היצוא הצליח — 

Leaf and soil nitrogen and phosphorus availability in a neotropical rain forest of nutrient-rich soil

 

שמור ב:
מידע ביבליוגרפי
מחבר: Martínez-Sánchez, José Luis
פורמט: artículo original
סטטוס:Versión publicada
Fecha de Publicación:2006
תיאור:The nitrogen and phosphorus supply in a lowland rain forest with a nutrient-rich soil was investigated by means of the leaf N/P quotient. It was hypothesised a high N and P supply to the forest ecosystem with a N and P rich soil. Total N and extractable P were determined in the surface (10 cm) soil of three plots of the forest. Total N was analysed by the Kjeldahl method, and P was extracted with HCl and NH4F. The leaf N/P quotient was evaluated from the senesced leaves of 11 dominant tree species from the mature forest. Samples of 5 g of freshly fallen leaves were collected from three trees of each species. Nitrogen was analysed by microkjeldahl digestion with sulphuric acid and distilled with boric acid, and phosphorus was analysed by digestion with nitric acid and perchloric acid, and determined by photometry. Concentrations of total N (0.50%, n = 30) and extract-able P (4.11 μg g-1, n = 30) in the soil were high. As expected, P supply was sufficient, but contrary to expected, N supply was low (N/P = 11.8, n = 11).
País:Portal de Revistas UCR
מוסד:Universidad de Costa Rica
Repositorio:Portal de Revistas UCR
שפה:Español
OAI Identifier:oai:portal.ucr.ac.cr:article/13875
גישה מקוונת:https://revistas.ucr.ac.cr/index.php/rbt/article/view/13875
מילת מפתח:cociente N/P
hojas seniles
Los Tuxtlas
México
selva húmeda tropical