Dynamics of Soil Moisture and Salt Content After Infiltration of Saline Ice Meltwater in Saline-Sodic Soil Columns  

作　　者：XIAO Ye HUANG Zhigang YANG Fan WANG Zhichun ZHOU Xia LIU Zhijun 

机构地区：[1]Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changehun 130102(China) [2]Hunan University of Arts and Science,Changde 415000(China) [3]Department of Agricultural and Resource Economics,the University of Tennessee,Knoxville TN 37996(USA) [4]Dynamic Solutions,LLC,Knoxville TN 37996(USA)

出　　处：《Pedosphere》2017年第6期1116-1124,共9页土壤圈（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2016YFC0501200);the National Natural Science Foundation of China(Nos.41571210 and 41601583);the Natural Science and Technology Basic Work of China(No.2015FY110500)

摘　　要：Saline ice meltwater can be used for irrigation and leaching of salts in salt-affected soil regions.A laboratory experiment was conducted using soil columns to investigate the redistribution of soil moisture, salt and sodium adsorption ratio(SAR) in saline-sodic soil under the infiltration of saline ice meltwater.Soils were treated using saline water of three irrigation volumes(1 600, 2 400 and 3 200 mL) at four salinity levels.These four salinity levels included salt free(0 g L^(-1)), low salinity level(1.4 g L^(-1)), moderate salinity level(2.7 g L^(-1)) and high salinity level(4.1 g L^(-1)).The prepared saline water was frozen into ice, and then the ice was put on the surface of soil columns.After 96 h, the infiltration rate and soil moisture content of saline ice treatments were greater than those of salt-free ice treatments, increasing with the increase of ice salinity.Infiltration of saline ice meltwater increased soil moisture content in the upper layers for all treatments.Both salt contents and SAR values in the upper soil layers decreased in all saline ice treatments and were lower than those in salt-free ice treatment.However, this trend was reversed in the deeper(below 20 cm) soil layers.The highest desalting rate and lowest SAR were observed in high-salinity treatment under three irrigation volumes in the 0–15 cm soil layer,especially under irrigation volume of 2 400 mL.These results indicate that saline ice(0–20 cm) meltwater irrigation is beneficial to saline-sodic soil reclamation, and the best improvement effect would be achieved when using high-salinity ice under optimal irrigation volume.Saline ice meltwater can be used for irrigation and leaching of salts in salt-affected soil regions.A laboratory experiment was conducted using soil columns to investigate the redistribution of soil moisture, salt and sodium adsorption ratio（SAR） in saline-sodic soil under the infiltration of saline ice meltwater.Soils were treated using saline water of three irrigation volumes（1 600, 2 400 and 3 200 mL） at four salinity levels.These four salinity levels included salt free（0 g L^（-1））, low salinity level（1.4 g L^（-1））, moderate salinity level（2.7 g L^（-1）） and high salinity level（4.1 g L^（-1））.The prepared saline water was frozen into ice, and then the ice was put on the surface of soil columns.After 96 h, the infiltration rate and soil moisture content of saline ice treatments were greater than those of salt-free ice treatments, increasing with the increase of ice salinity.Infiltration of saline ice meltwater increased soil moisture content in the upper layers for all treatments.Both salt contents and SAR values in the upper soil layers decreased in all saline ice treatments and were lower than those in salt-free ice treatment.However, this trend was reversed in the deeper（below 20 cm） soil layers.The highest desalting rate and lowest SAR were observed in high-salinity treatment under three irrigation volumes in the 0–15 cm soil layer,especially under irrigation volume of 2 400 mL.These results indicate that saline ice（0–20 cm） meltwater irrigation is beneficial to saline-sodic soil reclamation, and the best improvement effect would be achieved when using high-salinity ice under optimal irrigation volume.

关 键 词：DESALTING irrigation SALINITY sodium adsorption ratio soil reclamation 

分 类 号：S156.4[农业科学—土壤学]