Wang Shutao, Feng Qian, Zhou Yapeng, Mao Xiaoxi, Chen Yaheng, Xu Hao
Land and Resources College, Hebei Agricultural University, Baoding, China.
Key Laboratory of Hebei Agricultural Environment, Baoding, China.
PLoS One. 2017 Nov 1;12(11):e0187536. doi: 10.1371/journal.pone.0187536. eCollection 2017.
Soil salinization is a global problem that limits agricultural development and impacts human life. This study aimed to understand the dynamic changes in water and salinity in saline-alkali soil based on an indoor soil column simulation. We studied the changes in the water and salt contents of soils with different degrees of salinization under various irrigation conditions. The results showed that after seven irrigations, the pH, conductivity and total soluble salt content of the percolation samples after irrigation generally increased initially then decreased with repeated irrigation. The soil moisture did not change significantly after irrigation. The pH, conductivity, and total soluble salt content of each layer of the soil profile exhibited general declining trends. In the soil profile from Changguo Township (CG), the pH decreased from 8.21-8.35 to 7.71-7.88, the conductivity decreased from 0.95-1.14 ms/cm to 0.45-0.68 ms/cm, and the total soluble salt content decreased from 2.63-2.81 g/kg to 2.28-2.51 g/kg. In the soil profile from Zhongjie Industrial Park (ZJ), the pH decreased from 8.36-8.54 to 7.73-7.96, the conductivity decreased from 1.58-1.68 ms/cm to 1.45-1.54 ms/cm, and the total soluble salt decreased from 2.81-4.03 g/kg to 2.56-3.28 g/kg. The transported salt ions were primarily K+, Na+ and Cl-. After several irrigations, a representative desalination effect was achieved. The results of this study can provide technical guidance for the comprehensive management of saline-alkali soils.
土壤盐渍化是一个限制农业发展并影响人类生活的全球性问题。本研究旨在基于室内土柱模拟了解盐碱土中水盐的动态变化。我们研究了不同盐渍化程度的土壤在各种灌溉条件下的水盐含量变化。结果表明，经过7次灌溉后，灌溉后渗滤样品的pH值、电导率和总可溶性盐含量一般先升高，然后随着重复灌溉而降低。灌溉后土壤湿度变化不显著。土壤剖面各层的pH值、电导率和总可溶性盐含量总体呈下降趋势。在长国乡（CG）的土壤剖面中，pH值从8.21 - 8.35降至7.71 - 7.88，电导率从0.95 - 1.14 ms/cm降至0.45 - 0.68 ms/cm，总可溶性盐含量从2.63 - 2.81 g/kg降至2.28 - 2.51 g/kg。在中街工业园区（ZJ）的土壤剖面中，pH值从8.36 - 8.54降至7.73 - 7.96，电导率从1.58 - 1.68 ms/cm降至1.45 - 1.54 ms/cm，总可溶性盐从2.81 - 4.03 g/kg降至2.56 - 3.28 g/kg。迁移的盐离子主要是K +、Na +和Cl -。经过几次灌溉后，实现了典型的脱盐效果。本研究结果可为盐碱土的综合治理提供技术指导。
