Water and salt distribution characteristics of shallow soil at different diving water levels
LI Xiaoqian, XIA Jiangbao, ZHAO Ximei, YANG Jihua
1. Shandong Provincial Key Laboratory of Soil Erosion and Ecological Restoration, College of Forestry, Shandong Agricultural University, 271018, Tai'an, Shandong, China; 2. Shandong Provincial Key Laboratory of Eco-environmental Science for Yellow River Delta, Binzhou University, 256603, Binzhou, Shandong, China
Abstract：[Background] Water and salt distribution of shallow soil are the main affecting factors of seedling growth. Taking soil columns planted with Tamarix chinensis Lour.(3-year-old), a constructive species in the Yellow River Delta as the research object, we aimed at studying how the diving water level (DWL) affects the water and salt distribution. [Methods] The experiment was carried out as such, first, planting the T. chinensis Lour. to soil column in the greenhouse, configuring the salt water in which mineralization degree was 6 grams per liter with sea salt, then setting up 6 diving water levels of 0.3 m, 0.6 m, 0.9 m, 1.2 m, 1.5 m, and 1.8 m, and each level set 3 repeats. In the use of drying method and residue drying method, the relative water content (RWC), salt content and absolute concentration at soil depths of 0-10 cm and 10-20 cm in a simulated device with DWL of 0.3 m, 0.6 m, 0.9 m, 1.2 m, 1.5 m and 1.8 m were measured. [Results] The RWC in 10-20 cm was higher than that in 0-10 cm and decreased significantly with the DWL increased (0-20 cm), but the decreasing degree in 0-10 cm was much higher than that in 10-20 cm, the highest reduction of the RWC was at both 1.2 m and 1.5 m. The salt content (0-10 cm) increased at first and then decreased with the DWL increasing, reached peak at 1.2 m (1.38%) and increased by106.35% compared with that at 0.3 m. The salt content (10-20 cm) was complex with the DWL changing, it changed smoothly at 0.3-0.9 m and increased at 1.2 m then decreased at 1.5-1.8 m, reached maximum at 1.2 m (1.33%) and increased by 304.04% compared with 0.3 m. The absolute concentration (0-10 cm) exponentially increased with the DWL increasing and maximum at 1.2 m (17.12%).The absolute concentration (10-20 cm) increased at first and then decreased with the DWL increasing and was maximal at 1.2 m (10.10%). [Conclusions] The RWC was significantly negative with the DWL (P < 0.01) while significantly positive for the salt level (P < 0.05); the absolute concentration (0-10 cm) was significantly positive with the DWL (P < 0.01) but significantly negative with the DWL (P < 0.01), the absolute concentration (10-20 cm) was significantly positive with the salt level (P < 0.01). This study provides theoretical basis and technical reference for the prevention of soil salinization in the Yellow River Delta and the planting management of T. chinensis Lour.
李小倩1,2, 夏江宝2, 赵西梅1,2, 杨吉华1. 不同潜水埋深下浅层土壤的水盐分布特征[J]. 中国水土保持科学, 2017, 15(2): 43-50.
LI Xiaoqian, XIA Jiangbao, ZHAO Ximei, YANG Jihua. Water and salt distribution characteristics of shallow soil at different diving water levels. SSWC, 2017, 15(2): 43-50.
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2017, Vol. 15 
