نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری، دانشکده کشاورزی، دانشگاه صنعتی اصفهان
2 استاد، دانشکده کشاورزی، دانشگاه صنعتی اصفهان
چکیده
پرداختن به مفهوم تنوع خاک در گستره زمین‌نما به عنوان مجموعه‌ای از واحدهای اراضی متفاوت با توزیع مکانی، شکل و آرایش مختلف که متاثر از پدیده‌های طبیعی و فعالیت‌های انسانی هستند، برای استفاده بهینه، مدیریت مناسب و حفاظت از این منبع با ارزش، ضروری به نظر می‌رسد. در مطالعه حاضر، بررسی روابط بین تکامل خاک- زمین‌نما در یک توالی سلسله مراتبی از سطوح مختلف رده‌بندی خاک‌ها و سطوح ژئومرفیک مختلف با استفاده از شاخص‌های تنوع در بخشی از اراضی دشت جونقان، استان چهارمحال و بختیاری، به عنوان نمونه‌ای از مناطق نیمه‌خشک کشور مورد مطالعه قرار گرفت. در این منطقه سه رده انتی‌سولز، اینسپتی‌سولز و مالی‌سولز به عنوان رده‌های غالب خاک شناسایی شدند. طبق نتایج به دست آمده مهم‌ترین عوامل موثر بر تکامل خاک‌ها در منطقه، پستی و بلندی، مواد مادری و به صورت موضعی سطح بالای آب زیر زمینی بوده است. همچنین روند تغییرات شاخص‌های تفرق در سلسله مراتب ژئومورفیک نشان داد که با کاهش سطح سلسله مراتب این شاخص‌ها سِیر افزایشی داشته‌اند. نتایج همچنین نشان داد تفرق خاک نیز در منطقه مطالعاتی، با کاهش سطح سلسله مراتب رده‌بندی در سیستم USDA افزایش یافته است. اطلاعات به دست آمده از این پژوهش را می‌توان در شناسایی و تفکیک انواع کلاس‌ها و نقشه‌برداری خاک به کار برد و چنین انتظار می‌رود که با افزایش تنوع در سطوح سلسله مراتب طبقه‌بندی، از خلوص نقشه‌های تهیه شده کاسته شود.
کلیدواژه‌ها
عنوان مقاله [English]
Study of relationship between soil diversity index and soil-landscape evolution in Juneqan plain, Chaharmahal-Va-Bakhtiyari Province
نویسندگان [English]
- Najmeh Asgari hafshejani 1
- shamsollah ayoubi 2
1 IUT
2 IUT
چکیده [English]
Study of relationship between soil diversity index and soil-landscape evolution in Juneqan plain, Chaharmahal-Va-Bakhtiyari Province
ABSTRACT ARTICLE HISTORY
Introduction Addressing the concept of soil diversity over landscape as a set of different land units with different spatial distribution, shape, and arrangement that are affected by natural phenomena and human activities is essential for optimal use, proper management and conservation of this valuable resource. Soil diversity is a criterion for quantifying soil variability that deals with changes in soil properties or classes and understanding of the structure of these changes in the area. Soils evolve continuously under the interactive effects of propulsion and backward pathways, factors, processes, and endogenous and exogenous conditions. In other words, the development of soils is a function of divergent pedogenic pathways (increasing soil evolution followed by increasing soil diversity) and converging (increasing soil evolution and subsequently increasing soil uniformity). In the present study, we investigate the relationships between soil-landscape evolution in a hierarchical sequence of different soil classification and geomorphic levels using diversity indices in some parts of Juneqan plain, Chaharmahal va Bakhtiari province, as an example of semi-arid regions.
Materials and Methods The study region with an area of nearby 16000 hectares is located in the Juneqan plain, Charmahal va Bakhtiari Province, Iran, between the coordinates 50° 33ʹ and 50°44ʹE longitude, and 32° 5' and 32°16ʹN latitude. Based on the US Soil Taxonomy (Soil Survey Staff, 2014), the study area has a Mesic soil temperature regime and the soil moisture regime is mainly Xeric and partially Aquic over the study area. A total of 102 soil profiles were dug, described and classified up to the great group level according to US Soil Taxonomy system and soil samples were collected from various genetic horizons. Mountain, hill, piedmont and low lands were the main detected landscapes in the studied area. In order to study the soil evolution the spatial structure of landscape changes, pedodiversity indices were calculated at different taxonomy hierarchical levels (from order to great group in Soil Taxonomy classification) and geomorphic hierarchical levels (landscape, landform, lithology and geomorphic surface) using appropriate indices such as the Shannon diversity index, richness index, Margalef Index, Menhinick Index and O’Neill index.
Results and Discussion The soils in the studied area were classified in three main soil orders including Entisols, Inceptisols and Mollisols. The results demonstrated that soil evolution in the studied area was mainly influenced by topography, parent material and locally the underground water level. In the higher lands (like mountain and hills), the lowest evolution was observed whereas, more evolved soils were observed in lower lands with more stable conditions. The results also indicated that all of the pedodiversity indices showed nearby a similar trend and increased under the decrease of the taxonomy and geomorphic hierarchy levels. So that, the minimum diversity was related to order and landscape levels and the maximum diversity was observed in soil great group and geomorphic surfaces levels. Besides, there was a positive linear relationship between species richness index and area of landform units. In other words, as the area of landform units increases, the diversity and consequently the richness index increases. The results also show a positive and nonlinear relationship between number of observations and Shannon entropy index and species richness index.
Conclusion The obtained result showed that soil evolution and its properties is affected by some soil formation factors including parent material and topography. In conclusion, it seems, diversity indices are powerful tools in the demonstration of quantitatively soil diversity and provide useful information for soil mapping and optimum soil management purposes. In this study, different soil differentiation indices were calculated and reported for the level of classification hierarchy as well as geomorphic hierarchy. The results showed that by decreasing the level of hierarchy, the dispersion indices increased. This upward trend indicates that the soil evolution is divergent in this region and that as the soil evolves, its dispersal increases. The results also showed that by increasing the area of earthquake surfaces, both species richness index and Shannon entropy index increased. Also, a positive and non-linear relationship was observed between both Shannon entropy indices and species richness indices. Increasing soil richness and dispersion index in geomorphic hierarchy and soil classification as well as increasing richness and Shannon indexes with increasing extent of earthquake surfaces indicate that the soils studied are a nonlinear dynamic system.
Keywords: Diversity index, Geomorphology map, Landscape, Landform, Topography.
All right reserved.
Received
Received in revised form
Accepted
Key words:
Diversity index
Geomorphology map < br /> Landscape
Landform
Topography
* Corresponding author
ayoubi@cc.iut.ac.ir
کلیدواژه‌ها [English]
- Diversity index
- Geomorphology map
- Landscape
- Landform Topography
References
- Abbaszadeh Afshar, F., Ayoubi, Sh., Jafari, A., and Khademi, H. 2015. Considering soil diversity index and soil-landscape evolution relationship in the arid region of Bam, southeast Iran. Journal of Soil Management and Sustainable Production, 5(2): 71-91.
- Afroozi, M. and Mohammadzadeh, H. 2011. Assessment and Zoning of Farsan-Juneqan Aquifer Vulnerability to Pollution Using DRASTIC Indicators in GIS Environment. 15th symposium of geological society of Iran. 14-15 December. Tarbiat Moalem uviversity.
- Bonifacio, E., Zanini, E., Boero, V., and Franchini Angela, M. 1997. Pedogenesis in soil catena on serpentinite in north western Italy. Geoderma, 75: 33-51.
- Costantini E.A.C., Lessovaia, S., and Vodyanitskii, Yu. 2006. Using the analysis of iron and iron oxides in paleosols (TEM, geochemistry and iron forms) for the assessment of present and past pedogenesis. Quaternary International, 156–157: 200–211.
- Dethier D.P., Birkeland P.W., and McCarth J.A. 2012. Using the accumulation of CBD-extractable iron and clay content to estimate soil age on stable surfaces and nearby slopes, Front Range, Colorado. Geomorphology, 173-174: 17-29.
- Esfandiarpoor Borujeni, E., Toomanian, N., Salehi, M.H., and Mohammadi, J. 2009. Assessing geopedological soil mapping using diversity and similarity indices (A case study: Borujen area, Chaharmahal-Va-Bakhtiari province). Journal of Water and Soil Science, 23: 100-114.
- Falahati Marvast, S. 2014. Google Earth images to determine the potential variability of surface soil properties and soil classes in the Marvast area, Yazd Province. M.Sc. thesis. Isfahan University of Technology, Isfahan.
- Guo, Y., Gong, P., and Amundson, R. 2003. Pedodiversity in the United States of America. Geoderma, 117: 99–115.
- Ibanez, J.J., De Alba, S., Bermudes, F.F., and Garcia-Alvarez, A. 1995. Pedodiversity: concepts and measurements. Catena, 24: 215–232.
- Jafari, A., Ayoubi, S., Khademi, H., Finke, P.A., and Toomanian, N. 2013. Selection of a taxonomic level for soil mapping using diversity and map purity indices: a case study from an Iranian arid region. Geomorphology, 201: 86-97.
- Keshtkar, S., Jafari, A., and Farpoor, M.H. 2018. The effect of environmental and pedogenic factors on soil diversity in Kerman and Lalehzar regions. Journal of Soil Management and Sustainable Production. 8(1): 89-106.
- Magurran, A.E. 1988. Why diversity? PP. 1-5. In: Ecological diversity and its measurement. Croom Helm, London, 178 p.
- McBratney A.B. and Minasny, B. 2007. On measuring pedodiversity. Geoderma, 141: 149–154.
- Minasny, B. and McBratney, A.B. 2016. Digital soil mapping: a brief history and some lessons. Geoderma, 264: 301–311.
- Moameni, A. and Zink, J.A. 1997. Application of statistical quality control charts and geostatistics to soil quality assessment in a semi-arid environment of south-central Iran. International Institute for Aerospace Survey and Earth Sciences (ITC), Enschede, the Netherlands.
- Naseri, M. 1989. Effect of climate and topography on the formation of soils in Gorgan area. M.Sc. thesis. Tehran University.
- O᾽Neill, R.V., Krummel, J.R., Gardner, R.H., Sugihara, G., Jackson, B., Deangelis, D.L., Milne, B.T., Turner, M.G., Zygmunt, B., Christensen, S.W., Dale, V.H. and Graham, R.L. 1988. Indices of landscape pattern. Landscape Ecology, 1:153-162.
- Phillips, J.D. 1998. On the relationship between complex systems and the factorial model of soil formation (with discussion). Geoderma, 86: 1-21.
- Raheb, A. and Haidari, A. 2012. An investigation of oxidoreduction condition and some electrochemical, chemical and mineralogical characteristics of paddy and nonpaddy soils. Iranian Journal of Soil and Water Research, 43(1): 47-54.
- Rahman, S., Munn, L.C., Zhang, R., and Vance, G.F. 1996. Rocky mountain forest soils. Evaluating spatial variability using conventional statistics and geostatics. Canadian Journal of Soil Science, 79: 501-507.
- Saldana, A. and Ibanez, J.J. 2004. Pedodiversity analysis at large scales: An example of three fluvial terrain of the Henares River (Central Spain). Geoderma, 62: 123-138.
- Shannon, C.E. and Weaver, W. 1948. The mathematical theory of communication. University of Illinois press, Urbana, 237 p.
- Soil Survey Staff. 2014. Keys to Soil Taxonomy, 12th USDA Natural Resources Conservation Service, USA.
- Toomanian, N., Jalalian, A., Khademi, H., Karimian Eghbal, M., and Papritz, A. 2006. Pedodiversity and pedogenesis in Zayandeh-rud Valley, Central Iran. Geomorphology, 81(3), 376-393.
- Whittaker, R.H. 1977. Evolution of species diversity in land communities. In: Hecht, M.K. and Steere, B.W.N.C. (Eds). Evolutionary Biology, Plenum Press, New York. pp: 1-67.
- Zeraatpisheh, M., Ayoubi, S., Jafari, A., and Finke, P. 2017.Comparing the efficiency of digital and conventional soil mapping to predict soil types in a semi-arid region in Iran. Geomorphology, 285: 186–204.
- Zeraatpisheh, M., Ayoubi, Sh., Khademi, H., and Jafari, A. 2019. Investigation of Pedodiversity Indices, Soil Differentiation and Soil-Landscape Evolution in the Semi-Arid Region of Chaharmahal-Va-Bakhtiyari Province. Journal of Water and Soil Science, 23(1): 67-86.
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