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| Salt accumulation and ion composition changes in soil under solar greenhouses in Lanzhou Region |
| Received:January 13, 2016 |
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| KeyWord:solar greenhouse;salt accumulation;salt ion composition;planting age;Lanzhou |
| Author Name | Affiliation | | YANG Si-cun | Institute of Soil, Fertilizer and Water-saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | | HUO Lin | Institute of Soil, Fertilizer and Water-saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | | WANG Cheng-bao | Institute of Soil, Fertilizer and Water-saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | | JIANG Wan-li | Institute of Soil, Fertilizer and Water-saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China |
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| Abstract: |
| Soil salt accumulation is one of the most severe soil problems in greenhouse production. Here an investigation was conducted to evaluate the dynamic changes of salt accumulation and ion composition in soils under different land uses and planting years in solar greenhouse in Lanzhou region. Results showed that salt accumulation and ion composition in the soil were affected by regional soil parent materials, hydro-geological conditions, soil permeability, farmers' management practices, etc. When a conventional cropland was converted to solar greenhouse, soil salt content was increased by 17.56%~29.77% in 0~100 cm soil. Obvious salt accumulation occurred in topsoil(0~20 cm), with average salt content being increased by 40%. Salt content in the topsoil increased with increasing planting age. Ions NO3-,SO42-,Ca2+ and Na+ were the most accumulated ones in topsoil, with anion accumulation being significantly higher than that of cations. Moreover, the dominating anions in the topsoil shifted from HCO3- to NO3- and SO42-. However, the major composition of cations remained to be Ca2+, with significant increases in K+ and Na+. Salt accumulation and NO3-,SO42- and Na+ enrichment not only caused physiological toxicity to vegetables, but also influenced cropping system in solar greenhouses, such as disordered nutritional supply, declined vegetable quality, soil acidification and groundwater pollution, etc. |
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