Progressive nitrogen limitation of ecosystem responses to rising atmospheric carbon dioxide
Progressive nitrogen limitation of ecosystem responses to rising atmospheric carbon dioxide
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DOI：
10.1641/0006-3568(2004)054
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发表时间：
2004-08-01
期刊：
影响因子：
10.1
通讯作者：
Field, CB
中科院分区：
文献类型：
--
作者：
Luo, Y;Su, B;Field, CB
土壤氮对陆地碳固存的调节作用是全球生态地球化学中一个极具争议的问题。这一争议转化为预测未来全球陆地固碳的巨大不确定性。提出了一个以渐进性氮限制（PNL）概念为核心的陆地生态系统碳氮相互作用研究框架。在PNL，有效的土壤氮变得越来越有限的C和N被隔离在长寿植物生物量和土壤有机质。我们的分析集中在PNL在调节生态系统对大气二氧化碳浓度上升的反应中的作用，但这一概念适用于最初导致C和N以有机形式积累的任何扰动。本文探讨条件下，PNL可能会或可能不会限制净初级生产力和固碳陆地生态系统。虽然PNL为中心的框架有可能解释不同的实验结果，并帮助研究人员整合模型和数据，直接测试的PNL假设仍然是一个巨大的挑战，研究界。
A highly controversial issue in global biogeochemistry is the regulation of terrestrial carbon (C) sequestration by soil nitrogen (N) availability. This controversy translates into great uncertainty in predicting future global terrestrial C sequestration. We propose a new framework that centers on the concept of progressive N limitation (PNL) for studying the interactions between C and N in terrestrial ecosystems. In PNL, available soil N becomes increasingly limiting as C and N are sequestered in long-lived plant biomass and soil organic matter. Our analysis focuses on the role of PNL in regulating ecosystem responses to rising atmospheric carbon dioxide concentration, but the concept applies to any perturbation that initially causes C and N to accumulate in organic forms. This article examines conditions under which PNL may or may not constrain net primary production and C sequestration in terrestrial ecosystems. While the PNL-centered framework has the potential to explain diverse experimental results and to help researchers integrate models and data, direct tests of the PNL hypothesis remain a great challenge to the research community.