Direct evidence for phosphorus limitation on Amazon forest productivity

The productivity of rainforests growing on highly weathered tropical soils is expected to be limited by phosphorus availability 1 . Yet, controlled fertilization experiments have been unable to demonstrate a dominant role for phosphorus in controlling tropical forest net primary productivity. Recent...

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Vydáno v:	Nature (London) Ročník 608; číslo 7923; s. 558 - 562
Hlavní autoři:	Cunha, Hellen Fernanda Viana, Andersen, Kelly M., Lugli, Laynara Figueiredo, Santana, Flavia Delgado, Aleixo, Izabela Fonseca, Moraes, Anna Martins, Garcia, Sabrina, Di Ponzio, Raffaello, Mendoza, Erick Oblitas, Brum, Bárbara, Rosa, Jéssica Schmeisk, Cordeiro, Amanda L., Portela, Bruno Takeshi Tanaka, Ribeiro, Gyovanni, Coelho, Sara Deambrozi, de Souza, Sheila Trierveiler, Silva, Lara Siebert, Antonieto, Felipe, Pires, Maria, Salomão, Ana Cláudia, Miron, Ana Caroline, de Assis, Rafael L., Domingues, Tomas F., Aragão, Luiz E. O. C., Meir, Patrick, Camargo, José Luis, Manzi, Antonio Ocimar, Nagy, Laszlo, Mercado, Lina M., Hartley, Iain P., Quesada, Carlos Alberto
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	London Nature Publishing Group UK 18.08.2022 Nature Publishing Group
Témata:	631/158/2450 704/47/4113 Acclimatization Adaptation Availability Carbon Carbon dioxide Carbon Dioxide - metabolism Carbon Dioxide - pharmacology Carbon Sequestration Cations - metabolism Cations - pharmacology Climate change Climate Change - statistics & numerical data Experiments Fertilization Forest productivity Forests Humanities and Social Sciences Models, Biological multidisciplinary Net Primary Productivity Nitrogen Nitrogen - metabolism Nitrogen - pharmacology Old growth Phosphorus Phosphorus - metabolism Phosphorus - pharmacology Phosphorus content Productivity Rainforest Rainforests Science Science (multidisciplinary) Soil - chemistry Soil fertility Trees - drug effects Trees - metabolism Tropical Climate Tropical environments Tropical forests Tropical soils Uncertainty
ISSN:	0028-0836, 1476-4687, 1476-4687
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Shrnutí:	The productivity of rainforests growing on highly weathered tropical soils is expected to be limited by phosphorus availability 1 . 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 phosphorus 2 , and adaptations to low phosphorus availability appear to enable net primary productivity to be maintained across major soil phosphorus gradients 3 . 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 place 2 . 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 CO 2 fertilization 4 , 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 CO 2 concentrations.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0028-0836 1476-4687 1476-4687
DOI:	10.1038/s41586-022-05085-2