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首页> 外文期刊>Soil Research >Clay and biochar amendments decreased inorganic but not dissolved organic nitrogen leaching in soil
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Clay and biochar amendments decreased inorganic but not dissolved organic nitrogen leaching in soil

机译：粘土和生物炭改良剂减少了土壤中无机氮的浸出但未溶解有机氮的浸出

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摘要

Nitrogen (N) leaching from coarse-textured soils frequently leads to productivity losses and negative environmental consequences. Historically, clay amendment has been used on coarse-textured soils to decrease water repellence and nutrient leaching. More recently, biochar has been proposed as an alternative soil amendment to decrease N leaching while simultaneously storing carbon. As biochar has a greater nutrient-retention capacity, we hypothesised that biochar derived from Eucalyptus marginata would be a more effective amendment than clay at minimising N leaching. The soil used was a coarse-textured agricultural sand with the following treatments: (7) biochar incorporated homogenously into the 0-10 cm soil layer, (2) clay incorporated similarly, (3) biochar added as a layer at 10 cm depth, (4) clay added similarly, or (5) a control. Amendments were added at 25 t/ha and watered periodically over 21 days and watered with the equivalent to 30 mm. Clay and biochar amendments significantly decreased cumulative NH_4~+ leaching by -20% and NO_3~ leaching by 25%. Biochar decreased NO_3 leaching significantly more than clay, possibly due to decreased nitrification. Dissolved organic N leaching was not influenced by any treatment. Leaching of N was unaffected by amendment application method. We conclude that to decrease N leaching, land managers should apply the most readily available of the amendments in the most convenient manner.
机译：从质地粗糙的土壤中浸出的氮通常会导致生产力下降和负面的环境后果。从历史上看，粘土改良剂已用于粗糙结构的土壤，以减少疏水性和养分浸出。最近，已经提出了生物炭作为替代性土壤改良剂，以减少氮的浸出同时存储碳。由于生物炭具有更大的养分能力，我们假设从桉树边缘提取的生物炭在减少氮淋失方面比粘土更有效。所使用的土壤是经过粗化处理的农业用沙，并经过以下处理：（7）将生物炭均匀地掺入0-10厘米的土壤层中;（2）类似地掺入粘土;（3）以10厘米深度添加一层生物炭; （4）类似添加的粘土，或（5）对照。添加量为25吨/公顷，并在21天内定期浇水，并浇水30毫米。粘土和生物炭改良剂显着降低了累积NH_4〜+淋洗的-20％和NO_3〜淋洗的25％。生物炭减少的NO_3浸出量明显高于粘土，这可能是由于硝化作用降低所致。溶解有机氮的浸出不受任何处理的影响。 N的浸出不受修正申请方法的影响。我们得出结论，为减少氮淋失，土地管理者应以最方便的方式应用最容易获得的修正案。

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