不同潜水埋深下浅层土壤的水盐分布特征

doi:10.16843/j.sswc.2017.02.006

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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.

Key words： diving water level soil moisture soil salinity absolute concentration of soil distribution characteristic Tamarix chinensis Lour

Received: 14 July 2016

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S273.4

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	LI Xiaoqian
	XIA Jiangbao
	ZHAO Ximei
	YANG Jihua

Cite this article:

LI Xiaoqian,XIA Jiangbao,ZHAO Ximei, et al. Water and salt distribution characteristics of shallow soil at different diving water levels[J]. SSWC, 2017, 15(2): 43-50.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2017.02.006 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2017/V15/I2/43

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