| Distribution characteristics of salt ions in soil aggregates with different particle diameters for two types of typical halosols in Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2021.05.28 |
| Key Words: typical halosols salt ions distribution characteristics soil aggregates |
| Author Name | Affiliation | | GUO Quanen | Soil Fertilizer and Water-Saving Institute, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | CAO Shiyu | Soil Fertilizer and Water-Saving Institute, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | ZHAN Zongbing | Soil Fertilizer and Water-Saving Institute, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | NAN Lili | Pruatacultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WANG Zhuo | Soil Fertilizer and Water-Saving Institute, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | ZHANG Jujun | Agricultural Science and Technique Service Center of Jingtai County, Jingtai, Gansu 730400, China | | ZHU Xiaotao | Agricultural Science and Technique Service Center of Jinta County, Jinta, Gansu 735300, China |
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| Abstract: |
| The distribution characteristics of salt ions in soil aggregates with different particle diameters significantly affect cycling, conversion, and availability of soil nutrients. In the study, with silty clay loam from Guazhou County and sand loam from Jinchang County of Gansu Province as the study objects. Based on the dry sieving method, aggregate diameters were divided into 6 grades: > 5 mm, 2~5 mm, 1~2 mm, 0.5~1 mm, 0.25~0.5 mm, and <0.25 mm to explore distribution characteristics of salt ions in soil aggregates with different particle diameters. The results showed that the distribution of salty ions in soil was related to the size of soil particles. Soluble total salt, HCO-3, Cl-, SO2-4, Ca2+， and Na+ in silty clay loam and sandy loam were mostly distributed in soil aggregates with the diameter of less than 0.25 mm, followed by in the size of 2~5 mm, and their distributions in soil aggregates with the diameter of more than 5 mm were the lowest. The percentages of soluble total salt, HCO-3, Cl-, SO2-4, Ca2+ and Na+ in silty clay loam and sandy loam were both the highest in soil particles with particle size less than 0.25 mm, and the percentages are 28.1% and 39.5%, 29.7% and 45.7%, 27.1% and 32.5%, 32.1% and 36.6%, 36.2% and 40.2%, 29.3% and 31.3%, respectively. These numbers were the lowest in soil particles with particle size more than 5 mm, and the percentages were 7.9% and 8.1%, 9.1% and 6.7%, 8.7% and 9.6%, 6.1% and 8.2%, 5.8% and 5.8%,7.5% and 8.8%, respectively. The distribution of Mg2+ was related to the type of soil texture and it was mostly distributed in soil particles with particle size in the 2~5 mm and more than 5 mm. The percentages of Mg2+ in silty clay loam was the highest in soil particles with particle size in the 2~5 mm, and it was 24.6%, and the lowest in soil particles with particle size more than 5 mm was 8.6%. But in sandy loam, the percentages of Mg2+ was the highest in soil particles with particle size more than 5 mm, and it was 32.4%, and the lowest in soil particles with particle size in the 0.5~1 mm was 4.8%. |
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