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Arid Land Geography ›› 2022, Vol. 45 ›› Issue (1): 219-225.doi: 10.12118/j.issn.1000–6060.2021.123

• Biology and Pedology • Previous Articles     Next Articles

Soil particle size composition characteristics of Pinus sylvestris plantations in Nur-Sultan City

LOU Boyuan1,2,3(),WANG Yongdong1,2(),ZHOU Na1,2,YAN Jinsheng1,2,3,Akida ASKAR1,2,3   

  1. 1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China
    2. National Engineering Technology Research Center for Desert-Oasis Ecological Construction, Urumqi 830011, Xinjiang, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2021-03-11 Revised:2021-09-09 Online:2022-01-25 Published:2022-01-21
  • Contact: Yongdong WANG E-mail:louboyuan18@mails.ucas.ac.cn;wangyd@ms.xjb.ac.cn

Abstract:

Nur-Sultan City is located in northern Kazakhstan, and the local government has planted a large area of plantation forests on the desert steppe around the city. Soil particle size composition is one of the basic physical properties of soil, which affects the changes of soil nutrients and moisture. To explore the effects of different forest ages of Pinus sylvestris plantations on soil particle size composition, this study analyzed the characteristics of soil particle size and fractal dimension of plantations around Nur-Sultan City through field sampling and indoor analysis, and examined the relationship between fractal dimension and soil characteristics. Results showed the following: (1) The soil particle size composition in the study area was dominated by silt, followed by sand, and clay was the least. The planting of a P. sylvestris plantation could significantly improve the content of fine particles in the soil surface. The deep soil particle content of different forest age plantation was not significant. The effect of planting P. sylvestris plantation on soil particle size is mainly observed in the surface area. (2) The variation of soil fractal dimension was between 2.059 and 2.569. During the growth of plantation, the fractal dimension increased first and then decreased, and reached the maximum on the 15th planting year. Soil fractal dimension was positively correlated with clay and silt, and 20 μm was the critical particle size that reflected the fractal dimension of plantation soil in the study area. (3) The soil fractal dimension in the study area was significantly positively correlated with soil organic matter and total nitrogen content, and the soil fractal dimension could be used to evaluate the soil nutrient status. The results can provide a theoretical basis for plantation construction and ecological restoration in Nur-Sultan City.

Key words: soil, particle composition, fractal dimension, physical and chemical properties, protection forest, Nur-Sultan City