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首页> 外文期刊>Agriculture, Ecosystems & Environment: An International Journal for Scientific Research on the Relationship of Agriculture and Food Production to the Biosphere >Soil tillage to reduce surface metal contamination - model development and simulations of zinc and copper concentration profiles in a pig slurry-amended soil
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Soil tillage to reduce surface metal contamination - model development and simulations of zinc and copper concentration profiles in a pig slurry-amended soil

机译：土壤耕作以减少表面金属污染-猪粪改良土壤中锌和铜浓度分布的模型开发和模拟

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Long-term applications of organic amendments, such as pig slurry (PS), may represent environmental risk of soil and water pollution by trace metals (TM). Our objective was to examine different soil and manure management scenarios that enhance the long-term agricultural use of soils under repetitive PS applications while avoiding environmental risk. Firstly, we developed a new module for simulating the impacts of soil tillage frequencies in Hydrus-1D. Secondly, we used a previously validated modeling approach to predict the surface accumulation and movement of the TM during the next 100-year in the soil under different PS doses (80 and 40 m(3) ha(-1) cultivation(-1)) and tillage frequencies (no-tillage and 20, 10, and 5-year tillage). No-tillage simulations revealed consistent TM surface accumulations, reaching the soil threshold value for Cu in the 0-20 cm layer after 86 years of PS amendments at high doses, but in layers 0-5, 0-10, and 5-10 cm, this concentration was already reached after 17, 38, and 75 years, respectively. While soil tillage reduced TM concentrations over the top 20 cm of the soil profile, it increased their transfer to deeper layers. Periodical soil tillage each 5, 10, and 20 years was found to allow PS applications without reaching the Cu threshold value in soil during 100 years. However, soil solution concentrations of Zn reached the threshold values for groundwater. Therefore, the best manure management practice for the long-term PS disposal with respect to Zn and Cu concentrations in soil is the application of moderate PS rates
机译：长期使用有机改良剂（例如猪粪浆（PS））可能代表痕量金属（TM）污染土壤和水的环境风险。我们的目标是研究不同的土壤和肥料管理方案，这些方案可以在重复PS施用下增加土壤的长期农业利用，同时避免环境风险。首先，我们开发了一个新模块，用于模拟Hydrus-1D中耕作频率的影响。其次，我们使用先前验证过的建模方法来预测在不同PS剂量（80和40 m（3）ha（-1）耕种（-1）下土壤在未来100年内TM的表面积累和运动）和耕种频率（免耕和20、10和5年耕种）。免耕模拟显示一致的TM表面累积，在高剂量的PS改良86年后，0-20 cm层中Cu达到土壤阈值，但0-5、0-10和5-10 cm层中Cu达到土壤阈值，分别在17、38和75年后就达到了这一浓度。尽管土壤耕作降低了土壤剖面顶部20 cm的TM浓度，但增加了它们向更深层的转移。发现每隔5年，10年和20年进行定期土壤耕作可允许PS应用，而100年内未达到土壤中的Cu阈值。但是，土壤溶液中锌的浓度达到了地下水的阈值。因此，针对土壤中锌和铜的浓度进行长期PS处理的最佳粪便管理实践是采用中等PS速率

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