Soil erosion study of the gobi desert region using the cesium-137 isotope method

(A case study of the Orog lake are)

Authors

  • Batkhishig Ochirbat Division of Soil Science, Institute of Geography and Geoecology, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
  • Oyunbat Purevsuren Division of Soil Science, Institute of Geography and Geoecology, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
  • Samdandorj Manaljav Division of Soil Science, Institute of Geography and Geoecology, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia

DOI:

https://doi.org/10.5564/mjgg.v59i43.2514

Keywords:

Cesium 137, Gobi desert, Mongolia, Soil, Soil erosion

Abstract

This case study of the Orog Lake area in southwest Mongolia aimed to identify the gobi desert soil erosion and redistribution rate using radioactive Cesium-137 isotope and was carried out in 2017. In total, 67 soil samples were collected from 15 cm depth using the core sampling method and analyzed in the laboratory for soil chemical properties and Cesium-137 isotope. For the identification of the soil erosion and redistribution rate, Profile Distribution Model was used. The study area was dominated by Gobi Brown soils with an average SOM value of 0.89%, pH value of 7.9, and calcium carbonate of 4.4 %. The average soil erosion rate of the Orog lake area was 12.57 t ha-1 y -1 . The maximum soil erosion was -40.87 t ha-1 y -1 at the north slopes of Ikh Bogd mountain and the highest soil accumulation rate (7.55 t ha-1 y -1 ) was found in the Solonchak soils in the meadow shoreline of the Orog lake. The soil erosion near the soum settlement area was 30.9 % higher than in the other areas and it was probably due to the impact of human activity and overgrazing. The soil erosion at the northwest windward side of the Orog lake was 14.0 t ha-1 y -1 , which was 38.7 % higher than the east wind leeward side. Besides global warming has negatively impacted soil erosion, livestock number, which has increased 3.2 times within the last 30 years (1987-2017), has become the major factor impacting soil erosion. Therefore, it is important to promote soil conservation activities and to reduce livestock numbers near the soum center to minimize the soil erosion of the Gobi region.

Говийн бүсийн хөрсний эвдрэлийг Цези-137 изотоп ашиглан судалсан дүн (Орог нуур  орчмын жишээн дээр)

ХУРААНГУЙ

Говийн бүс нутгийн хөрсний эвдрэл, элэгдэл хуримтлалын зэргийг цацраг идэвхт Цези-137 изотопин арга ашиглан тодорхойлох зорилгоор Монгол орны баруун-урд хэсэг Орог нуур орчим нутгийн жишээн дээр судалгааг 2017 онд хийлээ. Судалгаа явуулсан нутгаас нийт 67 ш. хөрсний дээжийг 15 см-ын гүнээс "Core" аргаар авч, лабораторид хөрсний ерөнхий үзүүлэлтүүд болон Цези-137 изотопыг тодорхойлсон. Хөрсний элэгдэл, хуримтлалын зэргийг тооцоолоход Profile Distribution Model загвар ашиглалаа. Орог нуур орчим говийн бор хөрс зонхилон тархаж хөрсний органик бодис дунджаар 0.89 %, урвалын орчин (рН) 7.9, карбонат 4.4 % байна. Судалгаагаар говийн хөрснөөс жилд 1 га газраас дунджаар 12.57 (т га-1 ж -1 ) тонн хөрс эвдрэлд орж алдагдаж байгааг тогтоов. Их Богд уулын ар хажууд хөрсний хамгийн их эвдрэл -40.78 т га-1 ж -1 хүрсэн бол Орог нуурын эрэг орчмын нугархаг газрын Хужирлаг хөрсөнд хамгийн их хуримтлалтай (7.55 т га-1 ж -1 ) байна. Сумын төв орчмын хөрсний эвдрэл нь бусад харьцуулж буй газраас 30.9 % илүү байгаа нь хүн, мал, машин зэрэг хүчин зүйлстэй холбон тайлбарлах үндэслэлтэй. Орог нуурын баруун-хойд салхин талын хөрсний эвдрэл дунджаар 14.0 т га-1 ж -1 буюу нуурын зүүн хэсгийн хөрснөөс 38.7 % илүү байна. Хөрсний эвдрэлд уур амьсгалын дулаарал сөрөг нөлөө үзүүлэхээс гадна малын тоо толгой 30 жил(1987-2017) 3.2 дахин өссөн нь хөрс эвдрэлд оруулах гол хүчин зүйл болж байна. Говийн бүсийн хөрсний эвдрэлийг багасгахад сумын төв орчмын хөрс хамгаалах үйл ажиллагааг идэвхжүүлж малын тоо толгойг бууруулах бодлого баримтлах шаардлагатай.

Түлхүүр үгс: Говь, Монгол, Цези-137, Хөрс, Хөрсний эвдрэл

Abstract
130
PDF 131

References

H. Blanco and R. Lal, Principles of Soil Conservation and Management, The Netherlands: Springer, 2008.

L. Jiyuan, Q. Yongqing, S. HuaDing, Z. Dafang and H. Yunfeng, "Estimation of wind erosion rates by using 137 Cs tracing technique: A case study in Tariat-Xilin Gol transect, Mongolian Plateau," Chinese Science Bulletin, 53, pp. 753-755, 2008. Available: https://doi.org/10.1007/s11434-008-0007-0

N. Mandakh, J. Tsogtbaatar, D. Dash and S. Khudulmur, "Spatial assessment of soil wind erosion using WEQ approach in Mongolia," Journal of Geographical Sciences, vol. 26, pp. 473-483, 2016. Available: https://doi.org/10.1007/s11442-016-1280-5

E. Fulajtar, L. Mabit, C. Renschler and L. Z. Yi, Use of 137 Cs for soil erosion assessment, Rome. Italy: FAO/IAEA, 2017. ISO, 11464:2006. Soil quality-Pretreatment of samples for physico-chemical analysis..

H. Kato, Y. Onda, Y. Tanaka, M. Tsujimura, G. Davaa and D. Oyunbaatar, "Evaluating soil erosion history using fallout radionuclides in semi-arid grassland, Mongolia," Geophysical Research Abstracts. Europ. Geosciences Union, vol. 8, 2006.

O. Batkhishig, "Human Impact and Land Degradation in Mongolia," in “Dry land East Asia: Land Dynamics Amid Social and Climate Change”. Editors: Jiquan Chen, Shiquang Wan, Geoffrey Henebry, Beijing, Higher education press, 2013, pp. 265-281. Available: https://doi.org/10.1515/9783110287912.265

K. Hirose, Y. Kikawada, Y. Igarashi, H. Fujiwara, J. D, Y. Matsumoto, N. Nomura and T. Oi, "Plutonium, 137Cs and uranium isotopes in Mongolian surface soils," Journal of Environmental Radioactivity, vol. 166, pp. 97-103, 2017. Available: https://doi.org/10.1016/j.jenvrad.2016.01.007

O. Batkhishig and T. Telmen, "Soil erosion and Soil organic carbon in the forest-steppe zone: A case study in Baga Mukhar, west Khentei, Mongolia. Proceedings of the 2021 third Conference ESTIC.," Advances in Engineering Resaerch, vol. 206, pp. 7-13, 2021.

F. Lehmkuhl, J. Grunert, D. Hulle, O. Batkhishig and G. Stauch, "Paleolakes in the Gobi region of southern Mongolia," Quaternary Science Reviews, vol. 179, pp. 1-23, 2018. Available: https://doi.org/10.1016/j.quascirev.2017.10.035

L. Mabit, S. Chhem-Kieth, P. Dornhofer, A. Toloza, M. Benmansour, C. Bernard, E. Fulajtar and D. Walling, A widely used and validated medium-term soil tracer. Guidelines for using fallout radionuclides to assess erosion and effectiveness of soil conservation strategies, Vienna: FAO/IAEA.42, 2014.

ISO, 11464:2006. Soil quality-Pretreatment of samples for physico-chemical analysis..

D. Walling, Y. Zhang and Q. He, Conversion models and related software. Guidelines for using fallout radionuclides to assess erosion and effectiveness of soil conservation strategies, Vienna: FAO/IAEA, 2014.

D.Zhibao, W. Xunming and L. Lianyou, "Wind erosion in arid and semiarid China: An overview". J. Soil Water Conserv. 55, 439–444. 2000.

F. Zapata, Handbook for the Assessment of Soil Erosion and Sedimentation Using Environmental Radionuclides, Vienna, Austria: Kluwer Academic Publishers, 2002. Available: https://doi.org/10.1007/0-306-48054-9

R. Lal, "Soil erosion by wind and water: problems and prospects." Soil erosion research methods. Routledge, 1-10. 2017. Available: https://doi.org/10.1201/9780203739358-1

Downloads

Published

2022-12-29

How to Cite

Ochirbat, B., Purevsuren, O., & Manaljav, S. (2022). Soil erosion study of the gobi desert region using the cesium-137 isotope method : (A case study of the Orog lake are). Mongolian Journal of Geography and Geoecology, 59(43), 74–83. https://doi.org/10.5564/mjgg.v59i43.2514

Issue

Section

Articles