冬季结冰灌溉对苏打盐碱土水盐变化的影响

doi:10.13249/j.cnki.sgs.2012.010.1241

Abstract

Abstract:

：A field experiment was conducted to investigate the water and salt dynamic of saline-sodic soil with freezing water irrigation in winter in Songnen Plain of China, which is one of the largest saline-sodic areas in the world. The plots were designed as follows: freezing saline water irrigation with application of phosphogypsum (100%GR gypsum requirement) (A), freezing saline water irrigation with application of phosphogypsum (50%GR) (B), freezing fresh water irrigation (C), freezing saline water irrigation (D), no irrigation and no phosphogypsum as CK. A total of 180 mm water was applied to experimental plots in January of 2011. Results showed that melted ice water increased soil water content in topsoil layer. It has great significance for resisting drought in spring planting. With infiltration of melted ice water, the surface soil was significantly desalinized. Major ions including Na⁺、Cl^-、CO₃²^-、HCO₃^-were decreasing by melted ice water. Comparative analysis demonstrated that desalinized effect was better in freezing saline water irrigation than freezing fresh water irrigation, and desalinized effect was better in freezing saline water irrigation with application of phosphogypsum than freezing saline water irrigation, and with the increase of phosphogypsum, soil desalinized effect was higher. The results indicated that the approach of freezing saline water irrigation and phosphogypsum in winter may benefit to resist drought in spring planting and improve saline-sodic soil by use of local saline groundwater.

Key words: freezing water irrigation, saline-sodic soil, phosphogypsum, variation of soil water and salt, Songnen Plain

CLC Number:

S152.7

Fan YANG, Zhi-chun WANG, Ye XIAO. Effect of Freezing Water Irrigation on the Changes of Soil Water and Salt in Saline-Sodic Soil Area[J].SCIENTIA GEOGRAPHICA SINICA, 2012, 32(10): 1241-1246.

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Effect of Freezing Water Irrigation on the Changes of Soil Water and Salt in Saline-Sodic Soil Area

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