以松嫩平原盐碱区查干湖湿地土壤为试材,采用模拟冻融培养的方法,研究不同冻融温度、冻融循环次数对土壤水溶性有机碳(WSOC)含量变化及水溶性物质荧光特性的影响,以期揭示盐碱湿地土壤水溶性物质对冻融循环和冻融温度的响应,为评价土壤肥力、资源的合理利用和土壤环境的修复提供参考依据.结果表明:湿地0～20 cm 土层的土壤 WSOC含量高于20～40 cm 土层;冻融干扰对土壤水溶性有机碳含量有显著性影响;随着冻融循环次数的增加,土壤水溶性有机碳含量呈增加的趋势;冻融温度和冻融循环次数交互存在时影响土壤水溶性碳含量变化.不同冻融处理土壤 WSOC均由类腐殖质酸组成,-25～5 ℃冻融温度样品中含有的腐殖酸含量最高;冻融处理影响了 土壤水溶性物质的荧光强度,但并未影响土壤水溶性物质的结构变化.
Response of Water-soluble Substances in Saline-alkali Wetland
The soil of Chagan Lake wetland in the saline alkali area of Songnen Plain was used as the research material,and the simulation freeze-thaw culture method was used to study the effects of different freeze-thaw temperatures and freeze-thaw cycles on the changes in soil water-soluble organic carbon(WSOC)content and the fluorescence characteristics of water-soluble substances,in order to reveal the response of water-soluble substances in saline alkali wetland soil to freeze-thaw cycles and freeze-thaw temperatures,provide reference for evaluating soil fertility,rational utilization of resources and remediation of soil environment.The results showed that the soil WSOC content in the 0-20 cm soil layer of the wetland was higher than that in the 20-40 cm soil layer.Freezing and thawing interference had a significant impact on the content of water-soluble organic carbon in soil.As the number of freeze-thaw cycles increased,the content of water-soluble organic carbon in soil showed an increasing trend.The interaction between freeze-thaw temperature and the number of freeze-thaw cycles affected the variation of soil water-soluble carbon content.The soil WSOC of different freeze-thaw treatments was composed of humic acid like substances,with the highest content of humic acid found in samples at-25-5 ℃ freeze-thaw temperatures.The freeze-thaw treatment affected the fluorescence intensity of soil water-soluble substances,but did not affect the structural changes of soil water-soluble substances.
reed wetlandfreeze and melt interferencefluorescence spectrumwater-soluble organic car-bon
NETL
NSTL
万方数据
维普
