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

Acta Amazonica

Francis Q Brearley²  Paul V. A Fine¹  Kristel Perreijn¹ 

[1] ,University of Dublin Trinity College

关键词: acid soils;    kerangas;    nitrous oxide;    stable isotopes;    solos ácidos;    campinarana;    óxido nitroso;    isótopos estáveis;   

DOI  :  10.1590/S0044-59672011000400017

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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