تأثیر تغییرات فصلی و تاج‌پوشش درختان بر تراکم و زی‌وزن کرم خاکی در جنگل دانه‌زاد بلوط ایرانی (Quercus brantii)

نوع مقاله: علمی- پژوهشی

نویسندگان

1 کارشناس ارشد، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

2 دانشیار، دانشکده علوم جنگل، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

چکیده

جمعیت کرم خاکی به‌عنوان یک عامل زیستی بر سلامت و تولید بوم‌سازگان‌ جنگل تأثیر دارد. تراکم و زی‌وزن کرم خاکی نمایان‌گر فعالیت زیستی و کیفیت خاک است. به‌کارگیری ویژگی‌ها و قابلیت‌های اکولوژیک کرم خاکی در مدیریت جنگل‌های زاگرس مستلزم شناخت وضعیت فعلی فعالیت زیستی این جاندار و عامل‌های محیطی مؤثر بر آن است. این پژوهش با هدف تعیین تراکم و زی‌وزن کرم خاکی و شناخت ارتباط آن‌ها با عامل‌های محیطی شامل تغییرات فصل، عمق خاک و تاج‌پوشش درختان در جنگل دانه‌زاد بلوط ایرانی (Quercus brantii Lindl.) در سامان عرفی داربر خرم‌آباد، استان لرستان انجام شد. پس از انتخاب 32 درخت، تراکم و زی‌وزن کرم خاکی در فصل‌های بهار و پائیز در زیر و خارج از تاج‌پوشش درختان با حفر گوده خاک به عمق 50 سانتی‌متر در سه لایه شامل صفر تا 10، 10 تا 30 و 30 تا 50 سانتی‌متر اندازه‌گیری شد. مقایسه میانگین‌های تراکم و زی‌وزن کرم خاکی با استفاده از تجزیه واریانس و آزمون t مستقل در سطح اطمینان 95 درصد انجام شد. نتایج پژوهش نشان داد که تغییرات فصل، عمق لایه‌های خاک و تاج‌پوشش درختان بر تراکم و زی‌وزن کرم خاکی تأثیر معنی‌دار داشت. همچنین، تراکم و زی‌وزن کرم خاکی در فصل پائیز و نیز در عرصه‌های خارج از تاج‌پوشش درختان کاهش یافت. در طرح‌های مدیریت منابع جنگلی زاگرس، کاهش عامل‌های مخرب در لایه‌های سطحی خاک و افزایش انبوهی تاج‌پوشش می‌تواند با فراهم کردن شرایط مطلوب برای فعالیت زیستی کرم خاکی، موجب بهبود کیفیت خاک و ارتقاء سلامت بوم‌سازگان شود.

کلیدواژه‌ها


عنوان مقاله [English]

Impact of seasonal variation and tree canopy on density and biomass of earthworm in Brant’s oak (Quercus brantii Lindl.) high forest

نویسندگان [English]

  • Samira Beiranvand 1
  • Ramin Rahmani 2
  • Hashem Habashi 2
1 M.Sc. Forestry, Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
2 Associate Prof., Faculty of Forest Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
چکیده [English]

Earthworm population, as a biotic factor, affects health and productivity of forest ecosystems. Earthworm density and biomass indicates biological activities and quality of soils. In order to get the benefit of earthworm ecological potential in Zagros forest management, the current biological activities as well as environmental factors impacting of this invertebrate have to be understood. This study aims at determining the density and biomass of earthworm and investigating their relationships to environmental factors including seasonal variability, soil depth and the tree canopy in Brant’s oak (Quercus brantii Lindl.) high forest of Darber area (Khoram Abad, Lorestan). Thirty two single-stem trees of Brant’s oak were sampled. Earthworm’s density and biomass were measured in spring and autumn, under and away from the canopy, using soil profile. Soil profiles were 50 cm deep and samples were taken from layers at 0-10, 10-30, and 30-50 cm depth. Means of earthworm’s density and biomass were compared using one way ANOVA and independent t-test at the 95% probability level. The results of this study showed that seasonal variation, soil layers depth and tree canopy had significant impacts on earthworm’s density and biomass. Earthworm’s density and biomass were decreased in autumn and also in spots away from tree canopy. Minimizing topsoil disturbance and expanding canopy coverage in managing Zagros forest resources could optimize the environmental conditions for earthworm biological activity, which would improve soil quality and ecosystem health.

کلیدواژه‌ها [English]

  • Lorestan
  • soil layers
  • Zagros forests

- Anonymous, 2006. Multifunctional Forest Management Plan of Ghale-Gol. Published by Forests, Range and Watershed Management Organization, Tehran, 110p (In Persian).

- Aubert, M., Hedde, M., Decaëns, T., Bureau, F., Margerie, P. and Alard, D., 2002. Effects of tree canopy composition on earthworms and other macro-invertebrates in beech forests of Upper Normandy (France). Pedobiologia, 47: 904-912.

- Beiranvand, M. and Kooch, Y., 2016. Effect on hardwood tree species abundance and diversity of earthworms in lowland forest ecosystems. Journal of Soil Biology, 1(4): 16-25. (In Persian)

- Blouina, M., Hodsonb, M.E., Delgadoc, E.A., Bakerd, G., Brussarde, L., Buttf, K.R., Daig, J., Dendoovenh, L., Peresi, G., Tondohj, J.E., Cluzeauk, D. and Brunl, J.J., 2013. A review of earthworm impact on soil function and ecosystem services. European Journal of Soil Science, 64(2): 161-182.

- Edwards, C.A. and Bohlen, P.J., 1996. Biology and Ecology of Earthworms. Chapman and Hall, London, 426p.

- Frouz, J., Livecková, M., Albrechtová, J., Chronáková, A., Cajthaml, T., Pizl, V., Hánel, L., Stary, J., Baldrian, P., Lhotáková, Z., Šimácková, H. and Cepáková, H., 2013. Is the effect of trees on soil properties mediated by soil fauna? A case study from post-mining sites. Forest Ecology and Management, 309: 87-95.

- Goswami, R. and Mondal, C.K., 2015. A study on earthworm population and diversity with special reference to physicochemical parameters in different habitats of south 24 parganas district in west Bengal. Zoological Survey of India, 115(1): 31-38.

- Hajizadeh, A., 1990. Agricultural Pedology. Islamic Azad University, Scientific Publications Center, 186p. (In Persian)

- Hlava, J. and Kopecký, O., 2013. Earthworm population responses to deciduous forest soil acidity and vegetation cover. Scientia Agriculturae Bohemica, 44(3): 133-137.

- Irannejad, E. and Rahmani, R., 2009. Evaluation of earthworm abundance and vertical distribution pattern in some forest types of Shast-Kolateh. Iranian Journal of Forest and Wood Products (Iranian Journal of Natural Resources), 62(2): 145-157 (In Persian).

- Ivask, M., Kuu, A., Truu, M. and Truu, J., 2006. The effect of soil type and soil moisture on earthworm communitIes. Caribbean Journal of Science, 42(3): 301-310.

- Jamatia, S.K.S. and Chaudhuri, P.S., 2017. Earthworm community structure under tea plantations (Camellia sinensis) of Tripura (India). Tropical Ecology, 58(1): 105-113.

- Jazirehi, M.H. and Ebrahimi Rostaghi, M., 2003. Silviculture in Zagros. University of Tehran Press, 558p (In Persian).

- Jiménez, J.J. and Decaëns, T., 2000. Vertical distribution of earthworms in grassland soils of the Colombian Llanos. Biology and Fertility of Soils, 32: 463-473.

- Joshi, N. and Aga, S., 2009. Diversity and distribution of earthworms in a subtropical forest ecosystem in Uttarakhand, India. The Natural History Journal of Chulalongkorn University, 9(1): 21-25.

- Kalu, S., Koirala, M. and Khadaka, U.R., 2015. Earthworm population in relation to different land use and soil characteristics. Journal of Ecology and the Natural Environment, 7(5): 124-131.

- Karami, P., Hosseini, S.M., Rahmani, A., Kooch, Y. and Mokhtari, J., 2014. The effects of pure and mixed plantations of alder (Alnus subcordata C. A. Mey.) and poplar (Populus deltoides Marsh.) on earthworm abundance and biomass. International Journal of Environmental Engineering Research, 3(1): 7-14 (In Persian).

- Kooch, Y. and Haghverdi, K., 2014. Earthworms-good indicators for forest disturbance. Journal of BioScience and Biotechnology, 3(2): 155-162.

- Kooch, Y., Hosseini, S.M., Mohammadi, J. and Hojjati, S.M., 2010. The effects of gap disturbance on soil chemical and biochemical properties in a mixed beech-hornbeam forest of Iran. Ecologia Balkanika, 2: 39-56.

- Lakzian, A., Sheybani, S., Bahadorian, M. and Shaddel, L., 2005. Soil Microbiology. Sokhan Gostar Publication, Mashhad, 556p (In Persian).

- Lemtiri, A., Colinet, G., Alabi, T., Cluzeau, D., Zirbes, L., Haubruge, E. and Francis, F., 2014. Impacts of earthworms on soil components and dynamics: A review. Biotechnology, Agronomy, Society and Environment, 18(1): 121-133.

- Leon, Y.S., Zou, X., Borges, S. and Ruan, H., 2003. Recovery of native earthworms in abandoned tropical pastures. Conservation Biology, 17(4): 1-8.

- López-Hernández, D., 2012. Earthworm populations in savannas of the Orinoco basin: A review of studies in long-term agricultural-managed and protected ecosystems. Agriculture, 2(2): 87-108.

- Mohammadnezhad Kiasari, Sh., Sagheb-Talebi, Kh., Rahmani, R. and Ghasemi Chapi, O., 2009. Seasonal variation of earthworm abundances and biomass in natural forests and plantations (North of Iran). Caspian Journal of Environmental Sciences, 7(2): 87-98.

- Pourreza, M., Hosseini, S.M., Safari Sinegani, A.A., Matinizadeh, M. and Dick, W., 2014. Effect of fire severity on soil macrofauna in Manna oak coppice forests. Iranian Journal of Forest and Poplar Research, 21(4): 729-741 (In Persian).

- Rahmani, R. and Saleh-Rastin, N., 2000. Abundance, vertical distribution and seasonal changes in earthworm populations of oak-hornbeam, hornbeam and beech forests in Neka, Caspian Forests, Iran. Iranian Journal of Natural Resources, 53(1): 37-52 (In Persian).

- Sagheb Talebi, Kh., Sajedi, T. and Pourhashemi, M., 2014. Forests of Iran: A Treasure from the Past, A Hope for the Future. Springer, 152p.

- Sayad, E., Hosseini, S.M., Hosseini, V. and Salehe-Shooshtari, M.H., 2012. Soil macrofauna in relation to soil and leaf litter properties in tree plantations. Journal of Forest Science, 58(4): 170-180.

- Shashkov, M., 2013. Comparison of earthworm communities (Oligochaeta, Lumbricidae) in young and old-growth forests in the State Nature Reserve ‘Kaluzhskie Zaseki’ (Kaluga Region, Russia). Proceedings of the 6th International Oligochaete Taxonomy Meeting. Portugal, 22-25 Apr. 2013: 59-72.

- Singh, A., Saha, P., Kumari, S. and Sinha, M.P., 2012. Impact of different litters on growth and production of a megascolecid earthworm (Perionyx sansibaricus) experimental condition. African Journal of Agricultural Research, 7(39): 5381-5386.

- Singh, S., Singh, J. and Vig, A.P., 2016. Effect of abiotic factors on the distribution of earthworms in different land use patterns. The Journal of Basic and Applied Zoology, 74: 41-50.