Verifying the nitrification to immobilisation ratio (N/I) as a key determinant of potential nitrate loss in grassland and arable soils
Verifying the nitrification to immobilisation ratio (N/I) as a key determinant of potential nitrate loss in grassland and arable soils
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DOI：
10.1051/agro:2002060
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发表时间：
2002-11-01
期刊：
影响因子：
--
通讯作者：
Watson, CJ
中科院分区：
文献类型：
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作者：
Stockdale, EA;Hatch, DJ;Watson, CJ
铵的竞争途径，即硝化(N)和固定化(I)的微生物过程的相对优势，已被认为是控制土壤氮损失的主要因素。在本文中，我们汇集了来自耕地和草地土壤的四项研究的数据，以确定N/I比率是否与排水中测量或模拟的硝酸盐损失相关。单独地，总氮转化的测量并不能解释所有地点硝酸盐浸出的变化。然而，所有地点的硝态氮损失量与N/I有很好的相关性。争夺矿化氮（以N/I表示）的途径的相对重要性因管理而改变，这似乎是控制耕地和草地土壤氮损失的一个重要因素。
The relative dominance of the competing pathways for ammonium, namely, the microbial processes of nitrification (N) and immobilisation (I), has been suggested as a major factor in controlling nitrogen losses from soils. In this paper we bring together data from four studies in arable and grassland soils to establish whether the ratio N/I is correlated with measured or modelled nitrate loss in drainage water. Individually, measurements of gross nitrogen transformations did not explain the variation in nitrate leaching across all sites. However, amounts of nitrate lost by leaching were well correlated with N/I for all sites. The relative importance of the pathways competing for mineralised nitrogen ( expressed as N/I) was changed by management and this appears to be an important factor in controlling N loss in arable and grassland soils.