灌溉水鹽分組成對土壤水鹽遷移參數(shù)的影響
[Abstract]:Shortage of fresh water resources and salinization are the limiting factors of agricultural production in arid areas. To study the parameters of water salt migration is an important target of water salt regulation. Therefore, taking the soil samples from the orchard of Xingguozhen, Qinan County, Gansu Province as the research object, using the horizontal soil column infiltration method, the different salt solutions (sodium chloride, sodium chloride and magnesium chloride, sodium chloride and calcium chloride) were studied. The effects of sodium chloride and potassium chloride on the soil water diffusivity and the horizontal migration of salt ions under the condition of 3 g / L salinity. The results showed that the effect of irrigation water quality and moisture content of different salt composition on soil water diffusivity was very significant (P0.01). Under the condition that the salinity of irrigation water is 3 g / L, the potential capacity of sodium chloride solution to transfer water is the greatest. Adding a certain amount of double salt has a blocking effect on water conduction, and the blocking capacity is as follows: calcium chloride, potassium chloride, magnesium chloride. Irrigation water with different salt composition had significant effects on the horizontal migration of soil bicarbonate and sulfate (P0.05), and on the horizontal migration of salt, calcium and sodium ions (P0.01). The effect of infiltration distance on soil pH and the effect of salt composition of irrigation water on sodium-adsorption ratio were significant (P0.05). The salt composition of irrigation water has a significant effect on the initial values and terminations of the model parameters. The initial values and terminations of the parameters are: sodium chloride, magnesium chloride, sodium chloride, potassium chloride, sodium chloride and calcium chloride. Therefore, considering the use of brackish water and the improvement of salinized soil, adding a certain amount of calcium in brackish water irrigation can inhibit the water diffusion and reduce the soil salt content. Alternate irrigation from both ends of the plot can prevent desalination at one end and salt accumulation at the other. The results of this study are of great scientific significance to guide the utilization of brackish water in arid and semi-arid areas.
【作者單位】: 甘肅省農(nóng)業(yè)科學(xué)院土壤肥料與節(jié)水農(nóng)業(yè)研究所;農(nóng)業(yè)部甘肅耕地保育與農(nóng)業(yè)環(huán)境科學(xué)觀測實驗站;中國農(nóng)業(yè)大學(xué)資源與環(huán)境學(xué)院;甘肅農(nóng)業(yè)大學(xué)草業(yè)學(xué)院;
【基金】:國家自然科學(xué)基金項目(41363004) 甘肅省農(nóng)業(yè)科學(xué)院科技創(chuàng)新工程學(xué)科團隊(2015GAAS03)
【分類號】:S278
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