不同改良工艺对吹填土土壤理化性质的影响

Effects of Different Reclamation Techniques on Soil Physical and Chemical Properties of Coastal Dredger Fill

通过原土改良与客土改良田间对比试验,研究不同改良工艺对吹填土土壤理化性质的影响。结果表明,与原始吹填土相比较,原土改良与客土改良均可不同程度地降低土壤含盐量,同时可有效改善土壤养分和物理结构,但均存在不同程度的脱盐碱化现象,说明土壤改良剂亦需进一步优化;与客土改良相比,原土改良60~80 cm土壤含盐量显著降低了84.47%,其他土层差异均不显著;原土改良0~20 cm土壤全氮、有机质、水解氮和有效磷含量分别显著提高了130.98%,23.71%,81.82%,321.02%,容重显著降低了14.09%,非毛管孔隙度和渗透率分别显著提高了5.08个百分点和4.72倍,说明原土改良效果显著优于客土改良。

The experiment was conducted to explore the effects of different reclamation techniques on soil physical and chemical properties of coastal dredger fill through the field comparison test of the original soil improvement and the treatment of soil replacement.The results showed that, compared with the coastal dredger fill, soil salinity could be decreased, and soil nutrient and physical structure could be effectively improved by the original soil improvement and the treatment of soil replacement, however, both the two soil improvement methods had a trend of salt-leaching alkalization in, meaning that soil conditioner also need to be further optimized.Compared with the treatment of soil replacement, the soil salinity was significantly decreased by 84.47% on the 60~80 cm soil in the original soil improvement, while the difference of the other soil layers was not significant; the contents of total nitrogen, organic matter,hydrolyzed nitrogen and available phosphorus in soil（0~20 cm） increased by 130.98%, 23.71%, 81.82% and 321.02% respectively,the bulk density decreased by 14.09%, and the porosity and permeability of non-capillary increased by 105.61% and 4.72 times, respectively. In conclusion, the original soil improvement was better than the treatment of soil replacement.