Direct evidence for phosphorus limitation on Amazon forest productivity

IF 50.5 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Nature Pub Date : 2022-08-10 DOI:10.1038/s41586-022-05085-2
Hellen Fernanda Viana Cunha, Kelly M. Andersen, Laynara Figueiredo Lugli, Flavia Delgado Santana, Izabela Fonseca Aleixo, Anna Martins Moraes, Sabrina Garcia, Raffaello Di Ponzio, Erick Oblitas Mendoza, Bárbara Brum, Jéssica Schmeisk Rosa, Amanda L. Cordeiro, Bruno Takeshi Tanaka Portela, Gyovanni Ribeiro, Sara Deambrozi Coelho, Sheila Trierveiler de Souza, Lara Siebert Silva, Felipe Antonieto, Maria Pires, Ana Cláudia Salomão, Ana Caroline Miron, Rafael L. de Assis, Tomas F. Domingues, Luiz E. O. C. Aragão, Patrick Meir, José Luis Camargo, Antonio Ocimar Manzi, Laszlo Nagy, Lina M. Mercado, Iain P. Hartley, Carlos Alberto Quesada
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引用次数: 32

Abstract

The productivity of rainforests growing on highly weathered tropical soils is expected to be limited by phosphorus availability1. Yet, controlled fertilization experiments have been unable to demonstrate a dominant role for phosphorus in controlling tropical forest net primary productivity. Recent syntheses have demonstrated that responses to nitrogen addition are as large as to phosphorus2, and adaptations to low phosphorus availability appear to enable net primary productivity to be maintained across major soil phosphorus gradients3. Thus, the extent to which phosphorus availability limits tropical forest productivity is highly uncertain. The majority of the Amazonia, however, is characterized by soils that are more depleted in phosphorus than those in which most tropical fertilization experiments have taken place2. Thus, we established a phosphorus, nitrogen and base cation addition experiment in an old growth Amazon rainforest, with a low soil phosphorus content that is representative of approximately 60% of the Amazon basin. Here we show that net primary productivity increased exclusively with phosphorus addition. After 2 years, strong responses were observed in fine root (+29%) and canopy productivity (+19%), but not stem growth. The direct evidence of phosphorus limitation of net primary productivity suggests that phosphorus availability may restrict Amazon forest responses to CO2 fertilization4, with major implications for future carbon sequestration and forest resilience to climate change. Nutrient manipulation of low-phosphorus soil in an old growth Amazon rainforest shows that phosphorus availability drives forest productivity and is likely to limit the response to increasing atmospheric CO2 concentrations.

Abstract Image

亚马逊森林生产力受磷限制的直接证据
生长在风化严重的热带土壤上的热带雨林的生产力预计会受到磷可用性的限制1。然而,受控施肥实验却无法证明磷在控制热带雨林净初级生产力中的主导作用。最近的综合研究表明,对氮添加的反应与对磷添加的反应一样大2,对低磷可用性的适应似乎使净初级生产力在主要的土壤磷梯度上得以维持3。因此,磷的可用性在多大程度上限制了热带森林的生产力还很不确定。然而,亚马逊河流域大部分地区的土壤比大多数热带施肥实验的土壤更缺磷2。因此,我们在亚马逊流域约 60% 的土壤磷含量较低的亚马逊原始雨林中进行了磷、氮和碱式阳离子添加实验。实验结果表明,净初级生产力完全随着磷的添加而增加。两年后,细根(+29%)和树冠生产力(+19%)出现了强烈反应,但茎的生长却没有。磷限制净初级生产力的直接证据表明,磷的可用性可能会限制亚马逊森林对二氧化碳施肥的反应4,这对未来碳固存和森林抵御气候变化的能力有重大影响。对亚马逊古老热带雨林中低磷土壤的养分处理表明,磷的可用性驱动着森林生产力,并可能限制对大气中二氧化碳浓度增加的响应。
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来源期刊
Nature
Nature 综合性期刊-综合性期刊
CiteScore
90.00
自引率
1.20%
发文量
3652
审稿时长
3 months
期刊介绍: Nature is a prestigious international journal that publishes peer-reviewed research in various scientific and technological fields. The selection of articles is based on criteria such as originality, importance, interdisciplinary relevance, timeliness, accessibility, elegance, and surprising conclusions. In addition to showcasing significant scientific advances, Nature delivers rapid, authoritative, insightful news, and interpretation of current and upcoming trends impacting science, scientists, and the broader public. The journal serves a dual purpose: firstly, to promptly share noteworthy scientific advances and foster discussions among scientists, and secondly, to ensure the swift dissemination of scientific results globally, emphasizing their significance for knowledge, culture, and daily life.
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