visitant ::
identificació
|
|||||||||||||||
Cerca | Lliura | Ajuda | Servei de Biblioteques | Sobre el DDD | Català English Español |
Pàgina inicial > Articles > Articles publicats > Potassium : |
Data: | 2015 |
Resum: | Aim: Potassium (K) is the second most abundant nutrient after nitrogen (N) in plant photosynthetic tissues. Thousands of physiological and metabolic studies in recent decades have established the fundamental role of K in plant function, especially in water use efficiency and economy, and yet macroecological studies have mostly overlooked this nutrient. - Methods: We have reviewed available studies on the contents, stoichiometries and roles of potassium in the soil-plant system and in terrestrial ecosystems. We have also reviewed the impacts of global change drivers on K contents, stoichiometries, and roles. - Conclusions: The current literature indicates that K, at a global level, is as limiting as N and phosphorus (P) for plant productivity in terrestrial ecosystems. K limitation has been seen up to some degree in 70% of all studied terrestrial ecosystems. However, atmospheric K deposition from human activities represents higher amounts than that from natural sources in some areas. We are far from understanding the K fluxes between the atmosphere and land, and the role of anthropogenic activities in these fluxes. The increasing aridity expected in wide areas of the world makes K more critical through its role in water use efficiency. N deposition exerts a strong impact on the ecosystem K-cycle, decreasing K availability and increasing K limitation. Plant invasive success is enhanced by higher soil K availability, especially in environments without strong abiotic stresses. The impacts of other global change drivers, such as increasing atmospheric CO² or changes in land use remain to be elucidated. Current models of the responses of ecosystems and carbon storage to projected global climatic and atmospheric changes are now starting to consider N and P, but they should also consider K, mostly in arid and semiarid ecosystems. |
Ajuts: | European Commission 610028 Ministerio de Economía y Competitividad CGL2013-48074-P |
Nota: | L'article inclou sis apèndixs |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió sotmesa a revisió |
Matèria: | Climate change ; Drought ; Ecological stoichiometry ; Eutrophication ; Global change ; Invasiveness ; N:K ; Plant growth |
Publicat a: | Global ecology and biogeography, Vol. 24 Issue 3 (March 2015) , p. 261-275, ISSN 1466-822X |
Post-print 44 p, 416.5 KB |
Annex 1 2 p, 42.7 KB |
Annex 2 3 p, 61.3 KB |
Annex 3 1 p, 34.2 KB |
Annex 4 2 p, 62.9 KB |
Annex 5 2 p, 55.1 KB |
Annex 6 9 p, 95.9 KB |