论文部分内容阅读
以黄河三角洲柽柳群落和盐碱光板地土壤为研究对象,利用单宁酸进行培养,通过测定土壤浸提液中盐基离子含量、计算离子比并进行相关统计分析,探讨单宁酸对盐碱土盐基离子有效性的影响.结果表明,随着单宁酸浓度升高,不同盐度土壤浸提液中的K~+、Ca~(2+)、HCO3-以及高盐土壤中的Cl-和低盐土壤中的SO_4~(2-)逐渐升高,而Na~+、Mg~(2+)、低盐土壤中的Cl-和高盐土壤中的SO_4~(2-)先升高后降低;不同盐度土壤中Na~+/K~+、Na~+/Ca~(2+)、Ca~(2+)/K~+、Mg~(2+)/K~+、Cl-/HCO_3~-、SO_4~(2-)/HCO_3~-和低盐土壤中的Cl-/SO_4~(2-)随着土壤中单宁酸浓度升高而降低,但Na~+/Mg~(2+)、Ca~(2+)/Mg~(2+)和高盐土壤中的Cl-/SO_4~(2-)则逐渐升高;方差分析的结果显示,单宁酸浓度除对高盐土壤中的Na~+影响不显著之外,对其他盐基离子及其比值的影响均达到显著水平;相关分析的结果表明,SO_4~(2-)在低盐土壤中与K~+、Na~+、Mg~(2+)和HCO_3~-之间的相关性与高盐土壤相反,而其他离子之间的相关性在不同盐度土壤中一致.综上,单宁酸能够降低土壤颗粒对盐基离子的吸附,促进土壤脱盐,因此可利用单宁酸或将其作为辅助材料改良盐碱土,但应适当控制单宁酸的用量,以促进更多Na~+的脱除及防止过多Ca~(2+)和K~+的流失.
Taking the Tamarix chinensis community and the saline-alkali soil in the Yellow River Delta as the research object, the tannic acid was used for the culture. The content of salt ions in the soil extract was calculated, and the ion ratio was calculated and analyzed statistically. The results showed that with the increase of tannic acid concentration, the contents of K ~ +, Ca ~ (2 +) and HCO3- in soil extracts of different salinities and Cl- And SO_4 ~ (2-) in low salt soils increased gradually, but Na ~ +, Mg ~ (2+), Cl ~ in low salt soils and SO_4 ~ (2-) in high salt soils increased firstly And then decreased. The contents of Na ~ + / K ~ +, Na ~ + / Ca ~ (2 +), Ca ~ (2 +) / K ~ +, Mg ~ (2 +) / K ~ +, Cl - / HCO_3 ~ -, SO_4 ~ (2 -) / HCO_3 ~ - and Cl ~ / SO_4 ~ (2-) in low salt soil decreased with the increase of tannic acid concentration in soil, but Na ~ + / Mg Cl ~ / SO_4 ~ (2-) in ~ (2 +), Ca ~ (2 +) / Mg ~ (2+) and high salt soils increased gradually.Analysis of variance showed that the concentration of tannic acid The effect of SO_4 ~ (2-) on the contents of other ion-based ions and its ratio were all significant. The results of correlation analysis showed that SO_4 ~ (2-) +, Na ~ + The correlation between Mg 2+ and HCO 3 - is opposite to that of high-salinity soils, while the correlations of other ions are consistent in different salinity so that tannin can reduce the effect of soil particles on salinity Ion adsorption and promote soil desalination, so tannic acid can be used or as an auxiliary material to improve saline-alkali soil, but the amount of tannin should be properly controlled to promote more Na ~ + removal and prevent excessive Ca ~ (2+) and K ~ + loss.