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| Physical and nutrient characteristics of sand soil improved by Pisha sandstone via field experiment |
| WANG Weiwei1,2, ZHANG Lixin1,2, LIANG Zhishui3, ZHAO Yanbing3, ZHANG Jishu1,2, WANG Zhong1,2, YUAN Qin1,2, YE Lina1,2 |
1. Elion Resource Group, 017400, Ordos, Inner Mongolia, China;
2. Inner Mongolia Kubuqi Desert Technology Research Institute, 017400, Ordos, Inner Mongolia, China;
3. School of Civil Engineering, Southeast University, 211189, Nanjing, China |
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Abstract [Background] Pisha sandstone is a kind of interbedding generated in Mesozoic rock that is mainly distributed in Shanxi, Shaanxi and Inner Mongolia. Due to its special properties of collapsing easily encountering water, it is eroded seriously. Additionally, Aeolian sandy soil and Pisha sandstone are complementary in structure, and the both can be transformed into useful composite soil and be effectively utilized for planting through effective combination. However, the related research on improvement of soil structure and nutrients is mainly carried out in laboratory conditions and the systematic research of field test is rare, especially in the Kubuqi Desert.[Methods] The research was conducted by the field test method (each is 6 667 m2) to study the improving effect by adding different proportions of Pisha sandstone on the physical structure and nutrient characteristics of the Aeolian sand soil from the hinterland of Kubuqi Desert in the northwest of Ordos Plateau. In the experimental test field, the different volume ratios (0%, 30%, 50%, 80% and 100%) of Pisha sandstone were added and mixed evenly. Additionally, the Haloxylon ammodendron and Glycyrrhiza uralensis were inter-planted. One month later, the evaluation indexes include mainly soil capillary porosity, field water holding capacity, organic matter, available nitrogen and available phosphorus were tested.[Results] With the increase of the adding proportion of Pisha sandstone, the contents of clay, silt, capillary porosity, field water-holding capacity, soil aggregate, organic matter, available nitrogen and available phosphorus increase gradually and the sandy soil is improved significantly. Under the condition of the same proportion of Pisha sandstone, with the increasing soil depth (0-30 cm) of the improved soil, the contents of clay, silt, soil organic matter, available nitrogen and available phosphorus decrease, but the vertical variation characteristics of soil bulk density, capillary porosity and field water-holding capacity are small. And the variation is smaller with the increase of mixing proportion, showing the phenomenon of obvious surface aggregation. According to multiple indexes, the mixing ratio of 50% has the best improvement effect, which can be used as the boundary value for improving the Aeolian sand soil. Additionally, the structure of soil particle and aggregate is positively correlated with soil capillary porosity, field water-holding capacity, organic matter, available nitrogen and available phosphorus content, which shows that the particle size of Pisha sandstone and Aeolian sand soil is complementary.[Conculsions] This is the first time to study the composite soil by the field test in Kubuqi Desert. The physical and nutrient characteristics of sand soil are improved by Pisha sandstone. It can provide a reference for the large-scale popularization and application of Pisha sandstone to improve the Aeolian sandy soil in Kubuqi Desert and promote the desertification control.
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Received: 26 July 2020
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