Impact of microbial activity on the leaching of soluble N forms in soil
Impact of microbial activity on the leaching of soluble N forms in soil
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DOI：
10.1007/s00374-017-1250-9
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发表时间：
2017
影响因子：
6.5
通讯作者：
A. Carswell;P. Hill;D. Jones;M. Blackwell;P. Johnes;E. Dixon;D. Chadwick
中科院分区：
文献类型：
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作者：
A. Carswell;P. Hill;D. Jones;M. Blackwell;P. Johnes;E. Dixon;D. Chadwick
低分子量有机氮（LMWON）化合物的水文输运在文献中很少受到关注，特别是相对于无机氮（N），较少关注降雨事件后碳（C）和氮循环的解耦。在模拟降雨条件下，利用15 N和13 C示踪15 N13 C-尿素、15 N13 C-氨基酸、15 NO3和15 NH 4在土壤剖面中的垂直迁移，研究了土壤生物区系对氮化合物在壤土中迁移的影响。这项研究表明，生物同化作用导致淋溶过程中C和N循环的快速分离，C的迁移仅限于土壤表面（< 2 cm），而在一次降雨过程中储存在土壤剖面中的N可以在另一次降雨过程中重新流动和淋溶（进一步2-6 cm）。
The hydrological transport of low-molecular weight organic nitrogen (LMWON) compounds has received little attention in the literature, particularly relative to inorganic nitrogen (N), with less attention given to the decoupling of the carbon (C) and N cycles following rainfall events. We determined the impacts of the soil biota on the transport of N compounds in a loam soil, using15N and13C to trace the vertical transport of15N13C-urea,15N13C-amino acids,15NO3, and15NH4through the soil profile, following simulated rainfall events. This research has demonstrated that biotic assimilation leads to rapid decoupling of the C and N cycles during leaching, with C transport limited to the soil surface (< 2 cm), whereas N which was stored within the soil profile during a single rainfall event could be remobilised and leached (a further 2–6 cm) following an additional rainfall event.