不同钝化剂对土壤有机碳转化的影响及作用机制研究进展OA北大核心CSTPCDMEDLINE
Research progress on the impact and mechanisms of different passivators on soil organic carbon transfor-mation
钝化剂可以使土壤重金属由活性态向稳定态转化,降低重金属的迁移和生物可利用性,实现重金属污染土壤的修复.有机碳是反映土壤质量和健康的重要指标,其转化过程对大气化学、全球碳循环起到决定性作用,受到利用方式、农艺措施和治理修复活动的影响.钝化剂的施用一方面会改变土壤结构、团聚体组成和pH、阳离子交换率(CEC)等理化性质,影响土壤有机碳的动态变化;另一方面可以调控土壤微生物群落结构、多样性,改变有机碳转化酶的活性,从而影响土壤有机碳的转化.上述影响受到钝化剂种类、施用量及施用时间等多方面因素的调控.本文论述了不同钝化剂施用条件下,土壤有机碳组分及其变化情况,并探讨了钝化剂对土壤有机碳转化影响的作用机制.未来应基于作用机制,开发兼具固碳增汇与重金属钝化功能的新型钝化剂,并揭示钝化剂施用后土壤有机碳周转及稳定性有机碳的时空分布规律.
Passivators can reduce the bioavailability and mobility of heavy metals by forming stable complexes or precipitates,and achieve the remediation of heavy metal-polluted soil.Organic carbon is an important parameter reflecting soil quality and health.Organic carbon transformation process plays a decisive role in atmospheric chemistry and global carbon cycling,and is affected by land use ways,agronomic measures,and restoration activities.On the one hand,the application of passivators will change soil physical and chemical properties,such as soil structure,aggregate composition,pH,CEC,which in turn will affect the structure and diversity of soil microbial communi-ties,the activities of organic carbon conversion enzymes,and the transformation of soil organic carbon.The above effects are regulated by various factors such as the type,application amount,and application time of passivators.We discussed the composition of soil organic carbon and its changes under different passivator application condi-tions,and explored the mechanism underlying the effect of passivators on soil organic carbon transformation.In the future,new types of passivator with both carbon sequestration and heavy metal passivation functions should be developed.The temporal and spatial distribution patterns of soil organic carbon turnover and stable organic carbon after the application of passivators should be examined.
高闻哲;李廷强
浙江大学环境与资源学院,污染环境修复与生态健康教育部重点实验室,杭州 310058
重金属钝化剂土壤有机碳碳转化
heavy metalpassivatorsoil organic carboncarbon transformation
《应用生态学报》 2024 (008)
2291-2300 / 10
本文由国家自然科学基金面上项目(42177008)资助.
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