海泡石对镉污染土壤团聚体稳定性和有机碳含量的影响

发布时间：2018-02-02 03:54

本文关键词： 海泡石土壤团聚体有机碳稳定性　出处：《水土保持学报》2017年06期 　论文类型：期刊论文

【摘要】：通过大田试验,研究了在镉污染菜地原位钝化修复过程中海泡石对土壤团聚体组成和稳定性以及有机碳含量影响。结果表明,与对照相比,施用海泡石后整体上减少了5~8mm和0.25mm级别团聚体的数量,而2~5,1~2,0.5~1,0.25~0.5mm级别团聚体数量则不同程度增加,且随着海泡石施用量增加,其数量呈显著增加(P0.05)。在0—15cm土层中,土壤团聚体的平均质量直径(MWD)和几何平均直径(GMD)随海泡石施加浓度增加呈现先增加后降低,而在15—20cm土层中则有所降低。施用低浓度海泡石(0.5%)时,土壤有机碳(SOC)含量有所减少,最大降低了21.1%,而当海泡石添加剂量达到1%(H_1)和1.5%(H_(1.5))后,土壤有机碳含量整体上有所提高,较对照相比,最大增幅分别达到2.9%和70.3%。与对照相比,施用海泡石后增加了大团聚体中土壤有机碳的贡献率。
[Abstract]:The effects of sepiolite on the composition, stability and organic carbon content of soil aggregates in the process of in situ passivation and remediation of cadmium contaminated vegetable fields were studied by field experiments. After application of sepiolite, the total number of agglomerates of 5mm and 0.25mm was reduced, while the amount of 2kW 5mm and 0.25mm was decreased, and the amount of the aggregates was decreased by 0.5mm and 0.25mm, respectively. The number of 0.25mm-grade aggregates increased in varying degrees, and with the application of sepiolite, the number of aggregates increased significantly in the 0-15cm soil layer. The mean mass diameters (MWD) and geometric mean diameters (GMDs) of soil aggregates increased first and then decreased with the increase of sepiolite concentration. The soil organic carbon (SOC) content decreased to 21.1% when low concentration sepiolite was applied in the soil layer of 15-20 cm. However, when the amount of sepiolite additive reached 1 / h / 1) and 1.5 / kg / kg), the soil organic carbon content increased as a whole, compared with the control. The maximum increases were 2.9% and 70.3, respectively. Compared with the control, the contribution rate of soil organic carbon in the large aggregate was increased after the application of sepiolite.
【作者单位】：东北农业大学资源与环境学院;农业部环境保护科研监测所农业部产地环境污染防控重点实验室;农业部环境保护科研监测所天津市农业环境与农产品安全重点实验室;
【基金】：公益性行业(农业)科研专项(201203045) 天津市自然科学基金重点项目(17JCZDJC34200) 中国农科院基本科研业务费专项院级统筹项目
【分类号】：S152.4;S153.6;X53
【正文快照】： 土壤团聚体是土壤结构的基本单元,是评价土壤肥力和质量的主要指标,可以有效保障和协调土壤中的水肥气热、影响土壤酶的种类和活性以及维持和稳定土壤结构[1-3]。团聚体的大小、组成、稳定性等特征影响着土壤的持水性[4]、通透性[5]和抗蚀性[4,6]。土壤有机碳的数量和质量与团

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