中文关键词微塑料秸秆有机碳矿化橘园土壤β-葡萄糖苷酶 英文关键词microplasticsstraworganic carbon mineralizationcitrus orchard soilβ-glucosidase activity

作者	单位	E-mail
张秀玲	华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070	781730609@qq.com
鄢紫薇	华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070
王峰	湖北省生态环境科学研究院, 武汉 430072
王玺	华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070
徐晗	华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070
胡荣桂	华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070
严昶	湖北省农业生态环境保护站, 武汉 430070
林杉	华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070	linshan@mail.hzau.edu.cn

中文摘要 为探究微塑料污染对土壤有机碳矿化的影响，采集湖北当阳橘园土壤，进行室内有机碳矿化培养，研究添加微塑料和秸秆条件下土壤有机碳矿化特征及酶活性变化.结果表明，秸秆和微塑料混施显著影响了土壤有机碳矿化，但仅添加微塑料对土壤有机碳矿化无显著影响.与单施秸秆相比，低量微塑料与秸秆混施处理（PP1+S）显著促进了有机碳矿化，有机碳累积矿化量增加了8.20%，而中高量微塑料与秸秆混施处理（PP2+S和PP3+S）显著降低了有机碳累积矿化量，其中，高量微塑料与秸秆混施对土壤有机碳矿化抑制最明显，降低了10.13%.添加微塑料显著降低了β-葡萄糖苷酶活性，高量微塑料添加对酶活性的抑制最显著，与对照相比，在第1、6和35 d分别降低了20.52%、43.93%和17.79%；但是，添加秸秆缓解了微塑料输入对土壤β-葡萄糖苷酶活性抑制作用.有机碳矿化速率与DOC、MBC含量和β-葡萄糖苷酶活性均呈显著正相关. 英文摘要 To investigate the effects of microplastics on soil organic carbon mineralization and the changes in soil enzyme activities, an incubation experiment was conducted whereby single applications of either microplastics or straw, and combined application of both, were added to Dangyang citrus orchard soil. The results showed that the combined application of straw and microplastics significantly affected organic carbon mineralization in the soil, but the single addition of microplastics had no significant effect. Compared with straw alone, the application of a small combined amount of microplastics and straw significantly increased soil organic carbon mineralization by 8.20%, while medium and high amounts of the combined application significantly inhibited soil organic carbon mineralization. The lowest amount of organic carbon mineralization occurred with the highest amount of combined microplastics and straw, 10.13% lower than with straw alone. The addition of microplastics significantly reduced the activity of β-glucosidase. In particular, a high amount of microplastics significantly decreased the activity of β-glucosidase, compared with the control, by 20.52%, 43.93%, and 17.79% on the day 1, 6, and 35, respectively. However, straw application alleviated the inhibition effect of microplastic application on soil β-glucosidase activity. The soil organic carbon mineralization rate was significantly positively correlated with DOC, MBC and β-glucosidase activity.

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