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| Titre : |
Asymbiotic nitrogen fixation and soil metabolism in three Ontario forests
|
| Titre de série : | Soil Biologyy and Biochemistry, Vol 22 - n°7 |
| Auteur(s) : | O.Q Hendrickson, Auteur (et co-auteur) |
| Type de document : | Tiré à part |
| Sujets : | Ontario ; Pinus banksiana ; Minéralisation de l'azote |
| Résumé : |
Field and laboratory incubations were used to assess nitrogenase (acetylene reduction) activity, nitrogen mineralization and respiration in three mature forests in the northern hardwoods—boreal transition zone of eastern North America. A 66-yr-old jack pine (Pinus banksiana Lamb.) forest had 45.41 ha−1 of forest floor, ca 33% more than older mixedwood and hardwood forests in the same vicinity. Jack pine forest floor was more acid, mineralized only one-third as much N and half as much C during laboratory incubations, had little or no nitrogenase activity on eight sampling dates during the growing season, and contained 40- to 70-fold lower numbers of N2-fixing bacteria. Low nutrient turnover in older jack pine stands may result in buildup of surface organic horizons and declining tree g[...] Field and laboratory incubations were used to assess nitrogenase (acetylene reduction) activity, nitrogen mineralization and respiration in three mature forests in the northern hardwoods—boreal transition zone of eastern North America. A 66-yr-old jack pine (Pinus banksiana Lamb.) forest had 45.41 ha−1 of forest floor, ca 33% more than older mixedwood and hardwood forests in the same vicinity. Jack pine forest floor was more acid, mineralized only one-third as much N and half as much C during laboratory incubations, had little or no nitrogenase activity on eight sampling dates during the growing season, and contained 40- to 70-fold lower numbers of N2-fixing bacteria. Low nutrient turnover in older jack pine stands may result in buildup of surface organic horizons and declining tree growth. At the moister hardwood site, temperature variations largely accounted for seasonal trends in C2H2 reduction: activity at the drier mixedwood site increased following rainfall events. Although asymbiotic N2 fixation in surface soils is a small N input ( |
| Date de publication : | 1990 |
| Format : | pp. 967-971 / graph., tabl., réf. |
| Langue(s) : | Anglais |
| Lien vers la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=147210 |
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| Localisation | Emplacement | Pôle | Section | Cote | Support | Disponibilité |
|---|---|---|---|---|---|---|
| Kourou | Archives | AgroParisTech-Kourou | TP5214 | Papier Périodique | Empruntable Disponible |