Effect of biochar on phosphorus sorption and clay soil aggregate stability
Effect of biochar on phosphorus sorption and clay soil aggregate stability
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DOI：
10.1016/j.geoderma.2013.12.022
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发表时间：
2014-05
期刊：
影响因子：
6.1
通讯作者：
H. Soinne;J. Hovi;P. Tammeorg;E. Turtola
中科院分区：
文献类型：
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作者：
H. Soinne;J. Hovi;P. Tammeorg;E. Turtola
土壤结构是影响土壤生产力和农业土壤环境副作用的关键性质之一。表层土壤结构不良增加了土壤被水侵蚀的风险，被侵蚀的粘土大小的颗粒可以将吸附的磷(P)带到地表水，从而引起接收水道的富营养化。用于减少侵蚀的管理措施，如减少耕作，可导致磷在最上层土壤中富集，从而导致径流水中溶解磷损失的风险增加。在本研究中，我们旨在确定生物炭（BC）是否可以通过提高团聚体稳定性来减少粘土侵蚀。此外，我们还测试了添加BC是否会改变土壤对磷的吸附亲和力，并有助于减少溶解磷的损失。一种砂质土壤和两种粘土土壤分别添加BC(0、15和30 t ha - 1)，培养3周后，采用湿筛法测量胶体颗粒的释放和团聚体的稳定性。采用Q/I（数量/强度）样地法估算土壤表面对磷的吸收。本研究使用的BC对磷的吸附亲和力很低，添加BC并没有增加培养土壤对磷的吸附。然而，对于两种粘性土，BC的添加增加了团聚体的稳定性，减少了胶体物质的脱离。因此，BC诱导土壤性质的变化可能有利于控制侵蚀，从而有助于减少农田的颗粒磷损失。
Soil structure is one of the key properties affecting the productivity of soils and the environmental side effects of agricultural soils. Poor surface soil structure increases the risk of soil erosion by water and eroded clay-sized particles can carry adsorbed phosphorus (P) to the surface waters, thus inducing eutrophication of receiving waterways. Management practices, e.g. reduced tillage, used to reduce erosion can lead to enrichment of P in the uppermost soil layers, which leads to elevated risk for dissolved P loss in the runoff water. In this study, we aimed to identify whether biochar (BC) could be used to reduce clay soil erosion by improving aggregate stability. Moreover, we tested whether the BC addition would change the P sorption affinity of the soil and help to reduce the loss of dissolved P. One sandy and two clayey soils were amended with BC (0, 15 and 30 t ha− 1) and after a 3-week incubation, a wet-sieving method was used to measure the release of colloidal particles and the stability of aggregates. The sorption of P onto soil surfaces was estimated with a Q/I (quantity/intensity) plot technique. The BC used here had a very low P sorption affinity and the BC addition did not increase the sorption of P in incubated soils. However, for the two clayey soils, the BC additions increased aggregate stability and reduced detachment of colloidal material. The BC thus induced changes in soil properties that could be beneficial for erosion control and thereby aid in reducing particulate P losses from agricultural fields.