| Effects of a soil ameliorant on the desalting of soda\|salinized meadow soil under flooding condition |
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| DOI：10.7606/j.issn81000-7601.2020.03.26 |
| Key Words: soil ameliorant desalination soda\|salined meadow soil flooding condition leaching |
| Author Name | Affiliation | | ZHANG Mingcong | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China
Research Center of Saline and Alkali Land Improvement Engineering Technology in Heilongjiang Province, Daqing, Heilongjiang 163319, China | | ZHOU Wei | Daqing Qilong Agricultural Science and Technology Limited Company, Daqing, Heilongjiang 163000, China | | SHI Liwen | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | WANG Chenghao | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | DU Jidao | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China
Research Center of Saline and Alkali Land Improvement Engineering Technology in Heilongjiang Province, Daqing, Heilongjiang 163319, China | | WU Yaokun | Daqing Branch of Heilongjiang Academy of Agricultural Sciences, Daqing, Heilongjiang 163316, China | | ZHANG Yuxian | College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang 163319, China |
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| Abstract: |
| Understanding the relationship between the soil ameliorants and soda\|salinized meadow soil was crucial for improving its effect on different depths of soil layers. The study investigated the effects of the soil ameliorants on desalting soda\|salinized meadow soil under flooding condition, we conducted a simulated leaching soil column experiment in laboratory, six ameliorants application rates, 0.00, 0.01, 0.05, 0.10, 0.50, and 1.00 g to each soil column(cross\|sectional area 0.0113 m2), equivalent to the 0.0, 8.9, 44.3, 88.5, 442.5,and 885.1 kg·hm-2, defined as S0, S1, S2, S3, S4, and S5, respectively. Our results indicated that under flooding condition, compared to S0, the application of soil ameliorants treatments (S3, S4, and S5) substantially reduced soil bulk density and soil pH on different depths of soil layers (0~30 cm) by 3.88% to 8.87% and 2.36% to 8.05%, respectively, and substantially increased soil porosity by 3.82% to 9.38% (P<0.05) on different depth soil layer (0~30 cm). The application of soil ameliorants treatments(S2, S3, S4, and S5) enhanced soil moisture infiltration of 20~40 cm soil layer, with an increase of 55.9% to 294.6% (P<0.05). The application of soil ameliorant reduced exchangeable sodium content with 0~10 cm and 10~20 cm soil layer (P<0.05), decreased by 4.84% to 56.5% (P<0.05), increased exchangeable sodium content of 20~30 cm and 30~40 cm soil layer by 1.09%~17.1%; S3, S4, and S5 reduced electrical conductivity of 0~10 cm soil layer by 49.0% to 60.4% (P<0.05), increased electrical conductivity of 20~40 cm soil layer by 3.68% to 19.8% (P<0.05); S2, S3, S4, and S5 reduced CO2-3 content of 10~20 cm soil layer by 5.98% to 23.4% (P<0.05); S3, S4, and S5 reduced HCO-3 content of 0~30 cm soil layer by 1.49%~18.0%; S2, S3, S4, and S5 substantially enhanced water stable aggregate ≥0.25 mm, with an increase of 16.4% to 161.7% (P<0.05); S3, S4, and S5 substantially increased mean weight diameter (MDW) by 5.78% to 161.7% (P<0.05). Based on comprehensive analysis of the effect of soil ameliorants on desalting soda\|salinized meadow soil and the application rates of soil ameliorants, the optimum application rate for the specific soil salinization in this experiment was proposed as 0.1g (88.5 kg·hm-2)with each soil column. |
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