Ecological ramifications of the direct foliar uptake of nitrogen
Ecological ramifications of the direct foliar uptake of nitrogen
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DOI：
10.1007/s00442-008-1188-6
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发表时间：
2009-02
期刊：
影响因子：
2.7
通讯作者：
J. Sparks
中科院分区：
文献类型：
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作者：
J. Sparks
近30年来，人们对各种活性态氮(N)的叶面吸收进行了鉴定和研究。然而，科学界直到最近才考虑到这种摄取途径在生态系统层面的影响。在这篇综述中，我介绍了我们目前对叶片吸收过程的理解，然后讨论了为什么这个向生态系统添加氮的途径应该与氮在土壤表面的大量沉积分开考虑。叶面直接吸收是植物代谢中氮的直接补充，与土壤沉积的氮相比，可能更容易影响植物生长。目前的生态系统过程模型没有在叶面和土壤进入途径之间划分活性氮，而且大多数模型可能没有充分代表氮沉积对生态系统碳封存的影响。我还概述了未来了解叶面吸收活性氮的生态后果的几个研究重点。
The foliar incorporation of various reactive forms of nitrogen (N) has been identified and studied for nearly 30 years. However, the ecosystem-level ramifications of this uptake pathway have only recently been considered by the scientific community. In this review, I present our current understanding of the foliar uptake process and then discuss why this pathway of N addition to ecosystems should be considered separately from the bulk deposition of N to the soil surface. Direct foliar uptake is a direct addition of N to plant metabolism and could potentially more readily influence plant growth compared to soil-deposited N. Current ecosystem process models do not partition reactive N between foliar and soil entry pathways and the influence of N deposition on ecosystem C sequestration is likely inadequately represented in most models. I also outline several research priorities for the future understanding of the ecological consequences of foliar uptake of reactive N.