, G. B.;  Berendse, F.; Hoffland, E., Plant species richness promotes soil carbon and nitrogen stocks in grasslands without legumes. Journal of ecology 2014, 102 (5), 1163-1170.
Davies-Colley, R. J.;  Payne, G.; Van Elswijk, M., Microclimate gradients across a forest edge. New Zealand Journal of Ecology 2000, 111-121.
Dodonov, P.;  Harper, K. A.; Silva-Matos, D. M., The role of edge contrast and forest structure in edge influence: vegetation and microclimate at edges in the Brazilian cerrado. Plant ecology 2013, 214 (11), 1345-1359.
Dovčiak, M.; Brown, J., Secondary edge effects in regenerating forest landscapes: vegetation and microclimate patterns and their implications for management and conservation. New forests 2014, 45 (5), 733-744.
Eshaghirad, J.; Soleymani, F., Khodakarami, Y., Influence of edge effect on plant composition and distribution in oak forests (Case study: Cheharzebar forests-Kermanshah). Iranian Journal of Forest and Poplar Research 2014, 22 (3), 527-539.  (In Persian)
Freitas, N.;  Silva, F.; Maia, L., Edge effect on soil biochemical and microbiological activities in an Atlantic Forest fragment in the state of Pernambuco, Brazil. Bioremediation, Biodiversity and Bioavailability 2008, 2 (1), 62-67.
Gehlhausen, S. M.;  Schwartz, M. W.; Augspurger, C. K., Vegetation and microclimatic edge effects in two mixed-mesophytic forest fragments. Plant Ecology 2000, 147 (1), 21-35.
Guirado, M.;  Pino, J.; Roda, F., Understorey plant species richness and composition in metropolitan forest archipelagos: effects of forest size, adjacent land use and distance to the edge. Global Ecology and Biogeography 2006, 15 (1), 50-62.
Harper, K. A.;  Lesieur, D.;  Bergeron, Y.; Drapeau, P., Forest structure and composition at young fire and cut edges in black spruce boreal forest. Canadian Journal of Forest Research 2004, 34 (2), 289-302.
Harper, K. A.;  Macdonald, S. E.;  Mayerhofer, M. S.;  Biswas, S. R.;  Esseen, P. A.;  Hylander, K.;  Stewart, K. J.;  Mallik, A. U.;  Drapeau, P.; Jonsson, B. G., Edge influence on vegetation at natural and anthropogenic edges of boreal forests in C anada and F ennoscandia. Journal of Ecology 2015, 103 (3), 550-562.
Harper, K. A.; Macdonald, S., Quantifying distance of edge influence: a comparison of methods and a new randomization method. Ecosphere 2011, 2 (8), 1-17.
Honnay, O.;  Verheyen, K.; Hermy, M., Permeability of ancient forest edges for weedy plant species invasion. Forest Ecology and Management 2002, 161 (1-3), 109-122.
Laurance, W. F., Have we overstated the tropical biodiversity crisis? Trends in Ecology & Evolution 2007, 22 (2), 65-70.
Magnago, L. F. S.;  Magrach, A.;  Barlow, J.;  Schaefer, C. E. G. R.;  Laurance, W. F.;  Martins, S. V.; Edwards, D. P., Do fragment size and edge effects predict carbon stocks in trees and lianas in tropical forests? Functional ecology 2017, 31 (2), 542-552.
Magurran, A. E., Measuring biological diversity blackwell science. Biological diversity: frontiers in measurement and assessment. Oxford 2004, 105
Marchand, P.; Houle, G., Spatial patterns of plant species richness along a forest edge: what are their determinants? Forest Ecology and Management 2006, 223 (1-3), 113-124.
Mendes, P. G. A.;  Silva, M. A. M.;  Guerra, T. N. F.;  Lins-e-Silva, A. C. B.;  Cavalcanti, A. d. D. C.;  Sampaio, E. V. d. S. B.; Rodal, M. J. N., Dynamics and Edge Effect of an Atlantic Forest Fragment in Brazil. Floresta e Ambiente 2016, 23, 340-349.
Mirzai, J., Causes and factors of degradation of Zagros forests and strategies to deal with them, the first national conference on strategies for achieving sustainable development, Tehran, 2012; pp. 88-98. (In Persian)
Murcia, C., Edge effects in fragmented forests: implications for conservation. Trends in ecology & evolution 1995, 10 (2), 58-62.
Normann, C.;  Tscharntke, T.; Scherber, C., How forest edge–center transitions in the herb layer interact with beech dominance versus tree diversity. Journal of Plant Ecology 2016, 9 (5), 498-507.
Phillips, O. L.;  Rose, S.;  Mendoza, A. M.; Vargas, P. N., Resilience of southwestern Amazon forests to anthropogenic edge effects. Conservation biology 2006, 20 (6), 1698-1710.
Ribeiro, J. T.; Nunes-Freitas, A. F., Uzêda, M. C., Forest fragmentation and impacts of intensive agriculture: responses from functional groups of the tree community. BioRxiv 2019, 546796
Ries, L.;  Fletcher Jr, R. J.;  Battin, J.; Sisk, T. D., Ecological responses to habitat edges: mechanisms, models, and variability explained. Annu. Rev. Ecol. Evol. Syst. 2004, 35, 491-522.
Robinson, W. D.; Sherry, T. W., Mechanisms of avian population decline and species loss in tropical forest fragments. Journal of Ornithology 2012, 153 (1), 141-152.
Ruwanza, S., The edge effect on plant diversity and soil properties in abandoned fields targeted for ecological restoration. Sustainability 2019, 11 (1), 140.
Salehzadeh, O.;  Eshaghirad, J.; Maroofi, H., The effect of anthropogenic disturbance on flora and plant diversity in Oak forests of west (Baneh city). Forest Research and Development 2016, 2 (3), 219-240. (In Persian)
Schröder, T.; Fleig, F. D., Spatial patterns and edge effects on soil organic matter and nutrients in a forest fragment of southern Brazil. Soil Research 2017, 55 (7), 649-656.