Agrochemical leaching reduction in biochar-amended tropical soils of Belize
Agrochemical leaching reduction in biochar-amended tropical soils of Belize
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DOI：
10.1111/ejss.13021
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发表时间：
2020-08-04
影响因子：
4.2
通讯作者：
Werner, David
中科院分区：
文献类型：
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作者：
Aldana, Gerardo O.;Hazlerigg, Charles;Werner, David
本研究的目的是确定添加生物炭对伯利兹热带土壤中农用化学品淋溶的影响。生物炭由混合软木、稻壳和芒草秸秆制成，每种都在700 ℃热解。壤土，桑迪粉壤土和粘壤土的热带土壤进行了修订与0，1，2.5和5%（w/w）的生物炭，以确定阿特拉津，敌草隆，enroquinacine，土霉素和四环素吸收的批处理研究后，经合组织106指南。FOCUS地下水模型进行了批量吸附研究和改变土壤剖面的结果，以探讨在风险评估的背景下，生物炭修正阿特拉津的浸出效果。结果表明，施用生物炭的土壤对农药的吸附量高于未施用生物炭的土壤。土壤有机质含量和生物质炭的添加促进了农用化学品在土壤中的吸附。FOCUS模型显示，当将生物炭用作土壤改良剂时，地下水中阿特拉津的预测环境浓度（PECgw）显着降低。然而，一个权衡之间的吸附能力的生物炭和土壤中的水文变化作为一个结果的生物炭掺入确定。修正案的伯利兹热带土壤与稻壳生物炭被证明是一种有效的方法，以减少选定的农用化学品的浸出，虽然广泛的实施应仔细进行，考虑到潜在的权衡与生物炭的使用，在我们的建模。生物炭改良土壤是一种可行的方法，以增加吸附和减少农业化学品淋溶到地下水。环境归趋模型表明，1%和2.5%的生物炭添加量可以减少阿特拉津在土壤中的淋溶。模型确定了生物炭性能的权衡：改变土壤水文可能导致更大的沥滤。生物炭的实施必须考虑到确定的权衡，以确保在每种情况下的缓解工作。
The aim of this study was to determine the effects of biochar addition on agrochemical leaching in tropical soils of Belize. Biochars were produced from mixed softwood, rice husk and miscanthus straw, each pyrolysed at 700 degrees C. Loam, sandy silt loam and clay loam tropical soils were amended with 0, 1, 2.5 and 5% (w/w) biochar to determine atrazine, diuron, enrofloxacine, oxytetracycline and tetracycline absorption in batch studies following OECD 106 guidelines. FOCUS groundwater modelling was performed with the results of the batch-sorption study and alterations to the soil profiles to explore the effect of biochar amendment on the leaching of atrazine in a risk assessment context. Results showed that agrochemical sorption was higher in biochar-amended soils than soils without biochar amendment. Soil organic matter content and biochar amendment contributed to the agrochemical sorption increase in soils. The FOCUS modelling showed a significant reduction in predicted environmental concentration in groundwater (PECgw) of atrazine when biochar was applied as a soil amendment. However, a trade-off was identified between the sorptive capacity of the biochar and the changes in hydrology in the soil as a result of the biochar incorporation. The amendment of Belizean tropical soils with rice husk biochar was shown to be an effective method to reduce the leaching of the selected agrochemicals, although widespread implementation should be conducted carefully, taking account of the potential trade-offs with biochar use identified in our modelling. HighlightsBiochar-amended soil is a feasible method to increase sorption and reduce agrochemical leaching to groundwater. Environmental fate modelling demonstrated that 1% and 2.5% biochar amendment could reduce atrazine leaching in soil. Modelling identified a biochar performance trade-off: altered soil hydrology could lead to greater leaching. Biochar implementation must account for trade-offs identified to ensure the mitigation works in each circumstance.