Representation of phosphorus cycle in Joint UK Land Environment Simulator (vn5.5_JULES-CNP)
Representation of phosphorus cycle in Joint UK Land Environment Simulator (vn5.5_JULES-CNP)
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DOI：
10.5194/gmd-2021-403
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发表时间：
2021-12
影响因子：
5.1
通讯作者：
M. Nakhavali;L. Mercado;I. Hartley;S. Sitch;Fernanda V. Cunha;Raffaello di Ponzio;L. F. Lugli;C. Quesada;K. Andersen;S. Chadburn;A. Wiltshire;D. Clark;G. Ribeiro;Lara Siebert;A. M. Moraes;Jéssica Schmeisk Rosa;R. Assis;J. Camargo
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作者：
M. Nakhavali;L. Mercado;I. Hartley;S. Sitch;Fernanda V. Cunha;Raffaello di Ponzio;L. F. Lugli;C. Quesada;K. Andersen;S. Chadburn;A. Wiltshire;D. Clark;G. Ribeiro;Lara Siebert;A. M. Moraes;Jéssica Schmeisk Rosa;R. Assis;J. Camargo
抽象的。大多数陆地表面模型 (LSM) 是地球系统模型 (ESM) 的陆地组成部分，包括对生态系统生产力的氮限制的表示。然而，这些模型中只有少数纳入了磷 (P) 循环。在热带生态系统中，这一点可能特别重要，因为氮往往很丰富，但岩石衍生元素（例如磷）的可用性可能非常低。因此，如果没有磷循环的表征，亚马逊等地区的热带森林对大气二氧化碳浓度上升的反应仍然高度不确定。在这项研究中，我们将磷动态及其与氮和碳（C）循环的相互作用引入英国联合土地环境模拟器（JULES）。新模型 (JULES-CNP) 包括植被和土壤库中磷库的表示，以及控制这些库之间通量的关键过程。我们在亚马逊养分施肥实验 (AFEX) 中评估了 JULES-CNP，这是一个低肥力地点，代表了约 60% 的亚马逊土壤。我们在环境二氧化碳和二氧化碳浓度升高的情况下应用该模型。该模型能够重现在环境二氧化碳下观察到的植物和土壤磷库和通量。我们估计 P 将在当前 CO2 排放水平下将净初级生产力 (NPP) 限制为 24%，在 CO2 浓度升高的情况下将限制净初级生产力 (NPP) 46%。在 CO2 浓度升高的情况下，CNP 模拟中的生物量相对于当代 CO2 增加了 10%，尽管与 CN 和仅 C 模拟相比低 5%。我们的结果强调了高磷限制的可能性，因此在土壤肥力低的亚马逊森林中二氧化碳施肥能力较低。
Abstract. Most Land Surface Models (LSMs), the land components of Earth system models (ESMs), include representation of N limitation on ecosystem productivity. However only few of these models have incorporated phosphorus (P) cycling. In tropical ecosystems, this is likely to be particularly important as N tends to be abundant but the availability of rock-derived elements, such as P, can be very low. Thus, without a representation of P cycling, tropical forest response in areas such as Amazonia to rising atmospheric CO2 conditions remains highly uncertain. In this study, we introduced P dynamics and its interactions with the N and carbon (C) cycles into the Joint UK Land Environment Simulator (JULES). The new model (JULES-CNP) includes the representation of P stocks in vegetation and soil pools, as well as key processes controlling fluxes between these pools. We evaluate JULES-CNP at the Amazon nutrient fertilization experiment (AFEX), a low fertility site, representative of about 60 % of Amazon soils. We apply the model under ambient CO2 and elevated CO2. The model is able to reproduce the observed plant and soil P pools and fluxes under ambient CO2. We estimate P to limit net primary productivity (NPP) by 24 % under current CO2 and by 46 % under elevated CO2. Under elevated CO2, biomass in simulations accounting for CNP increase by 10 % relative to at contemporary CO2, although it is 5 % lower compared with CN and C-only simulations. Our results highlight the potential for high P limitation and therefore lower CO2 fertilization capacity in the Amazon forest with low fertility soils.