不同土壤改良剂对松嫩平原盐碱土理化性质的影响

目的]探讨不同改良剂组合对盐碱土的改良效果。方法]利用正交和随机设计,通过田间试验,研究了石膏、粉煤灰及糠醛渣的组合对盐碱土改良作用及改良机理,并与单一改良剂的影响进行了比较。结果]石膏、粉煤灰与糠醛渣都能降低盐碱土的容重,提高土壤的渗透速度和总孔隙度,但石膏的效果没有粉煤灰和糠醛渣好,而两两结合及三者结合比单施石膏、粉煤灰或者糠醛渣的效果更显著;施石膏、粉煤灰与糠醛渣均能显著降低盐碱土的pH值,促进Na+的淋洗,降低HCO3-的含量,提高SO42-、Ca2+、Mg2+、K+的含量,改善盐碱土土壤性质。结论]石膏、粉煤灰与糠醛渣组合比单施石膏、粉煤灰与糠醛渣对盐碱土理化性质的改善效果更显著。

The Influence of Different Soil Amendments on Physico-chemical Properties of Saline-alkali Soil in Songnen Plain

Objective] The study was to explore the improvement effect of different soil amendments on physico-chemical properties of saline-alkali soil.Method] In the field experiments with orthogonal and random design the amendment effect and mechanism of different amendment combinations including gypsum,fly ash and furfural residues on saline-alkali soil were studied and their effects was compared with that of single amendment.Result] The gypsum,fly ash and furfural residues could all decrease the volume weight of saline-alkali soil and increase the osmosis speed and total porosity of soil,but the effect of gypsum was as good as that of fly ash and furfural residues and the effect of their two combination or three combination was more significant than that of single application of them.Applying gypsum,fly ash and furfural residues could all decrease the pH value of saline-alkali soil,improve leaching of Na ,reduce HCO3-content and increase SO42-,Ca2 and Mg2 contents in saline-alkali soil,thus improving the soil property of saline-alkali soil.Conclusion] The combination of gypsum,fly ash and furfural residues had more significant effect on improving the physical-chemical properties of the saline-alkali soil compared with the single application of gypsum,fly ash and furfural residues.