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Agrochemical leaching reduction in biochar‐amended tropical soils of Belize
European Journal of Soil Science ( IF 4.0 ) Pub Date : 2020-07-13 , DOI: 10.1111/ejss.13021
Gerardo O. Aldana 1 , Charles Hazlerigg 2 , Elisa Lopez-Capel 1 , David Werner 3
Affiliation  

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°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.

中文翻译:

伯利兹生物炭改良的热带土壤中农药的浸出减少

这项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浸出的影响。生物炭是由混合软木,稻壳和桔梗秸秆制成的,每种都在700°C时热解。根据OECD 106指南,在批处理研究中,分别用0、1、2.5和5%(w / w)的生物炭对壤土,沙质壤土壤土和粘土壤土的热带土壤进行修正,以确定阿特拉津,敌草隆,恩诺沙星,土霉素和四环素的吸收量。利用分批吸附研究的结果以及土壤剖面的变化进行了FOCUS地下水建模,以探讨在风险评估中生物炭改良剂对at去津浸出的影响。结果表明,经过生物炭改良的土壤中农用化学物质的吸附比未经生物炭改良的土壤要高。土壤有机质含量和生物炭改良剂促进了土壤中农用化学物质的吸附。当使用生物炭作为土壤改良剂时,FOCUS模型显示了阿特拉津地下水(PECgw)的预测环境浓度显着降低。但是,在生物炭的吸收能力和由于生物炭掺入导致的土壤水文学变化之间,存在一个折衷的选择。稻米生物炭对伯利兹热带土壤的改良是减少所选农用化学品浸出的有效方法,尽管应谨慎进行广泛实施,并要考虑到在我们的建模中确定的与生物炭的使用之间的权衡。当使用生物炭作为土壤改良剂时,FOCUS模型显示了阿特拉津地下水(PECgw)的预测环境浓度显着降低。但是,在生物炭的吸收能力和由于生物炭掺入导致的土壤水文学变化之间,存在一个折衷的选择。稻米生物炭对伯利兹热带土壤的改良是减少所选农用化学品浸出的有效方法,尽管应谨慎进行广泛实施,并要考虑到在我们的建模中确定的与生物炭的使用之间的权衡。当使用生物炭作为土壤改良剂时,FOCUS模型显示了阿特拉津地下水(PECgw)的预测环境浓度显着降低。但是,在生物炭的吸收能力和由于生物炭掺入导致的土壤水文学变化之间,存在一个折衷的选择。稻米生物炭对伯利兹热带土壤的改良是减少所选农用化学品浸出的有效方法,尽管应谨慎进行广泛实施,并要考虑到在我们的建模中确定的与生物炭的使用之间的权衡。在生物炭的吸收能力和由于生物炭掺入导致的土壤水文变化之间,需要进行权衡。稻米生物炭对伯利兹热带土壤的改良是减少所选农用化学品浸出的有效方法,尽管应谨慎进行广泛实施,并要考虑到在我们的建模中确定的与生物炭的使用之间的权衡。在生物炭的吸收能力和由于生物炭掺入导致的土壤水文变化之间,需要进行权衡。稻米生物炭对伯利兹热带土壤的改良是减少所选农用化学品浸出的有效方法,尽管应谨慎进行广泛实施,并要考虑到在我们的建模中确定的与生物炭的使用之间的权衡。
更新日期:2020-07-13
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