Does nitrogen availability have greater control over the formation of tropical heath forests than water stress? A hypothesis based on nitrogen isotope ratios



Document title: Does nitrogen availability have greater control over the formation of tropical heath forests than water stress? A hypothesis based on nitrogen isotope ratios
Journal: Acta amazonica
Database: PERIÓDICA
System number: 000342431
ISSN: 0044-5967
Authors:
1
2
Institutions: 1University of California, Berkeley, California. Estados Unidos de América
Year:
Season: Dic
Volumen: 41
Number: 4
Pages: 589-592
Country: Brasil
Language: Inglés
Document type: Nota breve o noticia
Approach: Descriptivo
English abstract Global scale analyses of soil and foliage δ15N have found positive relationships between δ15N and ecosystem N loss (suggesting an open N cycle) and a negative relationship between δ15N and water availability. We show here that soils and leaves from tropical heath forests are depleted in 15N relative to 'typical' forests suggesting that they have a tight N cycle and are therefore limited by N rather than by, often suggested, water availability
Portuguese abstract Análises de δ15N solo e foliar, em escala global, encontraram relações positivas entre δ15N e a perda de N do ecossistema (sugerindo um ciclo aberto de N), e uma relação negativa entre o δ15N e a disponibilidade de água. Mostramosneste trabalho que os solos e a vegetação de florestas de campinarana são empobrecidas em 15N em relação a florestas 'típicas', sugerindo que elas têm um ciclo fechado de N e são, desta forma, limitadas pelo N, ao invés da disponibilidade de água, como frequentemente sugerido
Disciplines: Biología,
Geociencias
Keyword: Ecología,
Ciencias de la atmósfera,
Bosques tropicales,
Nitrógeno,
Disponibilidad,
Estrés hídrico,
Isótopos,
Suelos ácidos,
Oxido nitroso
Keyword: Biology,
Earth sciences,
Ecology,
Atmospheric sciences,
Tropical forests,
Nitrogen,
Availability,
Water stress,
Isotopes,
Acid soils,
Nitrous oxide
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