Synergistic soil response to nitrogen plus phosphorus fertilization in hardwood forests
Synergistic soil response to nitrogen plus phosphorus fertilization in hardwood forests
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DOI：
10.1007/s10533-013-9918-1
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发表时间：
2014-04-01
期刊：
影响因子：
4
通讯作者：
Yanai, Ruth D.
中科院分区：
文献类型：
--
作者：
Fisk, Melany C.;Ratliff, Tera J.;Yanai, Ruth D.
植物和微生物过程对有效养分的化学计量施加控制，可能影响森林生态系统对氮富集和改变资源可用性的其他扰动的反应。我们测试了一种营养素的过量是否会影响另一种营养素的可用池，以了解矿化和吸收过程中各种反馈的净结果。我们研究了氮和磷的有效性（埋离子交换树脂条测定）在第一年的北北方阔叶林与30公斤/公顷的N，10公斤/公顷的P，或N和P一起。单一养分施肥提高了添加养分的有效性，对其他养分的有效性没有可检测的影响。但施N+P比单施N能显著提高树脂有效氮含量。这种影响的N+P必须是减少生物吸收的N或增加矿化的N的结果，并表明，N损失森林干扰后，将加强的情况下，N和P的可用性增加。P与N相互作用，以提高N的可用性，无论通过何种机制，可以帮助解释观察到的N和P的共同限制在生态系统中，并呼吁注意需要仔细阐明机制的森林生产力的共同限制。
Plant and microbial processes exert control on the stoichiometry of available nutrients, potentially influencing forest ecosystem responses to nitrogen enrichment and other perturbations that alter resource availability. We tested whether an excess of one nutrient influenced the available pool of another, to learn the net outcome of various feedbacks on mineralization and uptake processes. We examined nitrogen and phosphorus availability (assayed with buried ion-exchange resin strips) in the first year of fertilizing northern hardwood forests with 30 kg/ha N, 10 kg/ha P, or N and P together. Fertilizing with a single nutrient raised the availability of the added nutrient and had no detectable effect on availability of the other nutrient. However, resin-available N was raised substantially more by adding N+P than it was by adding N alone. This effect of N+P must be the result of either reduced biotic uptake of N or increased mineralization of N, and suggests that N loss following forest disturbances will be enhanced in cases where the availability of both N and P are increased. That P interacts with N to enhance N availability, by whatever mechanism, could help explain observations of N and P co-limitation in ecosystems and calls attention to the need to carefully elucidate mechanisms underlying co-limitation of forest productivity.