Successional changes in soil nitrogen availability, non-symbiotic nitrogen fixation and carbon/nitrogen ratios in southern Chilean forest ecosystems. Pérez, C., A., Carmona, M., R., Aravena, J., C., & Armesto, J., J. Oecologia, 140(4):617-625-625, Springer Berlin / Heidelberg, 8, 2004. ![Successional changes in soil nitrogen availability, non-symbiotic nitrogen fixation and carbon/nitrogen ratios in southern Chilean forest ecosystems [link]](https://bibbase.org/img/filetypes/link.svg "link")
Website abstract bibtex Vast areas of southern Chile are now covered by second-growth forests because of fire and logging. To study successional patterns after moderate-intensity, anthropogenic fire disturbance, we assessed differences in soil properties and N fluxes across a chronosequence of seven successional stands (2â130Â years old). We examined current predictions of successional theory concerning changes in the N cycle in forest ecosystems. Seasonal fluctuations of net N mineralization (N min) in surface soil and N availability (N a; N a=NH 4 + âN+NO 3 â âN) in upper and deep soil horizons were positively correlated with monthly precipitation. In accordance with theoretical predictions, stand age was positively, but weakly related to both N a ( r 2=0.282, Ptot; r 2=0.192, Pr 2=0.187, Pmin (upper plus deep soil horizons) was found across the chronosequence ( r 2=0.124, Pmin occurred at modest rates in early successional stands, suggesting that soil disturbance did not impair microbial processes. The relationship between N fixation (N fix) in the litter layer and stand age best fitted a quadratic model ( r 2=0.228, Pfix in the litter layer is a steady N input to unpolluted southern temperate forests during mid and late succession, which may compensate for hydrological losses of organic N from old-growth ecosystems.
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title = {Successional changes in soil nitrogen availability, non-symbiotic nitrogen fixation and carbon/nitrogen ratios in southern Chilean forest ecosystems},
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abstract = {Vast areas of southern Chile are now covered by second-growth forests because of fire and logging. To study successional patterns after moderate-intensity, anthropogenic fire disturbance, we assessed differences in soil properties and N fluxes across a chronosequence of seven successional stands (2â130Â years old). We examined current predictions of successional theory concerning changes in the N cycle in forest ecosystems. Seasonal fluctuations of net N mineralization (N min) in surface soil and N availability (N a; N a=NH 4 + âN+NO 3 â âN) in upper and deep soil horizons were positively correlated with monthly precipitation. In accordance with theoretical predictions, stand age was positively, but weakly related to both N a ( r 2=0.282, Ptot; r 2=0.192, Pr 2=0.187, Pmin (upper plus deep soil horizons) was found across the chronosequence ( r 2=0.124, Pmin occurred at modest rates in early successional stands, suggesting that soil disturbance did not impair microbial processes. The relationship between N fixation (N fix) in the litter layer and stand age best fitted a quadratic model ( r 2=0.228, Pfix in the litter layer is a steady N input to unpolluted southern temperate forests during mid and late succession, which may compensate for hydrological losses of organic N from old-growth ecosystems.},
bibtype = {article},
author = {Pérez, C A and Carmona, M R and Aravena, J C and Armesto, J J},
journal = {Oecologia},
number = {4}
}
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